Anritsu 681XXC Portable Generator User Manual

SERIES
681XXC
SYNTHESIZED SIGNAL GENERATOR
OPERATION MANUAL
490 JARVIS DRIVE
MORGAN HILL, CA 95037-2809
P/N: 10370-10333
REVISION: B
PRINTED: APRIL 2001
COPYRIGHT 1999 ANRITSU CO.
WARRANTY
The Anritsu product(s) listed on the title page is (are) warranted against defects in materials and
workmanship for one year from the date of shipment.
Anritsu’s obligation covers repairing or replacing products which prove to be defective during the
warranty period. Buyers shall prepay transportation charges for equipment returned to Anritsu for
warranty repairs. Obligation is limited to the original purchaser. Anritsu is not liable for consequential damages.
LIMITATION OF WARRANTY
The foregoing warranty does not apply to Anritsu connectors that have failed due to normal wear.
Also, the warranty does not apply to defects resulting from improper or inadequate maintenance by
the Buyer, unauthorized modification or misuse, or operation outside of the environmental specifications of the product. No other warranty is expressed or implied, and the remedies provided herein
are the Buyer’s sole and exclusive remedies.
TRADEMARK ACKNOWLEDGEMENTS
Adobe Acrobat is a registered trademark of Adobe Systems Incorporated.
NOTICE
Anritsu Company has prepared this manual for use by Anritsu Company personnel and customers
as a guide for the proper installation, operation, and maintenance of Anritsu Company equipment
and computor programs. The drawings, specifications, and information contained herein are the
property of Anritsu Company, and any unauthorized use or disclosure of these drawings, specifications, and information is prohibited; they shall not be reproduced, copied, or used in whole or in part
as the basis for manufacture or sale of the equipment or software programs without the prior writtten consent of Anritsu Company.
Safety Symbols
To prevent the risk of personal injury or loss related to equipment malfunction, Anritsu Company uses the
following symbols to indicate safety-related information. For your own safety, please read the information
carefully BEFORE operating the equipment.
WARNING
WARNING indicates a hazard. It calls attention to a procedure that
could result in personal injury or loss of life if not performed properly.
Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.
CAUTION
CAUTION indicates a hazard. It calls attention to a procedure which,
if not performed properly, could result in damage to or destruction of a
component of the instrument. Do not proceed beyond a CAUTION note
until the indicated conditions are fully understood and met.
The instrument is marked with this symbol to indicate that it is necessary for the user to refer to the instructions in the operation manual.
Indicates ground.
Indicates heavy weight equipment.
681XXC OM
Safety-1
For Safety
WARNING
When supplying power to this equipment, always use a
three-wire power cable connected to a three-wire power line
outlet. If power is supplied without grounding the equipment in this manner, there is a risk of receiving a severe or
fatal electric shock.
WARNING
Before changing the fuse, always remove the power cord
from the power outlet. There is the risk of receiving a fatal
electric shock if the fuse is replaced with the power cord
connected.
Always use a new fuse of the type and rating specified by
the fuse markings on the rear panel of the instrument.
WARNING
There are no operator serviceable components inside. Refer
servicing of the instrument to qualified service technicians.
To prevent the risk of electrical shock or damage to precision
components, do not remove the equipment covers.
WARNING
Use two or more people to lift and move this equipment, or
use an equipment cart. There is a risk of back injury, if this
equipment is lifted by one person.
WARNING
If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment
may be impaired.
Safety-2
681XXC OM
Table of Contents
Chapter 1 General Information
1-1
SCOPE OF MANUAL . . . . . . . . . . . . . . . . . 1-3
1-2
INTRODUCTION . . . . . . . . . . . . . . . . . . . 1-3
1-3
DESCRIPTION . . . . . . . . . . . . . . . . . . . . 1-3
1-4
IDENTIFICATION NUMBER . . . . . . . . . . . . 1-5
1-5
ELECTRONIC MANUAL . . . . . . . . . . . . . . . 1-5
1-6
RELATED MANUALS . . . . . .
GPIB Programming Manual . .
SCPI Programming Manual . .
Maintenance Manual . . . . .
1-7
OPTIONS . . . . . . . . . . . . . . . . . . . . . . . 1-6
1-8
PERFORMANCE SPECIFICATIONS . . . . . . . . 1-7
1-9
RECOMMENDED TEST EQUIPMENT . . . . . . . 1-8
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1-5
1-5
1-5
1-6
Chapter 2 Installation
2-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 2-3
2-2
INITIAL INSPECTION . . . . . . . . . . . . . . . . 2-3
2-3
PREPARATION FOR USE
Power Requirements . . .
Line Voltage Selection . .
Power Connection . . . .
Standby Operation. . . .
Warmup Time . . . . . .
Operating Environment .
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2-4
2-4
2-4
2-4
2-5
2-6
2-6
2-4
GPIB SETUP AND INTERCONNECTION . . .
Interface Connector . . . . . . . . . . . . .
Cable Length Restrictions . . . . . . . . . .
GPIB Interconnection . . . . . . . . . . . .
Setting the GPIB Address . . . . . . . . . .
Selecting the Line Terminator . . . . . . . .
Selecting the Interface Language. . . . . . .
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2-7
2-7
2-7
2-7
2-7
2-9
2-9
2-5
RACK MOUNTING KIT INSTALLATION . . . . . 2-10
Preliminary . . . . . . . . . . . . . . . . . . 2-10
Procedure . . . . . . . . . . . . . . . . . . . 2-10
681XXC OM
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i
Table of Contents (Continued)
2-6
PREPARATION FOR STORAGE/SHIPMENT . . . 2-13
Preparation for Storage . . . . . . . . . . . . . 2-13
Preparation for Shipment . . . . . . . . . . . . 2-13
Chapter 3 Local (Front Panel) Operation
ii
3-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 3-5
3-2
FRONT PANEL LAYOUT.
Line Key . . . . . . . .
Data Display Area . . . .
Data Entry Area . . . . .
RF Output Control Key .
Connectors . . . . . . .
3-3
DATA DISPLAY AREA . . . . . . . . . . . . . . . . 3-8
Menu Display Format . . . . . . . . . . . . . . 3-9
Menu Keys . . . . . . . . . . . . . . . . . . . 3-10
3-4
DATA ENTRY AREA. . . . . . . . . . . . . . . . . 3-12
3-5
INSTRUMENT START-UP . . . .
Powering Up the 681XXC . . . .
Start-Up Display . . . . . . . .
Standby Operation . . . . . . .
Self-Testing the 681XXC . . . .
Resetting to Default Parameters
3-10
POWER LEVEL SWEEP OPERATION. . . . . . . 3-53
Selecting CW Power Sweep Mode . . . . . . . . 3-53
Setting CW Power Sweep Step Size and Dwell Time3-54
Selecting a CW Power Sweep Trigger . . . . . . 3-55
Selecting a Power Level Sweep Range. . . . . . 3-56
Selecting a Sweep Frequency/Step Power Mode . 3-58
Setting Power Level Step Size . . . . . . . . . 3-59
3-11
LEVELING OPERATIONS . . . . . . . . . . .
Selecting a Leveling Mode . . . . . . . . .
Attenuator Decoupling . . . . . . . . . . .
ALC Power Slope . . . . . . . . . . . . . .
User Cal (User Level Flatness Correction) .
3-12
SIGNAL MODULATION . . . . . . . . . . . . . . 3-73
Amplitude Modulation Operating Modes . . . . 3-73
Providing Amplitude Modulation . . . . . . . . 3-73
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3-6
3-6
3-6
3-7
3-7
3-7
3-14
3-14
3-14
3-14
3-15
3-15
3-60
3-60
3-64
3-65
3-67
681XXC OM
Table of Contents (Continued)
Frequency Modulation Operating Modes .
Providing Frequency Modulation . . . . .
Square Wave Modulation Operating Modes
Providing Square Wave Modulation . . . .
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3-74
3-75
3-77
3-77
3-13
SYSTEM CONFIGURATION . .
Configuring the Front Panel .
Configuring the Rear Panel . .
Configuring the RF . . . . . .
Configuring the GPIB . . . .
Setting Increment Sizes . . .
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3-80
3-81
3-82
3-83
3-85
3-88
3-14
SAVING/RECALLING INSTRUMENT SETUPS
Saving Setups . . . . . . . . . . . . . . . .
Recalling Setups . . . . . . . . . . . . . . .
Erasing Stored Setups . . . . . . . . . . . .
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3-89
3-89
3-89
3-90
3-15
SECURE OPERATION . . . . . . . . . . . . . . . 3-91
3-16
REFERENCE OSCILLATOR CALIBRATION . . . 3-92
Chapter 4 Local Operation–Menu Maps
4-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 4-3
4-2
MENU MAP DESCRIPTION . . . . . . . . . . . . . 4-3
Chapter 5 Operation Verification
5-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 5-3
5-2
TEST EQUIPMENT. . . . . . . . . . . . . . . . . . 5-3
5-3
TEST RECORDS . . . . . . . . . . . . . . . . . . . 5-3
5-4
INITIAL 681XXC CHECKOUT. .
Power Up . . . . . . . . . . .
Self Test . . . . . . . . . . . .
Resetting the 681XXC . . . . .
Warmup Time . . . . . . . . .
5-5
CW FREQUENCY ACCURACY TEST . . . . . . . . 5-5
Test Setup . . . . . . . . . . . . . . . . . . . . 5-5
Test Procedure. . . . . . . . . . . . . . . . . . 5-6
5-6
POWER LEVEL ACCURACY AND FLATNESS
TESTS . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Test Setup . . . . . . . . . . . . . . . . . . . 5-13
681XXC OM
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5-4
5-4
5-4
5-4
5-4
iii
Table of Contents (Continued)
Power Level Accuracy Test Procedure . . . . . . 5-14
Power Level Flatness Test Procedure . . . . . . 5-15
Chapter 6 Operator Maintenance
6-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 6-3
6-2
ERROR AND WARNING/STATUS MESSAGES. . . 6-3
Self-Test Error Messages. . . . . . . . . . . . . 6-3
Normal Operation Error and Warning/ Status
Messages . . . . . . . . . . . . . . . . . . . . 6-8
6-3
TROUBLESHOOTING . . . . . . . . . . . . . . . 6-10
6-4
ROUTINE MAINTENANCE
Cleaning the Fan Filter. .
Cleaning the Data Display
Replacing the Line Fuse .
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6-13
6-13
6-13
6-14
Chapter 7 Use With Other Instruments
7-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 7-3
7-2
MASTER-SLAVE OPERATION . . . .
Connecting the Instruments . . . . .
Initiating Master-Slave Operation . .
Master-Slave Operation . . . . . . .
Master-Slave Operation in VNA Mode
Terminating Master-Slave Operation .
7-3
USE WITH A 56100A SCALAR NETWORK
ANALYZER. . . . . . . . . . . . . . . . . . . . . . 7-10
Connecting the 681XXC to the 56100A . . . . . 7-10
7-4
USE WITH A 360B VECTOR NETWORK
ANALYZER . . . . . . . . . . . . . . . . . . . . .
Connecting the 681XXC to the 360B . . . . .
Modes of Operation . . . . . . . . . . . . . .
Source Lock Mode . . . . . . . . . . . . . .
Tracking Mode . . . . . . . . . . . . . . . .
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7-11
7-11
7-12
7-12
7-14
USE WITH A HP8757D SCALAR NETWORK
ANALYZER. . . . . . . . . . . . . . . . . . . .
Connecting the 681XXC to the HP8757D . .
Setting Up the 681XXC . . . . . . . . . . .
Initiating HP8757D SNA Operation . . . . .
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7-16
7-16
7-17
7-19
7-5
iv
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7-4
7-4
7-5
7-7
7-7
7-9
681XXC OM
Table of Contents (Continued)
Appendix A Rear Panel Connectors
A-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . A-1
A-2
REAR PANEL CONNECTORS . . . . . . . . . . . A-1
A-3
CONNECTOR PINOUT DIAGRAMS . . . . . . . . A-1
Appendix B Performance Specifications
681XXC OM
v/vi
Table of Contents (Continued)
Chapter 1
General Information
Table of Contents
1-1
SCOPE OF MANUAL . . . . . . . . . . . . . . . . . 1-3
1-2
INTRODUCTION . . . . . . . . . . . . . . . . . . . 1-3
1-3
DESCRIPTION . . . . . . . . . . . . . . . . . . . . 1-3
1-4
IDENTIFICATION NUMBER . . . . . . . . . . . . 1-5
1-5
ELECTRONIC MANUAL . . . . . . . . . . . . . . . 1-5
1-6
RELATED MANUALS . . . . . .
GPIB Programming Manual . .
SCPI Programming Manual . .
Maintenance Manual . . . . .
1-7
OPTIONS . . . . . . . . . . . . . . . . . . . . . . . 1-6
1-8
PERFORMANCE SPECIFICATIONS . . . . . . . . 1-7
1-9
RECOMMENDED TEST EQUIPMENT . . . . . . . 1-7
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1-5
1-5
1-5
1-6
Figure 1-1.
Series 681XXC Synthesized Signal Generator
Chapter 1
General Information
1-1
SCOPE OF MANUAL
This manual provides general information, installation, and operating
information for the Anritsu Series 681XXC Synthesized Signal Generator. (Throughout this manual, the terms 681XXC and signal generator will be used interchangeably to refer to the instrument.) Manual organization is shown in the table of contents.
1-2
INTRODUCTION
This chapter contains general information about the series 681XXC
signal generators. It includes a general description of the instrument
and information on its identification number, related manuals, options, and performance specifications. A listing of recommended test
equipment is also provided.
1-3
DESCRIPTION
The Series 681XXC Synthesized Signal Generators are microprocessor-based, synthesized signal sources with high resolution phase-lock
capability. They generate both broad (full range) and narrow band
sweeps and discrete CW frequencies across the frequency range of
10 MHz to 65 GHz. All functions of the signal generator are fully controllable locally from the front panel or remotely (except for power
on/standby) via the IEEE-488 General Purpose Interface Bus (GPIB).
The series presently consists of seven models covering a variety of frequency and power ranges. Table 1-1, page 1-4, lists models, frequency
ranges, and maximum leveled output.
681XXC OM
1-3
GENERAL
INFORMATION
Table 1-1.
681XXC
MODELS
Series 681XXC Models
681XXC
Model
Frequency
Output Power
Output Power
w/Step Attenuator
Output Power
w/Electronic
Step Attenuator
68117C
0.01 – 8.4 GHz
+13.0 dBm
+11.0 dBm
+9.0 dBm
68137C
2.0 – 20.0 GHz
+13.0 dBm
+11.0 dBm
+3.0 dBm
68147C
0.01 – 20.0 GHz
+13.0 dBm
+11.0 dBm
+3.0 dBm
68167C
0.01 – 2.0 GHz
2.0 – 20.0 GHz
20.0 – 40.0 GHz
+13.0 dBm
+9.0 dBm
+6.0 dBm
+11.0 dBm
+7.0 dBm
+3.0 dBm
Not Available
68177C
0.01 – 2.0 GHz
2.0 – 20.0 GHz
20.0 – 40.0 GHz
40.0 – 50.0 GHz
+11.0 dBm
+10.0 dBm
+2.5 dBm
+2.5 dBm
+10.0 dBm
+8.5 dBm
0.0 dBm
–1.0 dBm
Not Available
68187C
0.01 – 2.0 GHz
2.0 – 20.0 GHz
20.0 – 40.0 GHz
40.0 – 50.0 GHz
50.0 – 60.0 GHz
+11.0 dBm
+10.0 dBm
+2.5 dBm
+2.0 dBm
+2.0 dBm
+10.0 dBm
+8.5 dBm
0.0 dBm
–1.5 dBm
–2.0 dBm
Not Available
68197C
0.01 – 2.0 GHz
2.0 – 20.0 GHz
20.0 – 40.0 GHz
40.0 – 50.0 GHz
50.0 — 65.0 GHz
+11.0 dBm
+10.0 dBm
+2.5 dBm
0.0 dBm
–2.0 dBm
Not Available
Not Available
With Option 15A (High Power) Installed
68117C
0.01 – 2.0 GHz
2.0 – 8.4 GHz
+13.0 dBm
+17.0 dBm
+11.0 dBm
+15.0 dBm
+11.0 dBm
+11.0 dBm
68137C
2.0 – 20.0 GHz
+17.0 dBm
+15.0 dBm
+7.0 dBm
68147C
0.01 – 2.0 GHz
2.0 – 20.0 GHz
+13.0 dBm
+17.0 dBm
+11.0 dBm
+15.0 dBm
+11.0 dBm
+7.0 dBm
68167C
0.01 – 20.0 GHz
20.0 – 40.0 GHz
+13.0 dBm
+6.0 dBm
+11.0 dBm
+3.0 dBm
Not Available
68177C
0.01 – 50.0 GHz
Standard
Standard
Not Available
68187C
0.01 – 60.0 GHz
Standard
Standard
Not Available
Note: In models with Option 22 that have a high-end frequency of £20 GHz, rated output power is reduced by 1 dB
In models with Option 22 that have a high-end frequency of >20 GHz, rated output power is reduced by 2 dB.
1-4
681XXC OM
GENERAL
INFORMATION
1-4
IDENTIFICATION
NUMBER
IDENTIFICATION
NUMBER
All Anritsu instruments are assigned a unique six-digit ID number,
such as “875012”. The ID number is imprinted on a decal that is affixed to the rear panel of the unit. Special-order instrument configurations also have an additional special serial number tag attached to the
rear panel of the unit.
When ordering parts or corresponding with Anritsu Customer Service,
please use the correct serial number with reference to the specific instrument’s model number (i.e., Model 68147C Synthesized Signal Generator, Serial No. 875012).
1-5
ELECTRONIC MANUAL
This manual is available on CD ROM as an Adobe Acrobat Portable
Document Format (*.pdf) file. The file can be viewed using Acrobat
Reader, a free program that is also included on the CD ROM. The file
is “linked” such that the viewer can choose a topic to view from the
displayed “bookmark” list and “jump” to the manual page on which the
topic resides. The text can also be word-searched. Contact Anritsu
Customer Service for price and availability.
1-6
RELATED MANUALS
This is one of a four manual set that consists of an Operation Manual,
a GPIB Programming Manual, a SCPI Programming Manual, and a
Maintenance Manual.
681XXC OM
GPIB Programming
Manual
This manual provides information for remote operation of the signal generator with 681XXC Product
Specific commands sent from an external controller
via the IEEE 488 General Purpose Interface Bus
(GPIB). It contains a general description of the
GPIB and bus data transfer and control functions, a
complete listing and description of all 681XXC GPIB
Product Specific commands, and several programming examples. The Anritsu part number for the
GPIB Programming Manual is 10370-10334.
SCPI Programming
Manual
This manual provides information for remote operation of the signal generator with Standard Commands for Programmable Instruments (SCPI)
commands sent from an external controller via the
IEEE 488 General Purpose Interface Bus (GPIB). It
contains a general description of the GPIB and bus
data transfer and control functions, a complete listing and description of each command in the 681XXC
SCPI command set, and examples of command usage. The Anritsu part number for the SCPI Programming Manual is 10370-10335.
1-5
GENERAL
INFORMATION
OPTIONS
Maintenance
Manual
1-7
OPTIONS
The Maintenance Manual supplies service information for all models in the 681XXC series. The service
information includes functional circuit descriptions,
block diagrams, performance verification tests, calibration procedures, troubleshooting data, and assembly and component removal/replacement
procedures. The Anritsu part number for the Maintenance Manual is 10370-10336.
The following options are available.
Option 1, Rack Mounting. Rack mount kit containing a set of
track slides (90° tilt capability), mounting ears, and front panel handles for mounting the instrument in a standard 19-inch equipment
rack.
Option 2A, 110 dB Step Attenuator. Adds a 10 dB per step
attenuator with a 110 dB range for models having a high-end frequency of £20 GHz. Output power is selected directly in dBm on the
front panel (or via GPIB). Rated RF output power is reduced.
Option 2B, 110 dB Step Attenuator. Adds a 10 dB per step
attenuator with a 110 dB range for models having a high-end frequency of £40 GHz. Output power is selected directly in dBm on the
front panel (or via GPIB). Rated RF output power is reduced.
Option 2C, 90 dB Step Attenuator. Adds a 10 dB per step
attenuator with a 90 dB range for models having a high-end frequency of £50 GHz. Output power is selected directly in dBm on the
front panel (or via GPIB). Rated RF output power is reduced.
Option 2D, 90 dB Step Attenuator. Adds a 10 dB per step
attenuator with a 90 dB range for models having a high-end frequency of £60 GHz. Output power is selected directly in dBm on the
front panel (or via GPIB). Rated RF output power is reduced.
Option 2E, 120 dB Electronic Step Attenuator. Adds a 10 dB
per step electronic attenuator with a 120 dB range for models having a high-end frequency of £8.4 GHz. Output power is selected directly in dBm on the front panel (or via GPIB). Rated RF output
power is reduced.
Option 2F, 120 dB Electronic Step Attenuator. Adds a 10 dB
per step electronic attenuator with a 120 dB range for models having a high-end frequency of £20 GHz. Output power is selected directly in dBm on the front panel (or via GPIB). Rated RF output
power is reduced.
Option 9, Rear Panel RF Output. Moves the RF output connector
to the rear panel.
Option 11, 0.1 Hz Frequency Resolution. Provides frequency
resolution of 0.1 Hz.
1-6
681XXC OM
GENERAL
INFORMATION
PERFORMANCE
SPECIFICATIONS
Option 14, Rack Mounting without Chassis Slides. Modifies
rack mounting hardware to install unit in a console that has mounting shelves. Includes mounting ears and front panel handles.
Option 15A, High Power Output. Adds high-power RF components to the instrument providing increased RF output power in the
2–20 GHz frequency range. Option 15A is standard in models having a high-end frequency that is >40 GHz.
Option 16, High-Stability Time Base. Adds an ovenized, 10 MHz
crystal oscillator with <5 x 10–10/day frequency stability.
Option 17A, No Front Panel. Deletes the front panel for use in remote control applications where a front panel display or keyboard
control are not needed.
Option 18, mmWave Module Bias Output. Provides bias output
for 54000-xWRxx Millimeter Wave Source Modules. BNC Twinax
connector, rear panel.
Option 19, SCPI Programmability. Adds GPIB command mnemonics complying with Standard Commands for Programmable Instruments (SCPI), Version 1993.0. SCPI programming complies with
IEEE 488.2-1987.
Option 22, 0.1 Hz to 10 MHz Audio Frequency. Adds frequency
coverage below 10 MHz. In models having a high-end frequency of
£20 GHz, rated output power is reduced by 1 dB; in models having a
high-end frequency of >20 GHz, rated output power is reduced by
2 dB.
1-8
PERFORMANCE
SPECIFICATIONS
681XXC OM
Series 681XXC Synthesized Signal Generator performance specifications are provided in Appendix B.
1-7
GENERAL
INFORMATION
1-9
RECOMMENDED TEST
EQUIPMENT
RECOMMENDED
TEST EQUIPMENT
Table 1-2 lists the recommended test equipment for performing the Series 681XXC Synthesized Signal Generator operation verification tests
in Chapter 5.
Table 1-2.
Recommended Test Equipment
Instrument
1-8
Critical Specification
Recommended Manufacturer/Model
Frequency
Counter,
with
Cable Kit
and
External Mixer
Range: 0.01 to 65 GHz
Input Z: 50W
Resolution: 1 Hz
Other: External Time Base
Input
EIP Microwave, Inc. Models 538B,
548B, or 578B,
with
Cable Kit: Option 590
and
External Mixer:
Option 91 (26.5 to 40 GHz)
Option 92 (40 to 60 GHz)
Option 93 (60 to 90 GHz)
Power Meter,
with
Power
Sensors
Range: –30 to +20 dBm
(1 mW to 100 mW)
Anritsu Model ML2437A or ML2438A,
with
Power Sensors:
MA2474A (0.01 to 40 GHz)
MA2475A (0.01 to 50 GHz)
Oscilloscope
Bandwidth: DC to 150 MHz
Vertical Sensitivity: 2 mV/
division
Horiz Sensitivity: 50 ns/
division
Tektronix, Inc. Model TAS485
681XXC OM
Chapter 2
Installation
Table of Contents
2-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 2-3
2-2
INITIAL INSPECTION . . . . . . . . . . . . . . . . 2-3
2-3
PREPARATION FOR USE
Power Requirements . . .
Line Voltage Selection . .
Power Connection . . . .
Standby Operation. . . .
Warmup Time . . . . . .
Operating Environment .
. . . .
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2-4
2-4
2-4
2-4
2-5
2-6
2-6
2-4
GPIB SETUP AND INTERCONNECTION . . .
Interface Connector . . . . . . . . . . . . .
Cable Length Restrictions . . . . . . . . . .
GPIB Interconnection . . . . . . . . . . . .
Setting the GPIB Address . . . . . . . . . .
Selecting the Line Terminator . . . . . . . .
Selecting the Interface Language. . . . . . .
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2-7
2-7
2-7
2-7
2-7
2-9
2-9
2-5
RACK MOUNTING KIT INSTALLATION . . . . . 2-10
Preliminary . . . . . . . . . . . . . . . . . . 2-10
Procedure . . . . . . . . . . . . . . . . . . . 2-10
2-6
PREPARATION FOR STORAGE/SHIPMENT . . . 2-13
Preparation for Storage . . . . . . . . . . . . . 2-13
Preparation for Shipment . . . . . . . . . . . . 2-13
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Chapter 2
Installation
2-1
INTRODUCTION
This chapter provides installation instructions for the Series 681XXC
Synthesized Signal Generator. It includes information on initial inspection, preparation for use, storage, and reshipment, and General
Purpose Interface Bus (GPIB) setup and interconnections.
WARNING
Use two or more people to lift and move this equipment, or
use an equipment cart. There is a risk of back injury, if this
equipment is lifted by one person.
2-2
INITIAL INSPECTION
Inspect the shipping container for damage. If the shipping container or
cushioning material is damaged, retain until the contents of the shipment have been checked against the packing list and the signal generator has been checked for mechanical and electrical operation.
If the shipment is incomplete or if the signal generator is damaged
mechanically or electrically, notify your local sales representative or
Anritsu Customer Service. If either the shipping container is damaged
or the cushioning material shows signs of stress, notify the carrier as
well as Anritsu. Keep the shipping materials for the carrier’s inspection.
681XXC OM
2-3
PREPARATION
FOR USE
INSTALLATION
2-3
PREPARATION FOR USE
Preparation for use consists of checking that the rear panel line voltage selector switch is set for the correct line voltage and connecting
the signal generator to the power source. The following paragraphs
provide these procedures along with information about power requirements, warmup times, and the operating environment.
Power
Requirements
The signal generator accepts 90 to 132 Vac and 180
to 264 Vac, 48 to 440 Hz, single-phase power. Power
consumption is 400 VA maximum. The signal generator is intended for Installation Category (Overvoltage Category) II.
CAUTION
Before applying power, verify that the unit is set to match
the available line voltage and that the installed fuse is of
the correct type and rating.
Line Voltage
Selection
The line voltage selector switch on the rear panel
can be set for either 110 Vac or 220 Vac operation
(Figure 2-1). When the switch is set to 110 Vac, the
681XXC accepts 90 to 132 Vac line voltage. When
the switch is set to 220 Vac, the 681XXC accepts 180
to 264 Vac line voltage. If the selector setting is incorrect for the line voltage available, change it to
the correct setting.
Whenever the selector setting is changed, the line
fuse must be changed to the correct value for the
line voltage selected. Line fuse values for the line
voltages are printed on the rear panel next to the
fuse holder.
WARNING
When supplying power to this equipment, always use a
three-wire power cable connected to a three-wire power line
outlet. If power is supplied without grounding the equipment in this manner, there is a risk of receiving a severe or
fatal electric shock.
Power
Connection
2-4
Connecting the 681XXC to line power automatically
places it in operation (front panel OPERATE LED
on). To connect it to the power source, plug the female end of the power cable into the input line voltage receptacle on the rear panel (Figure 2-1). Then
plug the male end of the power cord into a threewire power line outlet.
681XXC OM
PREPARATION
FOR USE
INSTALLATION
Line
Fuse
Line Voltage
Selector Switch
GPIB
Connector
Figure 2-1.
Standby
Operation
LEVEL
CONTROL
Signal Generator Rear Panel showing Power Connection
Whenever the signal generator is not being used it
should be left connected to the power source and
placed in standby. This keeps the internal timebase
frequency reference at operating temperature.
MODULATION
SYSTEM
OPERATE
On the front panel, press LINE to switch the
681XXC from OPERATE (green LED on) to
STANDBY (orange LED on).
LINE
NOTE
During standby operation, the fan runs
continuously.
STANDBY
Line
Key
681XXC OM
2-5
PREPARATION
FOR USE
INSTALLATION
Warmup Time
From Standby–When placing the 681XXC in operation from stand-by, allow 30 minutes warmup to
assure stable operation.
From a Cold Start (0°C)–The signal generator requires approximately 120 hours (5 days) of warm up
to achieve specified frequency stability with aging.
NOTE
Instruments disconnected from AC power
for more than 72 hours require 30 days to
return to specified aging.
Operating
Environment
The 681XXC can be operated within the following
environmental limits.
q
q
q
q
Temperature. 0°C to 50°C.
Humidity. 5 to 95% relative at 40°C.
Altitude. up to 4600 meters.
Cooling. Internal cooling is provided by forced
airflow from the fan mounted on the rear
panel.
CAUTION
Before installing the 681XXC in its operating environment,
ensure that all airflow passages at the sides and rear of the
instrument are clear. This is of particular importance whenever the unit is being rack-mounted.
Keep the cooling fan filter clean so that the ventilation holes
are not obstructed. A blocked fan filter can cause the instrument to overheat and shut down.
2-6
681XXC OM
GPIB SETUP AND
INTERCONNECTION
INSTALLATION
2-4
GPIB SETUP AND
INTERCONNECTION
The 681XXC provides automated microwave signal generation via the
GPIB. The following paragraphs provide information about interface
connections, cable requirements, setting the GPIB operating parameters, and selecting the external interface language.
Interface
Connector
Interface between the signal generator and other devices on the GPIB is via a 24-wire interface cable.
This cable uses connector shells having two connector faces. These double-faced connectors allow for
the parallel connection of two or more cables to a
single device. Figure 2-1 shows the location of the
rear panel GPIB connector.
Cable Length
Restrictions
The GPIB can accommodate up to 15 instruments at
any one time. To achieve design performance on the
bus, proper timing and voltage level relationships
must be maintained. If either the cable length between separate instruments or the cumulative cable
length between all instruments is too long, the data
and control lines cannot be driven properly and the
system may fail to perform. Cable length restrictions are as follows:
q
q
No more than 15 instruments may be installed
on the bus.
Total cumulative cable length in meters may
not exceed two times the number of bus instruments or 20 meters—whichever is less.
NOTE
For low EMI applications, the GPIB cable
should be a fully shielded type, with
well-grounded metal-shell connectors
GPIB Interconnection
The only interconnection required for GPIB operation is between the signal generator and the controller. This interconnection is via a standard GPIB
cable. The Anritsu Part number for such a cable is
2000-1, -2, or -4 (1, 2, or 4 meters in length).
Setting the
GPIB Address
The default GPIB address is 5. If a different GPIB
address is desired, it can be set from the front panel
using the Configure GPIB Menu.
To change the GPIB address, first press the front
panel main menu key labeled SYSTEM . The System Menu (shown on the following page) is displayed.
681XXC OM
2-7
INSTALLATION
GPIB SETUP AND
INTERCONNECTION
Now press the menu soft-key Config . The System
Configuration Menu (below) is displayed.
To go to the Configure GPIB menu from this menu,
press the menu soft-key GPIB . The Configure GPIB
Menu (below) is displayed.
Press the menu soft-key GPIB Address to change
the current GPIB address of the signal generator.
Enter a new address using the cursor control key or
the data entry keypad and the terminator key
Hz
ns
ADRS
The new GPIB address will now appear on the display. The entry must be between 1 and 30 to be recognized as a valid GPIB address.
2-8
681XXC OM
GPIB SETUP AND
INTERCONNECTION
INSTALLATION
Selecting the
Line
Terminator
Data is delimited on the GPIB by either the carriage
return (CR) ASCII character or both the carriage return and line feed (CR/LF) ASCII characters. Which
character is used depends upon the requirements of
the system controller. Most modern controllers can
use either CR or CR/LF, while many older controllers require one or the other. Consult the controller’s
manual for its particular requirements.
From the Configure GPIB Menu display, you can select which GPIB terminator to use by pressing the
menu soft-key Line Term . This menu soft-key toggles the GPIB terminator between CR and CR/LF.
The current selection appears on the display.
Selecting the
Interface
Language
Series 681XXC Synthesized Signal Generators can
be remotely operated via the GPIB using one of two
external interface languages—Native or SCPI (Option 19). The Native interface language uses a set of
681XXC GPIB Product Specific commands to control
the instrument; the SCPI interface language uses a
set of the Standard Commands for Programmable
Instruments commands to control the unit.
The Configure GPIB Menu has additional menu displays. For instruments with Option 19, selection of
which external interface language is to be used is
made from this additional menu. From the Configure GPIB Menu display, you can access the first
additional menu by pressing More . The first Additional Configure GPIB Menu (below) is displayed.
Press Native SCPI to select the external interface
language to be used. This menu soft-key toggles the
language selection between Native and SCPI. The
current selection appears on the display.
681XXC OM
2-9
RACK MOUNTING KIT
INSTALLATION
INSTALLATION
2-5
RACK MOUNTING KIT
INSTALLATION
The rack mounting kit (Option 1) contains a set of track slides (90° tilt
capability), mounting ears, and front panel handles for mounting the
signal generator in a standard equipment rack. The following procedure provides instructions for installing the rack mounting hardware
on to the instrument. Refer to Figures 2-2 and 2-3 during this procedure.
Preliminary
Disconnect the power cord and any other cables
from the instrument.
Procedure
Install the rack mounting hardware as follows:
Figure 2-2.
2-10
Step 1
Using a Phillips screwdriver, remove the
screws and the front handle assemblies
from the instrument. (For instruments
not having front handles, remove the
screws and the front top and bottom feet
from the instrument.) Retain the screws.
Step 2
Remove the four feet from the rear of the
instrument. Retain the screws.
Step 3
Remove the screws and the carrying handle from the side handle cover. (The two
screws fastening the carrying handle
through the side handle cover to the chassis are accessable by lifting up the rubber
covering at each end of the handle.)
Front Handle, Feet, and Carrying Handle Removal
681XXC OM
RACK MOUNTING KIT
INSTALLATION
INSTALLATION
NOTE
The screws with green heads have
metric threads. When it becomes
necessary to replace any of these
screws, always use the exact replacement green-headed screws
(Anritsu P/N 2000-560) to avoid
damage to the instrument.
Figure 2-3.
681XXC OM
Step 4
Remove the inner slide assemblies from
the outer slide assemblies.
Step 5
Place the left side inner slide assembly
onto the instrument case with the handle
towards the front of the instrument (Figure 2-3).
Step 6
Insert two green-headed screws through
the holes in the slide assembly behind the
handle and into the metric tapped holes
in the side of the instrument.
Step 7
Insert two green-headed screws through
the holes near the rear of the slide assembly and into the metric tapped holes in
the side of the instrument.
Step 8
Insert the two SAE threaded screws (removed from the feet) through the 90° tabs
on the rear of the slide assembly and into
the rear panel of the instrument.
Step 9
Using the Phillips screwdriver, tighten all
screws holding the left side slide assembly to the instrument chassis.
Rack Mounting Hardware Installation
2-11
RACK MOUNTING KIT
INSTALLATION
INSTALLATION
Step 10
Place the right side inner slide assembly
onto the instrument case with the handle
towards the front of the instrument.
Step 11
Insert two green-headed screws through
the holes in the slide assembly behind the
handle and into the metric tapped holes
in the side of the instrument.
Step 12
Insert two green-headed screws through
the holes near the rear of the slide assembly and into the metric tapped holes in
the side of the instrument.
Step 13
Insert the two SAE threaded screws (removed from the feet) through the 90° tabs
on the rear of the slide assembly and into
the rear panel of the instrument.
Step 14
Using the Phillips screwdriver, tighten all
screws holding the right side slide assembly to the instrument chassis.
Step 15
With the appropriate hardware, install
the outer slide assemblies onto the equipment rack.
Step 16
Lift the signal generator into position.
Align the inner and outer slide assemblies and slide the instrument into the
rack. Realign the hardware as needed for
smooth operation.
WARNING
Use two or more people to lift and move this equipment, or
use an equipment cart. There is a risk of back injury, if this
equipment is lifted by one person.
2-12
681XXC OM
PREPARATION FOR
STORAGE/SHIPMENT
INSTALLATION
2-6
PREPARATION FOR
STORAGE/SHIPMENT
The following paragraphs give instructions for preparing the 681XXC
for storage or shipment.
Preparation
for Storage
Preparing the signal generator for storage consists
of cleaning the unit, packing the inside with moisture-absorbing desiccant crystals, and storing the
unit in a temperature environment that is maintained between –40°C and +75°C.
Preparation
for Shipment
To provide maximum protection against damage in
transit, the signal generator should be repackaged
in the original shipping container. If this container
is no longer available and the unit is being returned
to Anritsu for repair, advise Anritsu Customer Service; they will send a new shipping container free of
charge. In the event neither of these two options is
possible, instructions for packaging and shipment
are given below.
Use a Suitable Container.
Obtain a corrugated cardboard carton with a 125 kg
test strength. This carton should have inside dimensions of no less than 15 cm larger than the unit dimensions to allow for cushioning.
Protect the Instrument.
Surround the unit with polyethylene sheeting to
protect the finish.
Cushion the Instrument.
Cushion the instrument on all sides by tightly packing dunnage or urethane foam between the carton
and the unit. Provide at least three inches of dunnage on all sides.
Seal the Container.
Seal the carton by using either shipping tape or an
industrial stapler.
Address the Container.
If the instrument is being returned to Anritsu for
service, mark the address of the appropriate Anritsu
service center (Table 2-1) and your return address
on the carton in one or more prominent locations.
681XXC OM
2-13
ANRITSU
SERVICE CENTERS
INSTALLATION
Table 2-1.
ANRITSU Service Centers
UNITED STATES
ANRITSU COMPANY
490 Jarvis Drive
Morgan Hill, CA 95037-2809
Telephone: (408) 776-8300
1-800-ANRITSU
FAX: 408-776-1744
FRANCE
ANRITSU S.A
9 Avenue du Quebec
Zone de Courtaboeuf
91951 Les Ulis Cedex
Telephone: 016-09-21-550
FAX: 016-44-61-065
GERMANY
ANRITSU COMPANY
10 New Maple Ave., Unit 305
Pine Brook, NJ 07058
Telephone: (201) 227-8999, 1-800-ANRITSU
FAX: 201-575-0092
ANRITSU GmbH
Grafenberger Allee 54-56
D-40237 Dusseldorf, Germany
Telephone: 0211-968550
FAX: 0211-9685555
INDIA
ANRITSU COMPANY
1155 E. Collins Blvd
Richardson, TX 75081
Telephone: 1-800-ANRITSU
FAX: 972-671-1877
AUSTRALIA
ANRITSU PTY. LTD.
Unit 3, 170 Foster Road
Mt Waverley, VIC 3149
Australia
Telephone: 03-9558-8177
FAX: 03-9558-8255
BRAZIL
ANRITSU ELECTRONICA LTDA.
Praia de Botafogo, 440, Sala 2401
CEP22250-040, Rio de Janeiro, RJ, Brasil
Telephone: 021-527-6922
FAX: 021-53-71-456
CANADA
ANRITSU INSTRUMENTS LTD.
215 Stafford Road, Unit 102
Nepean, Ontario K2H 9C1
Telephone: (613) 828-4090
FAX: (613) 828-5400
MEERA AGENCIES (P) LTD.
23 Community Center
Kailash Colony Extension
New Delhi, India
Telephone: 91-11-6442700
FAX: 91-11-6442500
ISRAEL
TECH-CENT, LTD.
4 Raul Valenberg St
Tel-Aviv 69719
Telephone: (03) 64-78-563
FAX: (03) 64-78-334
ITALY
ANRITSU Sp.A
Roma Office
Via E. Vittorini, 129
00144 Roma EUR
Telephone: (06) 50-99-711
FAX: (06) 50-22-4252
KOREA
ANRITSU CORPORATION LTD.
8F, Seocho-Dong, Secho-Ku
Seoul, 137-070
South Korea
Telephone: 2-581-6603
FAX: 2-582-6603
JAPAN
ANRITSU CUSTOMER SERVICE LTD.
1800 Onna Atsugi-shi
Kanagawa-Prf. 243 Japan
Telephone: 0462-96-6688
FAX: 0462-25-8379
SINGAPORE
ANRITSU (SINGAPORE) PTE LTD.
6 New Industrial Road #06-01/02
Hoe Huat Industrial Bldg
Singapore 536199
Telephone: 282-2400
FAX: 282-2533
SOUTH AFRICA
ETECSA
12 Surrey Square Office Park
330 Surrey Avenue
Ferndale, Randburt, 2194
South Africa
Telephone: 011-27-11-787-7200
FAX: 011-27-11-787-0446
SWEDEN
ANRITSU AB
Botivid Center
Fittja Backe 13A
S145 84 Stockholmn
Telephone: (08) 534-707-00
FAX: (08) 534-707-30
TAIWAN
ANRITSU CO., LTD.
6F, No. 96, Section 3
Chien Kuo N. Road
Taipei, Taiwan, R.O.C.
Telephone: (02) 515-6050
FAX: (02) 509-5519
UNITED KINGDOM
ANRITSU LTD.
200 Capability Green
Luton, Bedfordshire
LU1 3LU, England
Telephone: 015-82-433200
FAX: 015-82-731303
CHINA
ANRITSU ELECTRONICS (SHANGHAI) CO.
LTD.
2F, Rm B 52 Section Factory Building
No. 516 Fu Te Rd (W)
Shanghi 200131 China
Telephone: 21-58680226, 58680227
FAX: 21-58680588
2-14
681XXC OM
Chapter 3
Local (Front Panel) Operation
Table of Contents
3-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 3-5
3-2
FRONT PANEL LAYOUT.
Line Key . . . . . . . .
Data Display Area . . . .
Data Entry Area . . . . .
RF Output Control Key .
Connectors . . . . . . .
3-3
DATA DISPLAY AREA . . . . . . . . . . . . . . . . 3-8
Menu Display Format . . . . . . . . . . . . . . 3-9
Menu Keys . . . . . . . . . . . . . . . . . . . 3-10
3-4
DATA ENTRY AREA. . . . . . . . . . . . . . . . . 3-12
3-5
INSTRUMENT START-UP . . . .
Powering Up the 681XXC . . . .
Start-Up Display . . . . . . . .
Standby Operation . . . . . . .
Self-Testing the 681XXC . . . .
Resetting to Default Parameters
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3-14
3-14
3-14
3-14
3-15
3-15
3-6
ENTERING DATA . . . . . . . .
Opening the Parameter . . . .
Editing the Current Value . .
Entering a New Value . . . .
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3-18
3-18
3-19
3-20
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3-6
3-6
3-6
3-7
3-7
3-7
Table of Contents (Continued)
3-2
3-7
CW FREQUENCY OPERATION
Selecting CW Mode . . . . . .
Selecting a CW Frequency . .
Selecting a Power Level. . . .
CW Ramp . . . . . . . . . .
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3-21
3-21
3-22
3-24
3-25
3-8
SWEEP FREQUENCY OPERATION . . . . . . . .
Analog Sweep Mode . . . . . . . . . . . . . .
Selecting Analog Sweep Mode. . . . . . . . . .
Setting the Analog Sweep Time . . . . . . . . .
Selecting a Sweep Trigger . . . . . . . . . . .
Step Sweep Mode . . . . . . . . . . . . . . . .
Selecting Step Sweep Mode . . . . . . . . . . .
Setting Step Size, Dwell Time, and Sweep Time .
Manual Sweep Mode . . . . . . . . . . . . . .
Selecting Manual Sweep Mode . . . . . . . . .
Selecting a Sweep Range . . . . . . . . . . . .
Selecting a Power Level. . . . . . . . . . . . .
Frequency Markers . . . . . . . . . . . . . . .
Selecting Alternate Sweep Mode . . . . . . . .
List Sweep Mode . . . . . . . . . . . . . . . .
Selecting List Sweep Mode . . . . . . . . . . .
Editing the List . . . . . . . . . . . . . . . .
Selecting a List Sweep Range . . . . . . . . . .
Selecting a List Sweep Trigger . . . . . . . . .
3-26
3-26
3-26
3-27
3-28
3-29
3-29
3-29
3-32
3-32
3-33
3-35
3-36
3-38
3-41
3-42
3-43
3-46
3-47
3-9
FIXED POWER LEVEL OPERATION
Selecting Fixed Power Level Mode .
Selecting a Power Level. . . . . . .
Level Offset . . . . . . . . . . . .
3-49
3-49
3-49
3-52
3-10
POWER LEVEL SWEEP OPERATION. . . . . .
Selecting CW Power Sweep Mode . . . . . . .
Setting CW Power Sweep Step Size and
Dwell Time . . . . . . . . . . . . . . . . .
Selecting a CW Power Sweep Trigger . . . . .
Selecting a Power Level Sweep Range. . . . .
Selecting a Sweep Frequency/Step Power Mode
Setting Power Level Step Size . . . . . . . .
.
.
.
.
. . . .
. . .
. . .
. . .
. . .
. . . .
. . .
. . .
. . .
.
.
.
.
.
.
.
.
.
.
.
.
.
. 3-53
. 3-53
.
.
.
.
.
3-54
3-55
3-56
3-58
3-59
681XXC OM
Table of Contents (Continued)
3-11
LEVELING OPERATIONS . . . . . . . . . . .
Selecting a Leveling Mode . . . . . . . . .
Attenuator Decoupling . . . . . . . . . . .
ALC Power Slope . . . . . . . . . . . . . .
User Cal (User Level Flatness Correction) .
.
.
.
.
.
.
.
.
.
.
3-60
3-60
3-64
3-65
3-67
3-12
SIGNAL MODULATION . . . . . . . . . . . .
Amplitude Modulation Operating Modes . .
Providing Amplitude Modulation . . . . . .
Frequency Modulation Operating Modes . .
Providing Frequency Modulation . . . . . .
Square Wave Modulation Operating Modes .
Providing Square Wave Modulation . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
3-73
3-73
3-73
3-74
3-75
3-77
3-77
3-13
SYSTEM CONFIGURATION . .
Configuring the Front Panel .
Configuring the Rear Panel . .
Configuring the RF . . . . . .
Configuring the GPIB . . . .
Setting Increment Sizes . . .
.
.
.
.
.
.
.
.
.
.
.
.
3-80
3-81
3-82
3-83
3-85
3-88
3-14
SAVING/RECALLING INSTRUMENT SETUPS
Saving Setups . . . . . . . . . . . . . . . .
Recalling Setups . . . . . . . . . . . . . . .
Erasing Stored Setups . . . . . . . . . . . .
.
.
.
.
3-89
3-89
3-89
3-90
3-15
SECURE OPERATION . . . . . . . . . . . . . . . 3-91
3-16
REFERENCE OSCILLATOR CALIBRATION . . . 3-92
681XXC OM
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. . . .
. . .
. . .
. . .
. . .
. . .
3-3
Chapter 3
Local (Front Panel) Operation
3-1
INTRODUCTION
681XXC OM
This chapter provides information and instructions on operating the
Series 681XXC Synthesized Signal Generator using the front panel
controls. It contains the following:
q
Illustrations and diagrams of the front panel, data display area,
and data entry area that identify and describe all front panel
controls, inputs, and outputs.
q
An annotated diagram of the menu display format showing
where the current frequency, power, and modulation information
is displayed.
q
Instructions for performing signal generator operations; namely,
frequency and frequency sweep, power level and power sweep,
signal modulation, saving and recalling instrument setups, and
system configuration.
3-5
LOCAL (FRONT
PANEL) OPERATION
3-2
FRONT PANEL
LAYOUT
The 681XXC front panel is divided into two main areas—the data display area and the data entry area. The following paragraphs provide a
brief description of the front panel controls, inputs, outputs, and data
display and data entry areas as shown in Figure 3-1. Detailed descriptions of the data display and data entry areas are contained in paragraphs 3-3 and 3-4.
FRONT PANEL LAYOUT
D a ta D is p la y
R F O u tp u t
C o n tro l
K e y
D a ta E n try
B a c k
S p a c e
C le a r
E n try
S y n th e s iz e d
S ig n a l
G e n e ra to r
C W /S W E E P
S E L E C T
7
F R E Q U E N C Y
C O N T R O L
O u tp u t
9
O n
8
4
O ff
M H z
5
6
k H z
L E V E L
C O N T R O L
1
2
M O D U L A T IO N
O p e ra te
M o d u la tio n
L in e
A M
In
F M
In
In
3
m s
S te p
R F O u tp u t
H z
n s
A d rs
0
S Y S T E M
E x te rn a l
A L C In
S ta n d b y
Figure 3-1.
S e c
d B m
m s
d B
L E V E L /A L C
S E L E C T
L in e
K e y
G H z
5 0 W
C A U T IO N
R F O u tp u t
M a y E x c e e d 1 0 0 m W
M o d u la tio n
C o n n e c to rs
M e n u
K e y s
E x te rn a l
A L C
C o n n e c to r
R F O u tp u t
C o n n e c to r
Front Panel, 681XXC Synthesized Signal Generator
Line Key
The line key provides for turning the signal generator on and off. STANDBY (off) is indicated by an orange LED; OPERATE (on) by a green LED.
Data Display
Area
The data display area consists of the data display
and the surrounding menu keys.
Data Display
The data display provides information about the
current status of the 681XXC in a menu display format. This information includes the operating mode
of the instrument, the value of the active frequency
and power level parameters, and the modulation
status.
Menu Keys
Menu keys provide for selecting the operating mode,
parameters, and configuration of the signal generator.
3-6
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
FRONT PANEL
LAYOUT
Data Entry
Area
The data entry area consists of data entry keys and
controls that provide for (1) changing values for
each 681XXC parameter, and (2) terminating the
value entry and assigning the appropriate units
(GHz, MHz, dBm, etc.).
RF Output
Control Key
The RF output control key provides for turning the
RF output power on and off. OUTPUT OFF is indicated by a red LED; OUTPUT ON by a yellow LED.
Connectors
The front panel has both input and output connectors.
Modulation Connectors
The modulation connectors provide for applying external AM, FM, or Square Wave modulation to the
RF output signal.
External ALC Connector
The external ALC connector provides for leveling
the RF output signal externally using either a detector or a power meter.
RF Output Connector
The RF output connector provides RF output from a
50W source.
NOTE
To prevent power losses due to an impedance mismatch, the mating connector and
cable should also be rated at 50W.
681XXC OM
3-7
LOCAL (FRONT
PANEL) OPERATION
3-3
DATA DISPLAY AREA
DATA DISPLAY
AREA
The data display area consists of the data display and the surrounding
menu keys. The data display is a dot matrix liquid crystal display
(LCD) that provides 16 lines of 40 characters each. Information is presented on the LCD in the form of menu displays. The menu keys either select the main menu to be displayed, select a sub-menu of the
current menu display, or control a function on the current menu display.
Figure 3-2 shows the format of the menu display and identifies the
display elements. It also shows the placement of the menu keys in relation to the display. The paragraphs that follow provide descriptions
of the menu display elements and the menu keys.
Main Menu
Keys
Main Menu
Key Cursor
Frequency
Mode
Title Bar
Frequency
Parameters
Area
Level Mode
Title Bar
Level
Parameters
Area
Menu
Labels
Side Keys
Menu
Soft-Keys
CW/SWEEP
SELECT
FREQUENCY
CONTROL
LEVEL/ALC
SELECT
LEVEL
CONTROL
Modulation
Title Bars
MODULATION
SYSTEM
Modulation
Status Areas
Figure 3-2.
3-8
Menu
Soft-Keys
Menu Labels
Bottom Keys
Front Panel Data Display Area
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
DATA DISPLAY
AREA
Menu Display
Format
The menu display is divided into specific areas that
show the frequency, power level, and modulation information for the current signal generator setup.
Menu labels for the current menu’s soft-keys appear
along the bottom and right side of the display.
Title Bars
A shaded title bar identifies each parameter area.
Mode information is displayed in reverse video on
the title bars.
q
q
q
Frequency Mode Title Bar—The current
frequency mode (CW, Analog Sweep, Step
Sweep, Manual Sweep, or List Sweep) appears
on the left side of the bar. In an analog, step, or
list sweep mode, the type of sweep trigger appears on the right side.
Level Mode Title Bar—The current power
level mode (Level or Level Sweep) appears on
the left side of the bar. In a level sweep mode,
the type of sweep trigger appears on the right
side of the bar.
Modulation Title Bars—Each type of signal
modulation (AM, FM, Square Wave) has a
separate title bar on the display.
Parameter Areas
The parameter areas show the frequency, power
level, and modulation information for the current
681XXC setup.
q
q
q
Frequency Parameters Area—The current
CW frequency in GHz, the start and stop frequencies of the current frequency sweep range
in GHz, the current list index and frequency, or
the start and stop indexes for the list sweep
are displayed in this area.
Power Level Parameters Area—The current power level in dBm or mV, or the start
and stop levels of the current power level
sweep range in dBm or mV are displayed in
this area.
Modulation Status Areas—These areas display ON or OFF to indicate the status of signal
modulation for the current setup.
Menu Labels
Each of the menu soft-keys, located below and to the
right of the display, has a corresponding menu label
area on the display. These labels identify the function of the soft-keys for the current menu display. In
681XXC OM
3-9
LOCAL (FRONT
PANEL) OPERATION
DATA DISPLAY
AREA
most cases, when a menu soft-key is pressed, its
menu label changes appearance to visually show the
On/Off condition.
Window Display
A window display that overlays a portion of the current menu display is used to (1) show the parameter
being edited; (2) display selection lists of preset frequencies, power levels, markers, etc.; (3) show the
modulation and system configuration choices and
current selections; or (4) show self-test error messages. A typical window display is shown on the left.
Menu Keys
CW/SWEEP
SELECT
FREQUENCY
CONTROL
LEVEL/ALC
SELECT
As shown in Figure 3-2, there are two types of menu
keys that surround the data display—main menu
keys and menu soft-keys. The main menu keys are
positioned to the left of the data display. The menu
soft-keys are located at the bottom and to the right
of the data display.
Main Menu Keys
Each of the main menu keys, shown on the left, selects a main (top-level) menu display. These menus
let you select the operating mode, operating parameters, and configuration of the instrument. A
brief functional description of each main menu follows.
q
q
LEVEL
CONTROL
MODULATION
SYSTEM
q
q
3-10
CW/SWEEP SELECT—This menu lets you
select between CW, Analog, Step, Manual, and
List Sweep frequency modes.
FREQUENCY CONTROL—In CW frequency
mode, this menu lets you select the CW frequency parameter (F0-F9 or M0-M9) to use. In
the Analog, Step, or Manual Sweep frequency
mode, this menu lets you select the sweep
range parameters (Full, F1-F2, F3-F4, F5-dF,
or F6-dF) to use. In Analog or Step Sweep frequency mode, the menu also lets you select up
to 20 independent, pre-settable frequency
markers.
LEVEL/ALC SELECT—This menu lets you
select power level and ALC modes (Level,
Level Sweep, Level Offset, ALC on or off, internal or external ALC, ALC/attenuator decoupling, ALC slope, and user level flatness correction).
LEVEL CONTROL—In Level mode, this
menu lets you select the level parameter (L0L9) to use for a CW frequency or a frequency
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
DATA DISPLAY
AREA
q
q
sweep. In the Level Sweep mode, this menu
lets you select the power sweep range parameters to use.
MODULATION—This menu provides you
with access to sub-menus that let you select
the type of signal modulation (AM, FM, or
Square Wave) and control the option settings
for each type.
SYSTEM—This menu provides you with access to sub-menus that let you (1) reset the instrument to factory-selected default values; (2)
configure the front panel, rear panel, RF, and
GPIB; (3) set incremental sizes for editing frequency, power level, and time parameters; (4)
save or recall instrument setups; (5) disable
front panel data display; (6) perform instrument self-test; and (7) perform reference oscillator calibration.
Main Menu Key Cursor
With the exception of the SYSTEM key, when any
main menu key is pressed, the main menu that is
displayed contains a cursor positioned adjacent to
the pressed key (Figure 3-2). The cursor is displayed
on all sub-menus of the current menu until a different main menu key is pressed.
When the SYSTEM key is pressed, the System
menu is displayed. The System menu and its submenus do not contain a main menu key cursor.
CW/SWEEP
SELECT
FREQUENCY
CONTROL
LEVEL/ALC
SELECT
LEVEL
CONTROL
MODULATION
SYSTEM
681XXC OM
Menu Soft-Keys
As shown on the left, five menu soft-keys are located
below the data display and five menu soft-keys are
located to the right of the data display. In general,
the menu soft-keys located below the data display
select a sub-menu of the current main (top-level)
menu display; the menu soft-keys located to the
right of the data display either control a function on
the current menu display or select an additional
sub-menu. Menu labels that identify the current
function of each soft-key are shown on the menu display adjacent to the soft-keys.
3-11
LOCAL (FRONT
PANEL) OPERATION
3-4
DATA ENTRY
AREA
The value of a selected 681XXC parameter can be changed using the
rotary data knob and/or keys of the data entry area. Each element of
the data entry area is identified in Figure 3-3 and described in the following paragraphs.
DATA ENTRY AREA
Cursor
Control
Key
Back
Space
Key
Clear
Entry
Key
CLEAR
ENTRY
7
Terminator
Keys
BACK
SPACE
8
9
GHz
Sec
dBm
MHz
ms
dB
4
5
6
kHz
1
2
3
m s
STEPS
Hz
ns
ADRS
0
Rotary
Data
Knob
Figure 3-3.
Keypad
Front Panel Data Entry Area
Cursor Control Key
In general, this diamond-shaped key controls the
movement of the cursor on the display. When a parameter is opened for editing, a cursor appears under the open parameter. Each time the < or > pad is
pressed, the cursor moves left or right by one digit.
The Ù or Ú pad can then be used to increase or decrease the value of the parameter. The unit size of
the increase or decrease that occurs each time the Ù
or Ú pad is pressed is determined by the cursor position.
In addition, when editing frequency, power level,
and time parameters, the incremental size can be
set to a specific value using the system configuration increment menu (paragraph 3-13). Once set and
activated, each time the Ù or Ú pad is pressed, the
parameter’s value increases or decreases by the set
amount.
3-12
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
DATA ENTRY
AREA
Rotary Data Knob
The rotary data knob can be used to change the
value of a parameter that is open for editing. The
cursor is moved under the open parameter using the
< and > pads of the cursor control key. Then, by
slowly turning the knob clockwise or counterclockwise the value of the parameter is increased or
decreased by the unit size. The unit size is determined by the cursor placement. Turning the knob
rapidly changes the value of the parameter in larger
steps.
When editing frequency, power level, and time parameters, the incremental size can be set to a specific value using the system configuration increment
menu (paragraph 3-13). Once set and activated,
each time the knob is turned clockwise or counterclockwise, the param-eter’s value increases or decreases by the set amount.
KEYPAD
The numeric keypad provides for entering frequency, power level, time, and number-of-steps parameters and GPIB address values. The “–” key
functions as a “change sign” key during any keypad
entry.
CLEAR ENTRY Key
When a parameter is open for editing, the CLEAR
ENTRY key is used to clear the parameter entry.
BACK SPACE Key
The BACK SPACE key is used to correct keypad
data entry errors by deleting the last number, “–”, or
decimal point entered.
NOTE
When Linear power level units are
selected, use the following terminator keys for power level data
entries.
GHz / Sec / dBm for V
MHz / ms / dB for mV
kHz / ms / STEPS for mV
681XXC OM
Terminator Keys
The terminator keys are used to terminate keypad
data entries and change the parameter values in
memory. If the entered value is outside the allowable range of the open parameter, an error message
will be displayed along with an audible “beep”. The
terminator keys are as follows:
GHz / Sec / dBm
MHz / ms / dB
kHz / ms / STEPS
Hz / ns / ADRS
3-13
LOCAL (FRONT
PANEL) OPERATION
3-5
INSTRUMENT START-UP
INSTRUMENT
START-UP
Now that you have familiarized yourself with the layout of the signal
generator’s front panel controls and data display, you are ready to begin operating the instrument. Begin by powering it up.
Powering Up
the 681XXC
Connect the 681XXC to an ac power source by following the procedure in the Installation chapter.
This automatically places the instrument in operation (front panel OPERATE LED on).
Start-Up
Display
During power up, the message Please Wait...
LOADING PROGRAMS appears on the data display.
When all programs have been loaded, the start-up
screen (below) is displayed. It provides you with the
model number of the signal generator and the revision level of the installed firmware.
The 681XXC then returns to the exact configuration
it was in when last turned off.
Standby
Operation
LEVEL
CONTROL
MODULATION
SYSTEM
OPERATE
NOTE
During standby operation, the fan runs
continuously.
LINE
STANDBY
Line
Key
3-14
Whenever the signal generator is not being used, it
should be left connected to the power source and
placed in standby. Standby operation provides
power to keep the internal time base at operating
temperature. This assures specified frequency accuracy and stability when the 681XXC is place in operation.
Press LINE to switch the 681XXC from OPERATE
(green LED on) to STANDBY (orange LED on).
NOTE
When switching to operate from standby,
allow at least a 30-minute warmup before
beginning signal generator operations.
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
INSTRUMENT
START-UP
Self-Testing
the 681XXC
The 681XXC firmware includes internal diagnostics
that self-test the instrument. These self-test diagnostics perform a brief go/no-go test of most of the
PCBs and other internal assemblies. If the signal
generator fails self-test, an error message is displayed on the data display. Error messages and descriptions are listed in the Operator Maintenance
chapter of this manual.
CAUTION
During self-test with RF OUTPUT set to ON, the output
power level is set to 0 dBm. Always disconnect sensitive
equipment from the unit before performing self-test.
You can perform a self-test of the signal generator at
any time during normal operation. To perform a
self-test from any menu, press SYSTEM . Then,
when the System Menu (below) is displayed, press
Selftest .
Resetting to
Default
Parameters
You can reset the 681XXC to the factory-selected
default parameter values at any time during normal
operation. The default parameters are shown in
Table 3-1 on the following page.
NOTE
Resetting the instrument clears the setup
presently in place. If these parameter values are needed for future testing, save
them as a stored setup before resetting
the signal generator. (For information on
saving/recalling instrument setups, refer
to paragraph 3-14.)
To reset the signal generator, press SYSTEM .
When the System Menu (above) is displayed, press
Reset .
681XXC OM
3-15
LOCAL (FRONT
PANEL) OPERATION
Table 3-1.
RESET (DEFAULT)
PARAMETERS
Reset (Default) Paramenters (1 of 2)
FREQUENCY PARAMETERS (GHz)
681XXC
MODEL
NUMBER F0
F1
F2
F3
F4
F5
F6
F7
F8
F9
M0
M1
M2
M3
M4
M5
M6
M7
M8
M9
DF
8.4
8.4
8.4
8.4
8.4
3.5
2.0
8.4
2.0
5.0
8.0
8.4
8.4
8.4
8.4
1.0
68117C
3.5
2.0
2.0
5.0
8.0
68137C
3.5
2.0 20.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 3.5
2.0 20.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 1.0
68147C
3.5
2.0 20.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 3.5
2.0 20.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 1.0
68167C
3.5
2.0 40.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 3.5
2.0 40.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 1.0
68177C
3.5
2.0 50.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 3.5
2.0 50.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 1.0
68187C
3.5
2.0 60.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 3.5
2.0 60.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 1.0
68197C
3.5
2.0 65.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 3.5
2.0 65.0 2.0
5.0
8.0 11.0 14.0 17.0 20.0 1.0
681XXC
MODEL
NUMBER
L0
L1
L2
L3
L4
L5
L6
L7
L8
L9
68117C
+1.0
0.0
–1.0
–2.0
–3.0
–4.0
–5.0
–6.0
–7.0
–8.0
68137C
+1.0
0.0
–1.0
–2.0
–3.0
–4.0
–5.0
–6.0
–7.0
–8.0
68147C
+1.0
0.0
–1.0
–2.0
–3.0
–4.0
–5.0
–6.0
–7.0
–8.0
68167C
+1.0
0.0
–1.0
–2.0
–3.0
–4.0
–5.0
–6.0
–7.0
–8.0
68177C
+1.0
0.0
–1.0
–2.0
–3.0
–4.0
–5.0
–6.0
–7.0
–8.0
68187C
+1.0
0.0
–1.0
–2.0
–3.0
–4.0
–5.0
–6.0
–7.0
–8.0
68197C
+1.0
0.0
–1.0
–2.0
–3.0
–4.0
–5.0
–6.0
–7.0
–8.0
3-16
POWER LEVEL PARAMETERS (dBm)
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
Table 3-1.
RESET (DEFAULT)
PARAMETERS
Reset (Default) Paramenters (2 of 2)
STEP SWEEP
681XXC
MODEL
NUMBER
SWEEP
TIME
68117C
LEVEL SWEEP
LEVEL
OFFSET
DWELL TIME
NUMBER OF
STEPS
DWELL TIME
NUMBER OF
STEPS
50 ms
1 ms
50
50 ms
50
0.0 dB
68137C
50 ms
1 ms
50
50 ms
50
0.0 dB
68147C
50 ms
1 ms
50
50 ms
50
0.0 dB
68167C
50 ms
1 ms
50
50 ms
50
0.0 dB
68177C
50 ms
1 ms
50
50 ms
50
0.0 dB
68187C
50 ms
1 ms
50
50 ms
50
0.0 dB
68197C
50 ms
1 ms
50
50 ms
50
0.0 dB
681XXC OM
3-17
LOCAL (FRONT
PANEL) OPERATION
3-6
ENTERING DATA
ENTERING
DATA
Before proceeding to the various modes of signal generator operation,
you need to know how to enter data from the front panel. Entering
data refers to changing a parameter’s value by editing its current
value or entering a new value to replace the current value. The following instructions describe how to (1) open a parameter, (2) edit its current value, and (3) enter a new value.
A typical 681XXC menu display (below) is used throughout the data
entry instructions. At this menu display, you can edit both the CW frequency and the output power level parameters.
If you wish to follow along on your 681XXC, you can obtain this same
menu display by resetting your instrument (press SYSTEM , then
press Reset ).
Opening the
Parameter
In order for the value of a parameter to be changed,
the parameter must first be opened.
To open the frequency parameter from the above
menu, press Edit F1 . The menu display now
changes to show that the menu soft-key Edit F1 has
been pressed and that the frequency parameter has
been opened. An open parameter is indicated by
placing it in a window with a movable cursor under
its digits.
Only one parameter can be open at a time. If you
press Edit L1 then the frequency parameter will
close and the power level parameter will open.
3-18
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
ENTERING
DATA
Editing the
Current Value
Cursor
Control
Key
Rotary
Data
Knob
To change the current value of a parameter by editing, you can use either the cursor control key or the
rotary data knob.
Using the Cursor Control Key
Using the < and > pads of the cursor control key,
move the cursor under the digit where you want to
begin editing. Then increase or decrease the value of
the parameter using the Ù or Ú pad of the cursor
control key. The unit size of the increase or decrease
that occurs each time the Ù or Ù pad is pressed is determined by the cursor position.
Using the Rotary Data Knob
You can also increase or decrease the value of the
parameter using the rotary data knob. Once you
have positioned the cursor under the digit where
you want to begin editing, slowly turn the knob
clockwise or counter-clockwise to increase or decrease the value of the parameter by the unit size.
Turning the knob rapidly changes the value of the
parameter in larger steps.
Using a Set Increment
When editing frequency, power level, and time parameters, you can increase or decrease the parameter’s value by a set amount each time the Ù or Ú pad
is pressed or the rotary data knob is turned clockwise or counter-clockwise. For instructions on setting the increment size, refer to paragraph 3-13.
Now, try changing the current value of the CW frequency displayed on your synthesizer from 2.0 GHz
to 6.395 GHz. Use both the cursor control key’s Ù
and Ú pads and the rotary data knob to make the
value changes. When you are finished, your menu
display should look like the example below.
To close the open parameter when you are finished
editing , press Edit F1 or make another menu selection.
681XXC OM
3-19
LOCAL (FRONT
PANEL) OPERATION
ENTERING
DATA
Entering a
New Value
Back
Space
Key
Clear
Entry
Key
CLEAR
ENTRY
7
BACK
SPACE
8
9
Terminator
Keys
5
6
1
2
3
Sec
dBm
MHz
kHz
m s
STEPS
Hz
ns
ADRS
0
Keypad
As soon as you press one of the keys on the data entry keypad, the current parameter display clears for
entry of a new value. Enter the new value for the
parameter, then press the appropriate terminator
key to store it in memory. If the entered value is outside the allowable range of the open parameter, the
entry is not accepted and the previous value for the
parameter is displayed.
GHz
ms
dB
4
To change the current value of a parameter by entering a new value for the parameter, use the data
entry keypad and termination keys.
NOTE
A frequency entry may be terminated in
GHz, MHz, kHz, or Hz; however, it is always displayed on the data display in
GHz. A time entry may be terminated in
Sec, ms, ms, or ns; however it is always
displayed on the data display in Sec.
If you make an error during data entry, either (1)
press BACK SPACE to delete the entry one character at a time starting from the last character entered, or (2) delete the entire entry by pressing
CLEAR ENTRY . Then, reenter the correct value.
Now, try entering a new value for the CW frequency
displayed on your synthesizer using the data entry
keypad and termination keys.
To close the open parameter when you are finished
entering data, press Edit F1 or make another menu
selection.
3-20
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
3-7
CW FREQUENCY
OPERATION
CW FREQUENCY
OPERATION
One of the signal generator’s major functions is to produce discrete
CW frequencies across the frequency range of the instrument. The
following paragraphs describe how to place the 681XXC in the CW
frequency mode, select a CW frequency and power level for output,
and activate the CW ramp. Use the CW Frequency Mode menu map
(Chapter 4, Figure 4-2) to follow the menu sequences.
Selecting CW
Mode
To place the 681XXC in the CW frequency mode,
press the main menu key
CW/SWEEP
SELECT
At the resulting menu display, press CW . The CW
Menu (below) is displayed.
NOTE
When the signal generator is reset,
it automatically comes up operating
in the CW frequency mode.
This menu lets you perform the following:
q
q
q
q
q
681XXC OM
Select a CW frequency for output.
Copy the current frequency and power information to the current list index. (Refer to page
3-41 for the list sweep frequency mode operating instructions.)
Go to the master-slave menu. (Refer to Chapter 7, paragraph 7-2 for Master-Slave mode operating instructions.)
Select an output power level for the CW frequency.
Go to the CW ramp menu (set the ramp sweep
time and turn the CW ramp on/off).
3-21
LOCAL (FRONT
PANEL) OPERATION
CW FREQUENCY
OPERATION
Selecting a
CW
Frequency
There are several ways to select a CW frequency for
output. You can (1) edit the current frequency, (2)
enter a new frequency, or (3) select one of the 20 preset frequency parameters.
Editing the Current Frequency
Press Edit F1 to open the frequency parameter,
then edit the current CW frequency using the cursor
control key or the rotary data knob. To close the
open frequency parameter, press Edit F1 or make
another menu selection.
Entering a New Frequency
Press Edit F1 to open the frequency parameter,
then enter the new CW frequency using the keypad
and appropriate terminator key. To close the open
frequency parameter, press Edit F1 or make another menu selection.
Selecting a Preset Frequency
To select one of the preset frequencies for output,
press the main menu key
FREQUENCY
CONTROL
The CW Frequency Control Menu (below) is displayed.
This menu lets youperform the following:
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q
q
3-22
Select preset frequencies F0, F1, F2, M1, or M2
for output.
Go to the frequency list menu (to tag, edit,or
output a frequency from the list).
Go to the tagged frequencies menu (select a
tagged frequency for output).
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
CW FREQUENCY
OPERATION
Frequency List–To go to the Frequency List Menu
(below), press Freqs List . This menu lets you tag,
edit, or output a frequency from the list.
Use the cursor control key to select a frequency from
the frequency list. The selected frequency is highlighted in reverse video and displayed in full below
the frequency list.
Press Tag to mark a selected frequency (place an F
in front of it). If the frequency is already tagged,
pressing Tag will untag it (remove the F). Tagging
selected frequencies lets you quickly switch between
them using the scan keys of the Tagged Frequencies
menu.
Press Edit to edit the selected frequency or enter a
new frequency.
Press Output Freq to output the selected frequency.
This frequency is output until you select another
frequency from the list and press Output Freq . On
the frequency list, the output frequency selection is
marked by a black square or, if tagged, an F highlighted in reverse video.
Return to the CW Frequency Control Menu display
by pressing Previous Menu .
681XXC OM
3-23
LOCAL (FRONT
PANEL) OPERATION
CW FREQUENCY
OPERATION
Scanning Tagged Frequencies–To go to the
Tagged Frequencies Menu (below) from the CW Frequency Control menu, press Tag Freq Menu .
This menu lets you select the tagged frequencies for
output using the Scan Up and Scan Dn keys.
Return to the CW Frequency Control Menu display
by pressing Previous Menu .
Selecting a
Power Level
While in the CW frequency mode, you can edit the
current CW frequency output power level or enter a
new output power level.
Editing the Current Power Level
Press Edit L1 to open the power level parameter,
then edit the current power level using the cursor
control key or rotary data knob. To close the open
power level parameter, press Edit L1 or make another menu selection.
Entering a New Power Level
Press Edit L1 to open the power level parameter,
then enter the new power level using the keypad
and appropriate terminator key. To close the open
power level parameter, press Edit L1 or make another menu selection.
NOTE
You can also select any of the preset
power levels or a power level sweep for a
CW frequency. For instructions, refer to
paragraphs 3-9 (Fixed Power Level Operation) and 3-10 (Power Level Sweep
Operation).
3-24
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
CW Ramp
When active, the signal generator’s CW ramp provides a repetitive 0V to 10V ramp output to the rear
panel HORIZ OUT BNC connector and AUX I/O connector. The CW ramp is used to drive a scalar analyzer display.
To go to the CW Ramp Menu (below) from the CW
menu, press CW Ramp Menu .
This menu lets you set the ramp speed and turn the
CW ramp on/off.
To set ramp speed, press Sweep Time . The sweep
time parameter opens for editing. Edit the current
sweep time using the cursor control key or rotary
data knob or enter a new sweep time using the key
pad and appropriate termination key. The sweep
time entered must be in the range of 30 ms to
99 sec. To close the open sweep time parameter
when you are done, press Sweep Time or make another menu selection.
Press CW Ramp to turn the CW ramp on. While
the CW ramp is on, the message CW Ramp appears on the right side of frequency title bar on all
CW menus.
Press Previous Menu to return to the CW Menu
display.
681XXC OM
3-25
LOCAL (FRONT
PANEL) OPERATION
3-8
SWEEP FREQUENCY
OPERATION
SWEEP FREQUENCY
OPERATION
The signal generator can generate broad (full range) and narrow band
sweeps across the frequency range of the instrument. The 681XXC has
four sweep frequency modes—analog sweep, step sweep, manual
sweep, and list sweep. Descriptions and operating instructions for the
analog, step, and manual sweep frequency modes begin on this page.
List sweep frequency mode descriptions and operating instructions begin on page 3-41. Use the Analog Sweep, Step Sweep, Manual Sweep,
and List Sweep Frequency Mode menu maps (Chapter 4, Figures 4-3,
4-4, 4-5, and 4-6) to follow the menu sequences.
Analog Sweep
Mode
In analog sweep frequency mode, the signal generator’s output frequency is swept between selected
start and stop frequencies. Sweep width can be set
from 1 MHz to the full frequency range of the signal
generator. Sweep time can be set for any time in the
range of 30 ms to 99 sec. The lower frequency limit
for analog sweeps is 10 MHz.
When the sweep width of the analog sweep is
>100 MHz, the sweep is phase-lock corrected at both
the start and stop frequencies and at each bandswitch point. When the sweep width is £100 MHz,
only the center frequency of the sweep is phase-lock
corrected.
Selecting
Analog Sweep
Mode
To place the 681XXC in analog sweep frequency
mode, press the main menu key
CW/SWEEP
SELECT
At the resulting menu display, press Analog . The
Analog Sweep Menu (below) is then displayed.
3-26
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
This menu lets you perform the following:
q
q
q
q
Setting Sweep
Time
Select a sweep range (edit the sweep start and
stop frequency parameters).
Go to the sweep ramp menu (set the sweep
time and select a sweep trigger).
Select an output power level for the sweep.
Go to the alternate sweep menu.
To go to the Analog Sweep Ramp menu (below) from
the Analog Sweep menu, press Sweep Ramp .
This menu lets you set the sweep time and go to the
trigger menu.
To open the sweep time parameter for editing, press
Sweep Time . Edit the current sweep time using the
cursor control key or the rotary data knob or enter a
new sweep time using the key pad and appropriate
termination key. To close the open sweep time parameter once you have set the desired time, press
Sweep Time or make another menu selection.
To go to the Analog Sweep Trigger menu from this
menu, press Trigger Menu . Sweep trigger is described on the next page.
Press Previous Menu to return to the Analog Sweep
Menu display.
681XXC OM
3-27
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Selecting a
Sweep
Trigger
There are three modes of sweep triggering provided
for analog sweep and step sweep—automatic, external, and single. The sweep trigger is selectable from
the trigger menu. The following is a description of
each mode.
q
q
q
Auto (Automatic)–The sweep continually
sweeps from its start frequency to its stop frequency with optimal retrace time.
External–The sweep recurs when triggered by
an external TTL-compatible clock pulse to the
rear panel AUX I/O connector.
Single–A single sweep starts when the trigger
key is pressed. If a sweep is in progress when
the key is pressed, it aborts and resets.
To go to the Sweep Trigger Menu (below) from the
Analog Sweep Ramp menu, press Trigger Menu .
To select a sweep trigger mode, press its menu softkey. A message showing the sweep trigger mode selected appears on the right side of frequency title
bar. When you are finished, press Previous Menu to
return to the Analog Sweep Ramp Menu display.
If you select the single sweep trigger mode, the
menu display adds the menu soft-key Trig . Pressing Trig starts a single sweep. If a single sweep is
in progress, pressing Trig causes the sweep to abort
and reset.
3-28
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Step Sweep
Mode
In step sweep frequency mode, the output frequency
changes in discrete, synthesized steps between
selected start and stop frequencies. Step sweeps can
be from a low frequency to a high frequency or from
a high frequency to a low frequency. Step sweeps
can be selected to be linear or logarithmic. Sweep
width can be set from 1 kHz (0.1 Hz with Option 11)
to the full frequency range of the instrument.
The step size or number of steps between the start
and stop frequencies, the dwell time-per-step, the
sweep time, and the type of step sweep (linear or
logarithmic) and sweep trigger are controllable from
step sweep menus.
Selecting
Step Sweep
Mode
To place the 681XXC in step sweep frequency mode,
press the main menu key
CW/SWEEP
SELECT
At the resulting menu display, press Step . The Step
Sweep Menu (below) is then displayed.
This menu lets you perform the following:
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q
q
q
Setting Step
Size, Dwell
Time, and
Sweep Time
681XXC OM
Select a sweep range (edit the sweep start and
stop frequency parameters).
Go to the sweep ramp menu (set the dwell
time-per-step, the step size or number of steps,
set the sweep time, select log or linear sweep,
and select a sweep trigger).
Select an output power level for the sweep.
Go to the alternate sweep menu.
In linear step sweep, the sweep is linearly incremented (or decremented) by the step size from the
start frequency to the stop frequency. There are two
ways to set the size of each step of the linear step
sweep—set the step size or set the number of steps.
3-29
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
The step size range is 1 kHz (0.1 Hz with Option 11)
to the full frequency range of the signal generator;
the number of steps range is 1 to 10,000. If the step
size does not divide into the frequency range, the
last step is truncated.
In logarithmic step sweep, step size increases logarithmically with frequency and is determined by a
logarithmic curve fitted between the sweep start
and stop frequencies and the number of steps. The
number of steps range is 1 to 10,000.
The dwell time-per-step of the step sweep can be set
for any time in the range of 1 ms to 99 sec. When
dwell-time-per-step and step size or number of steps
is set, the sweep time equals dwell-time-per-step
times the number of steps plus the total phaselocking time for all step frequencies. If sweep time is
set, then dwell-time-per-step is the result of the
sweep time divided by the number of steps. In this
case, the resultant minimum dwell time must be
³10 ms to allow for phase-locking of each step frequency. The sweep time of the step sweep can be set
for any time in the range of 20 ms to 99 sec.
To go to the Step Sweep Ramp menu (below) from
the Step Sweep menu, press Sweep Ramp .
RANGE
This error message is displayed
when (1) the step size value entered
is greater than the sweep range, (2)
the number of steps entered results
in a step size of less than 1 kHz
(0.1 Hz with Option 11), or (3) the
sweep time entered divided by the
number of steps entered results in a
dwell time of <10 ms. Entering valid
values will clear the error.
3-30
This menu lets you set the dwell time, the step size
in linear step sweep, the number of steps, and go to
the additional step sweep ramp menu (to set the
sweep time, select log or linear sweep, and select a
sweep trigger).
Press Dwell Time to open the dwell time-per-step
parameter.
Press Step Size to open the step size parameter.
Press Num of Steps to open the number of steps
parameter.
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Open the parameter you wish to change, then edit
the current value using the cursor control key or the
rotary data knob or enter a new value using the key
pad and appropriate termination key. When you
have finished setting the open parameter, close it by
pressing its menu soft-key or make another menu
selection.
Press More to go to the Additional Step Sweep
Ramp menu.
Press Previous Menu to return to the Step Sweep
Menu display.
Additional Step Sweep Ramp Menu
When you press More, the Additional Step Sweep
Ramp Menu (below) is displayed.
This menu lets you set the sweep time, select logarithmic or linear step sweep, and go to the trigger
menu.
To open the sweep time parameter for editing, press
Sweep Time . Edit the current sweep time using the
cursor control key or the rotary data knob or enter a
new sweep time using the keypad and appropriate
terminator key. To close the open sweep time parameter once you have set the desired time, press
Sweep Time or make another menu selection.
Press Log/Linear to select logarithmic or linear step
sweep operation. The soft-key label is highlighted
(in reverse video) to reflect your selection.
Press Trigger Menu to go to the Step Sweep Trigger
menu. The trigger menu lets you select a sweep trigger (previously described on page 3-28).
Press Previous Menu to return to the Step Sweep
Ramp Menu display.
681XXC OM
3-31
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Manual
Sweep Mode
In manual sweep frequency mode, the output frequency can be manually tuned in phase-locked steps
between the selected start and stop frequencies using the rotary data knob. As the knob is turned, the
current output frequency is displayed on the data
display as Fm. The step size or number of steps between the start and stop frequencies are controllable from the manual sweep menu. The step size
range is 1 kHz (0.1 Hz with Option 11) to the full
frequency range of the instrument; the number of
steps range is 1 to 10,000.
Selecting
Manual
Sweep Mode
To place the 681XXC in manual sweep frequency
mode, press the main menu key
CW/SWEEP
SELECT
At the resulting menu display, press Manual . The
Manual Sweep Menu (below) is then displayed.
This menu lets you perform the following:
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q
3-32
Select a sweep range (edit the start and stop
frequency parameters).
Set the step size or number of steps (previously
described on page 3-30).
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Selecting a
Sweep Range
Selecting a sweep range involves choosing a start
and a stop frequency for the frequency sweep. The
sweep range selection process is identical for the
analog sweep, step sweep, and manual sweep frequency modes. You can select a frequency sweep
range as follows:
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q
q
Editing the current start and stop frequency
parameter values.
Entering new start and stop frequency parameter values.
Selecting one of the preset sweep range parameters (F1-F2, F3-F4, F5-dF, or F6-dF).
Editing the Current Start / Stop Frequencies
To edit the current sweep range, open either the
start or stop frequency parameter. In the display
above, Edit F1 opens the start frequency parameter; Edit F2 opens the stop frequency parameter.
RANGE
This error message is displayed
when (1) the analog sweep start frequency entered is greater than the
stop frequency, or (2) the dF value
entered results in a sweep outside
the range of the 681XXC. Entering
valid values will clear the error.
Edit the open frequency parameter using the cursor
control key or the rotary data knob. When you are
finished, close the open parameter by pressing its
menu edit soft-key or by making another menu selection.
Entering New Start / Stop Frequencies
To enter a new frequency sweep range, open either
the start or stop frequency parameter (press Edit F1
or Edit F2 ).
Enter a new frequency using the keypad and appropriate terminator key. When you are finished, close
the open parameter by pressing its menu edit softkey or by making another menu selection.
681XXC OM
3-33
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Selecting a Preset Sweep Range
There are four preset sweep range parameters, selectable in the analog sweep, step sweep, and manual sweep frequency modes. The following is a
description of each preset sweep range.
q
q
q
q
F1-F2–provides a frequency sweep between the
start frequency, F1, and the stop frequency, F2.
F3-F4–provides a frequency sweep between the
start frequency, F3, and the stop frequency, F4.
F5-dF–provides a symmetrical frequency
sweep about the center frequency, F5. The
sweep width is determined by the dF frequency
parameter.
F6-dF–provides a symmetrical frequency
sweep about the center frequency, F6. The
sweep width is determined by the dF frequency
parameter.
To select one of the preset sweep ranges from any
sweep frequency mode menu, press the main menu
key
FREQUENCY
CONTROL
The Sweep Frequency Control Menu (below) is displayed.
This menu lets you perform the following:
q
q
q
q
3-34
Select a full range sweep (Fmin–Fmax) or one
of the preset sweep ranges for the sweep frequency mode.
Select the frequency parameters for each preset sweep range.
Select an output power level for the sweep.
Go to the marker list menu (analog and step
sweep frequency modes only).
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Setting a Preset Sweep Range–At the menu, select the sweep range (F1-F2, F3-F4, F5-dF, or F6-dF)
that you wish to set. The menu then displays the
current frequency parameters for the selected sweep
range. Now, use the menu edit soft-keys to open the
frequency parameters for editing.
Edit the current frequency parameters or enter new
frequency parameter values for the sweep range. To
close the open frequency parameter when you are
finished, press its menu edit soft-key or make another menu selection.
You can set all the preset sweep ranges in this manner.
Selecting a
Power Level
While in a sweep frequency mode, you can edit the
current output power level or enter a new output
power level for the frequency sweep.
Editing the Current Power Level
Press Edit L1 to open the power level parameter,
then edit the current power level using the cursor
control key or rotary data knob. To close the open
power level parameter, press Edit L1 or make another menu selection.
Entering a New Power Level
Press Edit L1 to open the power level parameter,
then enter the new power level using the keypad
and appropriate terminator key. To close the open
power level parameter, press Edit L1 or make another menu selection.
NOTE
You can also select any of the preset
power levels for a frequency sweep or a
power level step for analog and step
sweeps. For instructions, refer to paragraphs 3-9 (Fixed Power Level Operation)
and 3-10 (Power Level Sweep Operation).
681XXC OM
3-35
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Frequency
Markers
The signal generator provides up to 20 independent,
pre-settable markers, F0-F9 and M0-M9, that can
be used in the analog and step sweep frequency
modes for precise frequency identification. Marker
frequency accuracy is the same as sweep frequency
accuracy. The markers are visible on a CRT display.
The 681XXC generates two types of markers.
q
q
Video Marker–produces a pulse on a CRT
display at each marker frequency. The video
marker is either a +5V or a –5V pulse at the
rear panel. The polarity of the video marker
pulse is selectable from a system configuration
menu.
Intensity Marker–produces an intensified
dot on a CRT display at each marker frequency. They are obtained from a momentary
dwell during the sweep at each marker frequency. Intensity markers are only available in
the analog sweep frequency mode at sweep
times of <1 second.
To output markers during a sweep you must first select (tag) the marker frequencies from the Marker
List menu, then turn on the marker output. To go to
the Marker List menu from an analog or step sweep
frequency menu, press
FREQUENCY
CONTROL
The Sweep Frequency Control Menu (below) is displayed.
To go to the Marker List menu from this menu,
press Marker List . The Marker List Menu (next
page) is displayed. This menu lets you tag or edit
marker list frequencies and turn the markers on/off.
3-36
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Use the cursor control key to select a frequency
parameter from the marker list. The selected frequency parameter is highlighted in reverse video
and displayed in full below the marker list.
Editing a Marker List Frequency
If you want to change a selected marker list frequency parameter’s value, press Edit to open the
frequency parameter, then edit the current frequency or enter a new frequency.
Tagging a Marker List Frequency
Only frequencies on the marker list that have been
tagged can be output as markers during a sweep.
Press Tag to tag a selected frequency parameter
(place an m in front of it). If a frequency parameter
is already tagged, pressing Tag will untag it (remove the m).
Activating Markers
The soft-keys Video Markers and Intensity Markers
toggle the markers on and off.
Video Markers–To output the tagged marker frequencies as video markers during an analog or step
sweep, press Video Markers . Video markers will be
displayed on the CRT for all tagged marker frequencies that are within the sweep frequency range.
Intensity Markers–(only available in analog sweep
frequency mode) To output the tagged marker frequencies as intensity markers during an analog
sweep, press Intensity Markers . Intensity markers
will be displayed on the CRT for all tagged marker
frequencies that are within the analog sweep frequency range.
Press Previous Menu to return to the Sweep Frequency Control Menu display.
681XXC OM
3-37
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Selecting
Alternate
Sweep Mode
In alternate sweep frequency mode, the signal generator’s output frequency sweeps alternately between any two sweep ranges in analog sweep or any
two sweep ranges in step sweep. The process of selecting and activating the alternate sweep is identical for both analog and step sweep frequency modes.
To select the alternate sweep mode for analog
sweeps, start with the Analog Sweep Menu display;
to select the alternate sweep mode for step sweeps,
start with the Step Sweep Menu display (below).
To go to the Alternate Sweep Menu (below) from the
Step Sweep menu, press Alt Swp Menu .
This menu lets you perform the following:
q
q
q
Turn the alternate sweep mode on/off.
Go to the alternate range menu to select a
sweep range for the alternate sweep.
Go to the alternate level menu to select a
power level for the alternate sweep.
Activating the Alternate Sweep
The Alternate Sweep menu soft-key Alt Sweep toggles the alternate sweep mode on and off.
Press Alt Sweep to turn on the alternate sweep
mode. Notice that the Alternate Sweep menu (on
the following page) changes to show that the alternate sweep is now active.
3-38
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Now, press Previous Menu to return to the Step
Sweep Menu display (or the Analog Sweep Menu
display if operating in analog sweep frequency
mode).
Notice the changes to the Step Sweep Menu display
(below). These changes indicate that the alternate
sweep frequency mode is active.
Now, press Alt Swp Menu to return to the Alternate
Sweep Menu display.
Selecting an Alternate Sweep Range
To go to the Alternate Range Menu (below) from the
Alternate Sweep menu, press Alt Range .
Select the alternate sweep range (Full, F1-F2, F3-F4,
F5-dF, or F6-dF). The menu then displays the current frequency parameters for the selected sweep
range. If you wish to change a frequency parameter,
use the menu edit soft-key to open the parameter,
then edit it.
681XXC OM
3-39
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
When you are done selecting the alternate sweep
range, press Previous Menu to return to the Alternate Sweep Menu display.
Selecting an Alternate Sweep Power Level
To go to the Alternate Level Menu (below) from the
Alternate Sweep menu, press Alt Level .
Select the power level for the alternate sweep range
(L0, L1, L2, L3, or L4). The menu then displays the
current level parameter for the selected power level.
If you wish to change the level, use the menu edit
soft-key to open the parameter, then edit it.
A menu edit soft-key is also provided to let you
change the power level of the main sweep.
CAUTION
Performing alternate sweeps using power levels that cross
step attenuator switch points can cause excessive wear on
the switches and reduce the life expectancy of the step
attenuator.
When you are done selecting the power level for the
alternate sweep range and editing the power level of
the main sweep, press Previous Menu to return to
the Alternate Sweep Menu display.
3-40
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
List Sweep
Mode
In list sweep frequency mode, the output is a step
sweep of up to 2000 phase-locked, non-sequential
frequencies. Each frequency can have a different
power level setting. The list index (0 thru 1999)
identifies each frequency/power level set in the list.
The list sweep is defined by a list start index and a
list stop index.
There are four modes of sweep triggering in list
sweep—automatic, external, single, and manual.
When automatic, external, or single trigger mode is
selected, the output sweeps between the specified
list start and stop indexes, dwelling at each list index for the specified dwell time. When manual trigger mode is selected, the list start index, list stop
index, and dwell time parameter are not used. Instead, the list index is incremented or decremented
by using the front panel cursor control key. In manual trigger mode, the list index can also be incremented by using an external trigger input. Each
TTL trigger increments the list index by one.
After a reset, the list sweep defaults to manual trigger mode. The data display shows the trigger mode,
the list index, current frequency, and current power
level. The list index specifies the current location
within the list. The current frequency is preceded by
the text “Fr”. The current power level is preceded by
the text “Lv”. When automatic, external, or single
trigger mode is selected, the data display changes to
show the trigger mode and list sweep start and stop
index values only.
The list of up to 2000 frequency/power level sets is
stored in non-volatile RAM to preserve any settings
after the instrument is powered off. The list is not
stored with the other setup information in the instrument. After a master reset, the list is reset to its
default state of 2000 index entries of 5 GHz at
0 dBm.
681XXC OM
3-41
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Selecting List
Sweep Mode
To place the 681XXC in list sweep frequency mode,
press the main menu key
CW/SWEEP
SELECT
At the reulting menu display, press List . The List
Sweep Menu (below) is displayed.
This menu lets you perform the following:
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q
q
q
Go to the Edit List menus (edit list index frequency and power level parameters and insert
and delete list index entries).
Edit the list index parameter.
Calculate all list index frequency and power
level settings.
Go to the Sweep menu (set sweep start index,
stop index, and dwell time and select a sweep
trigger).
Editing the List Index
Press List Index to open the list index parameter for
editing. Edit the current list index value using the
cursor control key or rotary data knob or enter a
new value using the key pad and any terminator
key. When you have finished setting the open parameter, close it by pressing List Index or by making another menu selection.
The List Index soft-key is not the only way to
change the list index. In the list sweep mode with
manual trigger selected, each time the Ù or Ú pad of
the cursor control key is pressed the list index increments or decrements by one. The List Index soft-key
is used if a larger change in the list index is desired.
The only time the cursor control key will not change
the list index is when a different parameter, such as
frequency, power level,etc., is open. The cursor control key will then change the value of the open
parameter. Once the open parameter is closed, the
cursor control key will again change the list index.
3-42
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Performing List Calculations
The PreCalc List soft-key initiates a process that
examines every index in the list and performs all
the calculations necessary to set the frequency and
power levels. The soft-key does not have to be
pressed every time the list changes. The instrument
will perform the calculations to set the frequency
and power levels as it performs the initial list
sweep. This causes the initial list sweep to take
longer than each subsequent sweep. Using the
PreCalc List soft-key lets the initial list sweep be as
fast as each subsequent sweep. The calculations are
stored in volatile RAM and are lost at instrument
power-off.
Press PreCalc List to perform list calculations. The
soft-key image depresses to show that calculations
are in progress. When the calculations are completed, the soft-key returns to normal appearance.
Editing the
List
List editing consists of editing list index frequency
and power level parameters and inserting and deleting list index entries.
To go to the Edit List Menu (below) from the List
Sweep menu, press Edit List .
This menu lets you perform the following:
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q
q
681XXC OM
Go to the List Frequency Edit menu (edit list
index frequency parameters).
Go to the List Power Edit menu (edit list index
power level parameters).
Go to the Additional Edit List menu (insert
and delete list index entries).
3-43
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
List Frequency Edit–to go to the List Frequency
Edit Menu (below), press Edit Freq . This menu lets
you scroll through the list frequencies and edit selected frequencies.
The menu displays a total of 20 frequencies. The index range of the displayed frequencies is shown at
the top of the list. Use the cursor control key to select a frequency from the list. The selected frequency is highlighted in reverse video and displayed
in full below the frequency list.
Press Edit to edit the highlighted frequency or enter a new frequency.
Press Page Up to scroll the displayed frequencies
to the next 20 in the list. Press Page Down to scroll
the displayed frequencies to the previous 20 in the
list.
Press Previous Menu to return to the Edit List
Menu display.
List Power Edit–to go to the List Power Edit
Menu (below) from the Edit List menu, press
Edit Power . This menu lets you scroll through the
list power levels and edit selected power levels.
The menu displays a total of 10 power levels. Use
the cursor control key to select a power level from
the list. The selected power level is highlighted in
reverse video and displayed in full below the power
level list.
3-44
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Press Edit to edit the highlighted power level or enter a new power level.
Press Page Up to scroll the displayed power levels
to the next 10 in the list. Press Page Down to scroll
the displayed power levels to the previous 10 in the
list.
Press Previous Menu to return to the Edit List
Menu display.
Additional Edit List Menu
At the Edit List menu, press More to go to the Additional Edit List Menu (below).
This menu lets you insert and delete entries from
the list.
Press Insert Entry to insert the default frequency
(5 GHz) and power level (0 dBm) at the current list
index.
NOTE
Because the list size is fixed, inserting a
new index will cause the last index to be
lost. Whatever frequency and power level
are at list index 1999 will be deleted and
cannot be recovered.
Press Delete Entry to delete the current list index.
NOTE
Delete entry cannot be undone. Once a
list index is deleted, the only recovery is
to re-enter the deleted frequency and
power level.
Press Previous Menu to return to the main Edit
List Menu display.
681XXC OM
3-45
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Copying Data from the CW Menu
An easy method of entering frequency and power
level information into the current list index is to
copy the data from the CW menu.
Fisrt, go to the main List Sweep menu and press the
List Index soft-key to open the list index parameter.
Then, select the list index that you want the data to
be added to.
Next, press the CW soft-key. The CW Menu (below)
is displayed.
Use the Edit F1 and Edit L1 soft-keys to set the
frequency and power level to the values you wish to
enter into the current list index.
Press the Copy to List soft-key to copy the data to
the current list index.
Once the frequency and power level information has
been entered into the current list index, the list index is incremented by one.
Selecting a
List Sweep
Range
Selecting a sweep range involves choosing a start
index and stop index for the list sweep.
To go to the Sweep Menu (below) from the main List
Sweep menu, press Sweep Menu .
This menu lets you select a list sweep range, set the
dwell-time-per-step, and go to the trigger menu.
3-46
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
Press Start Index to open the list sweep start index
parameter.
Press Stop Index to open the list sweep stop index
parameter.
Press Dwell Time to open the dwell-time-per-step
parameter.
Open the parameter you wish to change, then edit
the current value using the cursor control key or rotary data knob or enter a new value using the key
pad and appropriate terminator key. When you have
finished setting the open parameter, close it by
pressing its menu soft-key or by making another
menu selection.
To go to the List Sweep Trigger menu from this
menu, press Trigger . The trigger menu lets you select a list sweep trigger.
Press Previous Menu to return to the main List
Sweep Menu display.
Selecting a
List Sweep
Trigger
There are four modes of sweep triggering in list
sweep frequency mode, each selectable from the
trigger menu. The following is a description of each
mode
q
q
q
q
681XXC OM
Auto (Automatic)–The output sweeps between the specified list start and stop indexes,
dwelling at each list index for the specified
dwell time.
External–The output sweep recurs when triggered by an external TTL-compatible clock
pulse to the rear panel AUX I/O connector.
Single (Trig)–A single output sweep starts
when the trigger key is pressed. If a sweep is
in progress when the key is pressed, it aborts
and resets.
Manual–(list sweep default trigger mode) The
list index is incremented or decremented by
using the front panel cursor control key. The
list index can also be incremented using an external trigger input. Each trigger increments
the list index by one.
3-47
LOCAL (FRONT
PANEL) OPERATION
SWEEP FREQUENCY
OPERATION
To go to the List Sweep Trigger Menu (below) from
the Sweep menu, press Trigger .
To select a sweep trigger mode, press its menu softkey. A message showing the trigger mode selected
appears on the right side of the frequency title bar.
When you are finished, press Previous Menu to
return to the Sweep Menu display.
If you select the single trigger mode, the Single
soft-key is replaced by the Trig soft-key. Pressing
Trig starts a single sweep. If a single sweep is in
progress, pressing Trig causes the sweep to abort
and reset.
NOTE
With Auto trigger selected and the dwelltime-per-step set to a small value, display
updating slows down. This ensures that
sweep speed is not adversely affected. Because of this potential display update
slow down, when leaving list sweep mode
with auto trigger selected for another
mode, Auto trigger is automatically
turned off and Manual trigger is selected.
Thus, when list sweep mode is entered,
the display updating will be back to normal speed.
3-48
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
3-9
FIXED POWER LEVEL
OPERATION
FIXED POWER
LEVEL OPERATION
The signal generator provides leveled output power over a maximum
range of up to 33 dB (up to 149 dB with Option 2) for CW and sweep
frequency operations. Units with Option 15A provide leveled output
power over a maximum range of up to 27 dB (up to 141 dB with Option 2). The following paragraphs describe how to place the signal generator in fixed (non-swept) power level mode, select a power level for
output, select logarithmic or linear units, and activate level offset. Use
the Fixed (Non-Swept) Power Level Mode menu map (Chapter 4, Figure 4-7) to follow the menu sequences.
Selecting
Fixed Power
Level Mode
To place the 681XXC in a fixed power level mode
from a CW or sweep (analog, step, or manual) frequency menu, press the main menu key
LEVEL/ALC
SELECT
At the resulting menu display, press Level . The
Level Menu (below) is displayed.
This menu lets you perform the following:
q
q
q
Selecting a
Power Level
Edit the power level parameter.
Edit the level offset parameter.
Turn level offset on/off.
There are several ways to select a power level for
output. You can (1) edit the current power level, (2)
enter a new power level, or (3) select one of the 10
preset power level parameters.
Editing the Current Power Level
Press Edit L1 to open the power level parameter,
then edit the current power level using the cursor
control key or the rotary data knob. To close the
open power level parameter, press Edit L1 or make
another menu selection.
Entering a New Power Level
Press Edit L1 to open the power level parameter,
then enter the new power level using the keypad
681XXC OM
3-49
LOCAL (FRONT
PANEL) OPERATION
NOTE
When Linear power level units are
selected, use the following terminator keys for power level data entries:
GHz / Sec / dBm for V
MHz / ms / dB for mV
kHz / ms / STEPS for mV
FIXED POWER
LEVEL OPERATION
and appropriate terminator key. To close the open
power level parameter, press Edit L1 or make another menu selection.
Selecting a Preset Power Level
To select one of the preset power levels for output,
press the main menu key
LEVEL
CONTROL
The Level Control menu (below) is displayed.
This menu lets you perform the following:
q
q
q
Select preset power levels L0, L1, L2, L3, or L4
for output.
Go to the Level List menu.
Go to the Tagged Levels menu.
Press Log/Linear to select power level units. When
Log is selected, units are in dBm; when Linear is selected, units are in mV. The soft-key label is highlighted (in reverse video) to reflect your selection.
Level List– To go to the Level List menu (below),
press Level List .
This menu lets you select a power level from the list
to tag, edit, or output.
3-50
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
FIXED POWER
LEVEL OPERATION
Use the cursor control key to select a power level
from the level list. The selected power level is highlighted in reverse video and displayed in full below
the level list.
Press Tag to mark a selected power level (place an
L in front of it). If a power level is already tagged,
pressing Tag will untag it (remove the L). Tagging
selected power levels lets you quickly switch between them using the scan keys of the Tagged Levels menu.
Press Edit to edit the selected power level or enter
a new power level.
Press Output Level to output the selected level.
This power level is output until you select another
level from the list and press Output Level . On the
level list, the output power level selection is marked
by a black square or, if tagged, an L highlighted in
reverse video.
When you are finished , press Previous Menu to return to the Level Control Menu display.
Scanning Tagged Levels–To go to the Tagged Levels menu (shown below) from the Level Control
menu, press Tag Lvl Menu .
This menu lets you select the tagged power levels
for output using the Scan Up and Scan Dn keys.
Return to the Level Control Menu display by pressing Previous Menu .
681XXC OM
3-51
LOCAL (FRONT
PANEL) OPERATION
FIXED POWER
LEVEL OPERATION
Level Offset
Level offset lets you compensate for a device on the
signal generator’s output that alters the RF output
power level at the point of interest. For example, the
power level at the test device may be less or more
than the displayed power level because of the loss
through an external transmission line or the gain of
an amplifier located between the 681XXC RF output
and the test device. Using the level offset function,
you can apply a constant to the displayed power
level that compensates for this loss or gain. The displayed power level will then reflect the actual power
level at the test device.
To enter an offset value and apply it to the displayed
power level, go to the Level Menu. Then press
Edit Offset . As shown in the following menu, this
opens the offset parameter for editing.
OFFSET
When Offset is selected ON, this
status message is displayed on all
menu displays to remind the operator that a constant (offset) has been
applied to the displayed power
level.
3-52
Edit the current offset value using the cursor control key or rotary data knob or enter a new offset
value using the keypad and appropriate terminator
key. To close the open offset parameter when you are
done, press Edit Offset or make another menu selection.
Press Offset to apply the offset to the displayed
power level. In this example, a+2.00 dB offset is applied to L1. L1 then displays a power level of
+2.00 dBm.
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
3-10
POWER LEVEL SWEEP
OPERATION
POWER LEVEL
SWEEP OPERATION
The signal generator provides leveled output power sweeps at CW frequencies and in conjunction with frequency sweeps (analog and step).
Power level sweeps can be from a high level to a low level or vice
versa. Power level sweeps can be selected to be linear or logarithmic.
The following paragraphs provide descriptions and operating instructions for the CW power sweep mode and the sweep frequency/ step
power modes. Use the CW Power Sweep Mode and Sweep Frequency/
Step Power Mode menu maps (Chapter 4, Figures 4-8 and 4-9) to follow the menu sequences.
CAUTION
Performing power level sweeps that cross step attenuator
switch points can cause excessive wear on the switches and
reduce the life expectancy of the step attenuator.
Selecting CW
Power Sweep
Mode
In the CW power sweep mode, output power steps
between any two power levels at a single CW frequency. Available menus let you set or select the
sweep range, the step size, the dwell-time-per-step,
and the type of power sweep (linear or logarithmic)
and sweep trigger.
To place the 681XXC in a CW power sweep mode
from a CW frequency menu, press the main menu
key
LEVEL/ALC
SELECT
At the resulting menu display, press Lvl Swp . The
CW Level Sweep Menu (below) is displayed.
This menu lets you perform the following:
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q
681XXC OM
Select a power level sweep range (edit the
sweep start and stop power level parameters).
Go to the sweep ramp menu (set the dwelltime-per-step, the step size or number of steps,
and select a sweep trigger).
3-53
LOCAL (FRONT
PANEL) OPERATION
POWER LEVEL
SWEEP OPERATION
Setting CW
Power Sweep
Step Size and
Dwell Time
There are two ways to set the size of each step of the
CW power sweep—set the step size or set the
number of steps. The step size range is 0.01 dB
(Log) or 0.001 mV (Linear) to the full power range of
the instrument; the number of steps range is 1 to
10,000. The dwell-time-per-step of the CW power
sweep can be set for any time in the range of 1 ms to
99 sec. If the sweep crosses a step attenuator setting, there will be a sweep dwell of approximately
20 ms to allow setting of the step attenuator. The
step size and dwell-time-per-step are set from the
CW Level Sweep Ramp menu (below).
To go to the CW Level Sweep Ramp Menu from the
CW Level Sweep menu, press Sweep Ramp .
This menu lets you set the dwell time, the step size,
the number of steps, and go to the trigger menu.
Press Dwell Time to open the dwell-time-per-step
parameter.
RANGE
This error message is displayed
when (1) the step size value entered
is greater than the level sweep
range or (2) the number of steps entered results in a step size of less
than 0.01 dB (Log) or 0.001 mV
(Linear). Entering a valid step size
will clear the error.
Press Step Size to open the step size parameter.
Press Num of Steps to open the number of steps
parameter.
Open the parameter you wish to change, then edit
the current value using the cursor control key or rotary data knob or enter a new value using the key
pad and appropriate termination key. When you
have finished setting the open parameter, close it by
pressing its menu soft-key or by making another
menu selection.
To go to the CW Level Sweep Trigger menu from
this menu, press Trigger Menu . The trigger menu is
described on the following page.
Press Previous Menu to return to the CW Level
Sweep Menu display.
3-54
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
POWER LEVEL
SWEEP OPERATION
Selecting a
CW Power
Sweep
Trigger
There are three modes of triggering provided for the
CW power sweep—automatic, external, and single.
The sweep trigger is selectable from the CW Level
Sweep Trigger menu. The following is a description
of each trigger mode.
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q
q
Auto (Automatic)–The CW power sweep continually sweeps from its start power level to its
stop power level with optimal retrace time.
External–The CW power sweep recurs when
triggered by an external TTL-compatible clock
pulse to the rear panel AUX I/O connector.
Single–A single CW power sweep starts when
the trigger key is pressed. If a sweep is in progress when the key is pressed, it aborts and resets.
To go to the CW Level Sweep Trigger Menu (below)
from the CW Level Sweep Ramp menu, press
Trigger Menu .
To select a CW power sweep trigger mode, press its
menu soft-key. A message showing the CW power
sweep trigger mode selected appears on the right
side of the level mode title bar .
If you select the single sweep trigger mode, the
menu display changes, adding the menu soft-key
labeled Trig . Pressing Trig starts a single CW
power sweep. If a single CW power sweep is in progress, pressing Trig causes the sweep to abort and
reset.
Press Previous Menu to return to the CW Level
Sweep Ramp Menu display.
681XXC OM
3-55
LOCAL (FRONT
PANEL) OPERATION
POWER LEVEL
SWEEP OPERATION
Selecting a
Power Level
Sweep Range
Selecting a power level sweep range consists of
choosing a start and stop level for the power level
sweep. The power level sweep range selection process is identical for all power level sweep modes
—CW power sweep, analog sweep frequency/step
power, and step sweep frequency/step power. You
can select a power level sweep range as follows:
q
q
q
Edit the current start and stop power level
parameter values.
Enter new start and stop power level parameter values.
Select one of the preset power level sweep
range parameters (L1-L2, L3-L4, L5-L6, L7-L8,
or L9-L0).
Editing the Current Start / Stop Power Levels
To edit the current power level sweep range, start
by opening either the start or stop power level parameter (in the display above, Edit L1 opens the
start power level parameter; Edit L2 opens the stop
power level parameter).
Edit the open power level parameter using the cursor control key or the rotary data knob. When you
are finished, close the open parameter by pressing
its menu edit soft-key or by making another menu
selection.
NOTE
When Linear power level sweep is
selected, use the following terminator keys for power level data entries:
GHz / Sec / dBm for V
MHz / ms / dB for mV
kHz / ms / STEPS for mV
3-56
Entering New Start / Stop Power Levels
To enter a new power level sweep range start by
opening either the start or stop power level parameters (press Edit L1 or Edit L2 ).
Enter a new power level using the keypad and appropriate terminator key. When you are finished,
close the open parameter by pressing its menu edit
soft-key or by making another menu selection.
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
POWER LEVEL
SWEEP OPERATION
Selecting a Preset Power Level Sweep Range
There are five preset power level sweep range parameters selectable in the power level sweep modes.
These preset power level sweep range parameters
are L1-L2, L3-L4, L5-L6, L7-L8, and L9-L0.
To select one of the preset power level sweep ranges
from a Level Sweep menu, press the main menu key
LEVEL
CONTROL
The Level Sweep Control Menu (below) is displayed.
In addition to letting you select one of the preset
sweep ranges for the power level sweep, this menu
lets you select logarithmic or linear power level
sweep and set the start and stop power level parameters for each preset sweep range.
Setting a Preset Power Level Sweep Range–At
the Level Sweep Control menu, select the power
level sweep range (L1-L2, L3-L4, L5-L6, L7-L8, or
L9-L0) that you wish to set. The menu then displays
the current power level parameters for the selected
power level sweep range. Now, use the menu edit
soft-keys to open the power level parameters for editing.
Edit the current power level parameter values or
enter new power level parameter values for the
power level sweep range. To close the open power
level parameter when you are finished, press its
menu edit soft-key or make another menu selection.
Selecting Type of Power Level Sweep–Press
Log/Linear to select logarithmic or linear power
level sweep. When Log is selected, power levels are
in dBm; when Linear is selected, power levels are in
mV. The soft-key label is highlighted (in reverse
video) to reflect your selection.
681XXC OM
3-57
LOCAL (FRONT
PANEL) OPERATION
POWER LEVEL
SWEEP OPERATION
Selecting a
Sweep Frequency/Step
Power Mode
In analog sweep frequency/step power mode or step
sweep frequency/step power mode, a power level
step occurs after each frequency sweep. The power
level remains constant for the length of time required to complete each frequency sweep. Available
menus let you control the type of power level sweep
(linear or logarithmic), the power level sweep range,
and step size.
To select an analog sweep frequency/step power
mode, start with an analog sweep menu display; to
select a step sweep frequency/step power mode,
start with a step sweep menu display. Then press
the main menu key
LEVEL/ALC
SELECT
At the resulting menu display, press Lvl Swp . The
Level Sweep Menu is displayed.
This menu lets you perform the following:
q
q
Select a power level sweep range (edit the
sweep start and stop power level parameters).
Go to the sweep ramp menu (set the step size
or number of steps).
NOTE
To select logarithmic or linear power level
sweep or to select a power level sweep
range, refer to the procedures on pages
3-56 and 3-57.
3-58
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
POWER LEVEL
SWEEP OPERATION
Setting Power
Level Step
Size
There are two ways to set the step size of the power
level step that occurs after each frequency sweep
—set the step size or set the number of steps. The
step size range is 0.01 dB (Log) or 0.001 mV (Linear)
to the full power range of the ssignal generator; the
number of steps range is 1 to 10,000. The power
level step size is set from the level sweep ramp
menu.
To go to the Level Sweep Ramp Menu (below) from
the Level Sweep menu, press Sweep Ramp .
This menu lets you set the step size and the number
of steps.
Press Step Size to open the step size parameter.
RANGE
This error message is displayed
when (1) the step size value entered
is greater than the level sweep
range or (2) the number of steps entered results in a step size of less
than 0.01 dB (Log) or 0.001 mV
(Linear). Entering a valid step size
will clear the error.
Press Num of Steps to open the number of steps parameter.
Open the parameter you wish to change, then edit
the current value using the cursor control key or rotary data knob or enter a new value using the keypad and appropriate termination key. When you
have finished setting the open parameter, close it by
pressing its menu soft-key or by making another
menu selection.
Press Previous Menu to return to the Level Sweep
Menu display.
681XXC OM
3-59
LOCAL (FRONT
PANEL) OPERATION
3-11
LEVELING
OPERATIONS
LEVELING
OPERATIONS
The 681XXC generates leveled output power over a maximum range of
up to 33 dB (up to 149 dB with Option 2). Instruments with Option
15A provide leveled output power over a maximum range of up to
27 dB (up to 141 dB with Option 2). An automatic level control (ALC)
system controls the amplitude and power level of the RF output. The
operator can select the ALC mode of operation—internal, external
(detector or power meter), or fixed gain (ALC off). In addition, the signal generator provides (1) an ALC power slope function that provides
compensation for high frequency system or cable losses, (2) a decouple
function that allows decoupling of the step attenuator (if equipped)
from the ALC system, and (3) a user level (flatness correction) calibration function that provides for calibrating out path variations with frequency in a test setup.
The following paragraphs provide descriptions and operating instructions for the power leveling modes and functions. Use the Leveling
Modes menu map (Chapter 4, Figure 4-10) to follow the menu sequences.
Selecting a
Leveling
Mode
The ALC system is a feedback control system, in
which the output power is measured at a detector
and compared with the expected power level. If the
output and desired power levels do not equal, the
ALC adjusts the power output until they do. The
feedback signal can be provided by either the internal detector or an external detector or power meter.
Alternatively, the output power can be set to a fixed
level without using the normal feedback (ALC off).
The ALC mode menu lets you make the selection of
a leveling mode.
To go to the ALC Mode menu, first press the main
menu key
LEVEL/ALC
SELECT
At the Level/ALC Select Menu display, press
ALC Mode . The ALC Mode Menu (below) is
displayed.
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LEVELING
OPERATIONS
The ALC Mode menu lets you perform the following:
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Go to the leveling menu (select the ALC mode
of operation).
Go to the attenuation menu (decouple the
attenuator, if equipped, from the ALC system
and set the power level and attenuation).
Select either the front panel or rear panel external ALC input.
Internal Leveling
This is the normal (default) leveling mode. Output
power is sensed by the internal detector in the
681XXC. The detector output signal is fed back to
the ALC circuitry to adjust the output power level.
Internal ALC is selected from the leveling menu.
To go to the Leveling Menu from the ALC Mode
menu, press Leveling Menu . The Leveling Menu
(below) is displayed.
To select internal ALC, press Internal .
Pressing one of the other leveling menu soft-keys
External Detector , Power Meter , or Fixed Gain will
turn off internal leveling.
Press Previous Menu to return to the ALC Mode
Menu display.
External Leveling
In external leveling, the output power from the
681XXC is detected by an external detector or power
meter. The signal from the detector or power meter
is returned to the ALC circuitry. The ALC adjusts
the output power to keep the power level constant at
the point of detection. The external ALC source input is selected from the leveling menu.
681XXC OM
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LEVELING
OPERATIONS
Before going to the Leveling Menu from the ALC
Mode menu, select whether the external ALC signal
is to be connected to the front- or rear-panel EXT
ALC IN connector.
At the ALC Mode menu, press Ext ALC Front to select front panel input, or Ext ALC Rear to select
rear panel input.
Now, press Leveling Menu to go to the Leveling
Menu (below).
Next, select the type of external sensor you are using to detect the output power.
To select the external ALC input from an external
detector, press External Detector .
To select the external ALC input from a power meter, press Power Meter .
After you have made the external ALC input connection and selected the sensor type, press
ALC Loop . The ALC Loop Menu (below) is displayed.
While monitoring the power level at the external detection point, first press Ext ALC Adj , then use the
cursor control key or rotary data knob to adjust the
external ALC signal to obtain the set power level.
To return to the Leveling Menu, press ALC Mode
then press Leveling Menu .
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LEVELING
OPERATIONS
At the Leveling menu, pressing either Internal or
Fixed Gain will turn off external leveling.
Press Previous Menu to return to the ALC Mode
Menu display.
Fixed Gain
In the fixed gain mode, the ALC is disabled. The RF
Level DAC and step attenuator (if installed) are
used to control the relative power level. Power is not
detected at any point, and the absolute power level
is uncalibrated. Fixed gain mode is selected from
the leveling menu.
Press Leveling Menu to go to the Leveling Menu.
To select fixed gain mode, press Fixed Gain .
To return to normal ALC operation, press Internal .
Press Previous Menu to return to the ALC Mode
Menu display.
681XXC OM
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LOCAL (FRONT
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LEVELING
OPERATIONS
Attenuator
Decoupling
In 681XXCs equipped with option 2 step attenuators, the ALC and attenuator work in conjunction to
provide leveled output power down to –140 dBm. In
the normal (coupled) leveling mode, when the desired power level is set, the correct combination of
ALC level and attenuator setting is determined by
the instrument firmware. In some applications, such
as receiver sensitivity testing, it is desireable to control the ALC level and attenuator setting separately
by decoupling the step attenuator from the ALC.
The ALC mode menu lets you select attenuator
decoupling.
At the ALC Mode menu, press Atten Menu . The
Attenuator Menu (below) is displayed.
This menu lets you decouple the step attenuator
from the ALC, set the power level, and set the attenuation in 10 dB steps.
NOTE
The set power level may not be
maintained when switching between attenuator coupling modes.
Press Decouple to decouple the step attenuator
from the ALC.
Press Edit L1 to open the power level parameter for
editing. Edit the current level using the cursor control key or rotary data knob or enter a new value using the key pad and appropriate termination key.
When you have finished setting the power level,
press Edit L1 to close the open parameter.
To change the attenuation setting, press Incr Atten
or Decr Attn . Pressing these soft-keys changes the
attenuation in 10 dB steps.
Press Previous Menu to return to the ALC Mode
Menu display.
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LEVELING
OPERATIONS
Power Level
ALC Power
Slope
The ALC power slope function lets you compensate
for system, cable, and waveguide variations due to
changes in frequency, by linearly increasing or decreasing power output as the frequency increases.
As shown in the following illustration, the power
slope function provides you with the ability to set
both the power slope and the pivot point. The ALC
loop menu lets you activate the ALC power slope
function.
Power
Slope
Power Slope
Pivot Point
Power at DUT
With Compensation
Power at DUT
Without Compensation
Frequency
To go to the ALC Loop Menu from the Level/ALC
Control Menu display, press ALC Loop . The ALC
Loop Menu (below) is displayed.
This menu lets you turn the power slope on or off
and edit the slope value and pivot point frequency.
681XXC OM
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LOCAL (FRONT
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LEVELING
OPERATIONS
Press Slope On/Off to activate the ALC power slope
function.
SLOPE
When Power Slope is selected ON,
this status message is displayed on
all menu displays to remind the operator that a power slope correction
has been applied to the ALC.
Press Edit Pivot to open the pivot point frequency
parameter for editing. Edit the current frequency
using the cursor control key or rotary data knob or
enter a new value using the keypad and appropriate
termination key. When you have finished setting the
open parameter, close it by pressing Edit Pivot
again or by making another menu selection.
Press Edit Slope to open the slope parameter for
editing. Edit the current slope value using the cursor control key or rotary data knob or enter a new
value using the key pad and the STEPS termination
key. When you have finished setting the open parameter, close it by pressing Edit Slope again or by
making another menu selection.
While monitoring the power level at the deviceunder-test (DUT), adjust the power slope and pivot
point to level the power at the DUT.
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LEVELING
OPERATIONS
User Cal
(User Level
Flatness
Correction)
The User Cal (user level flatness correction) function lets you calibrate out path variations with
frequency that are caused by external switching,
amplifiers, couplers, and cables in the test setup.
This is done by means of an entered power-offset
table from a GPIB power meter or calculated data.
When user level flatness correction is activated, the
set power level is delivered at the point in the test
setup where the calibration was performed. This
“flattening” of the test point power level is accomplished by summing a power-offset word (from the
power-offset table) with the signal generator’s normal power level DAC word at each frequency point.
Up to five user level flatness correction power-offset
tables from 2 to 801 frequency points/table can be
created and stored in 681XXC memory for recall.
The GPIB power meters supported are the Anritsu
Models ML2437A, ML2438A, and ML4803A and the
Hewlett-Packard Models 437B, 438A, and 70100A.
G P IB
6 8 1 X X C S IG N A L G E N E R A T O R
R F
O U T P U T
IN P U T
G P IB
S W IT C H M A T R IX ,
A M P L IF IE R S ,
C O U P L E R S , E T C .
P O W E R
M E T E R
F L A T N E S S
C O R R E C T E D
O U T P U T
D E V IC E
U N D E R
T E S T
Figure 3-4.
P O W E R
S E N S O R
Setup for Creating a Power-Offset Table (User Level Flatness Correction)
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LEVELING
OPERATIONS
Equipment Setup
To create a power-offset table for user level flatness
correction, connect the equipment (shown in Figure
3-4) as follows:
Step 1
Using a GPIB cable, connect the Power
Meter to the 681XXC.
Step 2
Calibrate the Power Meter with the
Power Sensor.
Step 3
Connect the Power Sensor to the point in
the test setup where the corrected power
level is desired.
Power Meter Model and GPIB Address
In order for the 681XXC to control the power meter,
the GPIB address and power meter model must be
selected from the Configure GPIB menu.
Press SYSTEM to go to the System Menu display.
At the System Menu display, press Config . The System Configuration Menu (below) is displayed.
Next, press GPIB . The Configure GPIB Menu (below) is displayed.
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LOCAL (FRONT
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LEVELING
OPERATIONS
At the Configure GPIB menu, press More to go to
an Additional Configure GPIB Menu (below).
Press Pwr Mtr Address to change the address of the
power meter on the GPIB (the power meter’s default
address is 13). Enter the new address, between 1
and 30, using the cursor control key or the data entry key pad and the terminator key
Hz
ns
ADRS
The new GPIB address will appear on the display.
Press Pwr Mtr Select to select the power meter
model being used. (Supported power meters are the
Anritsu ML2437A, ML2438A, and ML4803A and
Hewlett-Packard 437B, 438A, and 70100A.)
Press Previous Menu to return to the main Configure GPIB Menu display.
At the Configure GPIB menu, press Previous Menu
to return to the System Configuration Menu display.
Creating a Power-Offset Table
The 681XXC must be in CW frequency mode and
fixed (non-swept) power level mode in order to create a power-offset table for user level flatness correction.
Place the signal generator in CW frequency mode by
pressing the main menu key
CW/SWEEP
SELECT
At the resulting menu display, press CW . The
681XXC is now in CW frequency mode.
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LOCAL (FRONT
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LEVELING
OPERATIONS
Place the signal generator in a fixed power level
mode by pressing the main menu key
LEVEL/ALC
SELECT
At the resulting menu display, press Level . The
681XXC is now in fixed (non-swept) power level
mode.
At the Level Menu, press User Cal . The User Level
Cal Menu (below) is displayed.
This menu lets you perform the following:
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Create a power-offset table.
Select a measurement frequency range (edit
the start and stop frequency parameters).
Select the number of points at which correction
information is to be taken.
Apply a power-offset table to the test setup.
First, press the menu soft-key to select the poweroffset table (User 1, User 2, User 3, User 4, or User 5)
that you wish to create.
Next, set the measurement frequency range by
pressing Edit Start or Edit Stop to open the start
(Flo) or stop (Fhi) frequency parameter for editing.
Edit the current frequency using the cursor control
key or rotary data knob or enter a new value using
the keypad and appropriate termination key. When
you have finished setting the open parameter, close
it by pressing its menu edit soft-key or by making
another menu selection.
Then, select the number of frequency points at
which correction information is to be taken by pressing Edit Points to open the number-of-points
parameter for editing. Edit the current number-of
-points using the cursor control key or rotary data
knob or enter a new value using the keypad and the
STEPS termination key. (The number of points
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LEVELING
OPERATIONS
range is 2 to 801.) When you have finished setting
the open number-of-points parameter, close it by
pressing Edit Points or by making another menu
selection.
Now, press Start Cal to begin automatically taking
power level correction information at each frequency
point. During this process the menu displays the
status: Calibrating along with the current measurement frequency point.
NOTE
To terminate the measurement process at
any time before completion, press Abort .
Once the power-offset table has been created, it is
stored in non-volatile memory. The power-offset table is now ready to be applied to the test setup. Disconnect the Power Sensor and Power Meter from the
test setup.
USER 1...5
When a power-offset table is selected ON, this status message is
displayed on all menu displays to
remind the operator that user level
flatness correction has been applied
to the ALC.
Applying User Level Flatness Correction
Whenever user level flatness correction is applied to
the test setup by activating the power-offset table,
the set power level is delivered at the point where
the calibration was performed.
To activate the selected power-offset table and apply
user level flatness correction to the test setup, press
On/Off . The User Level Cal menu will display the
status: On.
To turn off the selected power-offset table and remove user level flatness correction from the test
setup, press On/Off again. The User Level Cal
menu will display the status: Off.
Entering a Power-Offset Table via GPIB
User level flatness correction can be applied to the
test setup using a power-offset table created from
calculated data and entered via the GPIB. Refer to
the 681XXC Programming Manual (P/N 1037010334) for information and instructions on creating
a power-offset table and entering it via the GPIB.
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LEVELING
OPERATIONS
Erasing the Power-Offset Tables from Memory
The power-offset tables are stored in non-volatile
memory. A master reset is required to erase the contents of the tables and reprogram them with default
data.
To perform a master reset, proceed as follows:
NOTE
The master reset function overwrites all information stored in the
non-volatile memory with default
values. This includes the nine
stored front panel setups and the
table of 2000 frequency/power level
sets used for list sweep mode.
Step 1
With the 681XXC in standby, press and
hold the RF OUTPUT ON/OFF key.
Step 2
Press the LINE OPERATE/STANDBY key
to turn the instrument on.
Step 3
When the first menu is displayed (after
the start-up display), release the RF OUTPUT ON/OFF key.
The contents of non-volatile memory have now been
erased and reprogrammed with default data.
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3-12
SIGNAL MODULATION
SIGNAL
MODULATION
The signal generator provides AM, FM, and square wave modulation
of the output signal. All modulation modes—AM, FM, and square
wave—can be active simultaneously. The following paragraphs provide
descriptions and operating instructions for each modulation mode. Use
the Amplitude Modulation Mode, Frequency Modulation Mode, and
Square Wave Modulation Mode menu maps (Chapter 4, Figures 4-11,
4-12, and 4-13) to follow the menu sequences.
Amplitude
Modulation
Operating
Modes
The signal generator has two AM operation
modes—Linear AM and Log AM. In Linear AM
mode, sensitivity is continuously variable from 0%/V
to 100%/V. The amplitude of the RF output changes
linearly as the external AM input changes.
In Log AM mode, sensitivity is continuously variable from 0 dB/V to 25 dB/V. The amplitude of the
RF output changes exponentially as the AM input
changes.
Providing
Amplitude
Modulation
To provide amplitude modulation, first set up the
external signal generator, then connect it to either
the 681XXC front or rear panel AM IN connector.
Next, press MODULATION . At the resulting menu
display, press AM . The right-most External AM
Status Menu (below) is displayed. Pressing “More”
bring up the left-most menu.
This menu contains an external AM status window
that shows the current menu selections and the
measured AM Depth. (The AM depth measurement
function measures the voltage of the external modulation signal and calculates the percentage modulation value.) This menu lets you perform the
following:
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681XXC OM
Turn AM on and off.
Select the Linear AM or Log AM operating
mode.
Set the AM Sensitivity
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LOCAL (FRONT
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SIGNAL
MODULATION
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Select the input impedance (600W or 50W) of
the input connector.
Select the input connector (front panel or rear
panel AM IN) that is connected to the external
signal source.
Press On / Off to turn AM on and off. Both the AM
status display and AM modulation status area will
reflect your selection.
Press Log / Linear to select the AM operating mode.
The AM status display will reflect your selection as
XX dB/V (Log) or XX %/V (Linear).
ERR
This error message is displayed
when the external AM modulating
signal exceeds the input voltage
range. The message “Reduce AM
Input Level” also appears at the bottom of the AM status display. AM is
turned off until the modulating signal is within the input voltage
range.
Press Edit Sens to open the AM Sensitivity parameter, then edit the current value using the cursor control key or rotary data knob or enter a new
value using the keypad and the appropriate terminator key (kHz/ms/STEPS for Linear; MHz/ms/dB for
Log). The AM Sensitivity range is 0 %/V to 100 %/V
in Linear and 0 dB/V to 25 dB/V in Log. To close the
open AM Sensitivity parameter, press Edit Sens or
make another menu selection.
Press 600W / 50W to select the input impedance of
the input connector. The AM status display will
reflect your selection.
Press Front / Rear to select the front panel or rear
panel AM IN connector. The AM status display will
reflect your selection.
Frequency
Modulation
Operating
Modes
The signal generator has two FM operation modes
—Locked FM and Unlocked FM. In Locked FM
mode, frequency modulation of the output signal is
accomplished by summing the modulating signal
into the FM control path of the YIG phase-lock loop.
Maximum FM deviation is the lesser of ±10 MHz or
Fmod x 300 for 1 kHz to 500 kHz rates.
In Unlocked FM mode, the YIG phase-lock loop is
disabled to allow for peak FM deviations of up to
100 MHz. There are two Unlocked FM modes—Unlocked Narrow and Unlocked Wide.
In Unlocked Narrow mode, frequency modulation is
obtained by applying the modulating signal to the
fine tuning coil of the YIG-tuned oscillator. Unlocked Narrow FM mode allows maximum deviations of ±10 MHz for DC to 500 kHz rates.
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SIGNAL
MODULATION
In Unlocked Wide mode, frequency modulation is
accomplished by applying the modulating signal to
the main tuning coil of the YIG-tuned oscillator. Unlocked Wide FM mode allows maximum deviations
of ±100 MHz for DC to 100 Hz rates.
Providing
Frequency
Modulation
To provide frequency modulation, first set up the external signal generator, then connect it to either the
681XXC front or rear panel FM IN connector.
Next, press MODULATION . At the resulting menu
display, press FM . The right-most External FM
Status Menu (below) is displayed. Pressing More
brings up the left-most menu.
Now, press the menu soft-key FM Modes . The third
External FM Status Menu (below) is displayed.
This menu lets you select the FM operating mode.
UNLOCKED
When Unlocked Narrow FM or Unlocked Wide FM is selected ON, this
warning message is displayed on all
menu displays to remind the operator that the carrier frequency is not
phase-locked.
Press Locked LN to select the Locked Low-Noise
FM operating mode; Press Locked to select the
Locked FM operating mode; press Unlocked Narrow
to select the Unlocked Narrow FM operating mode;
or press Unlocked Wide to select the Unlocked
Wide FM operating mode. The FM status display
will reflect your selection.
Press Previous Menu to return to the main External FM Status Menu display (next page).
681XXC OM
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LOCAL (FRONT
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SIGNAL
MODULATION
This menu contains an external FM status window
that shows the current menu selections and the
measured FM Deviation. (The FM deviation measurement function measures the voltage of the external modulation signal and calculates the peak
frequency deviation.) This menu lets you perform
the following:
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ERR
This error message is displayed
when the external FM modulating
signal exceeds the input voltage
range. The message “Reduce FM
Input Level” also appears at the bottom of the FM status display. FM is
turned off until the modulating signal is within the input voltage
range.
Turn FM on/off.
Set the FM sensitivity.
Select the input impedance (600W or 50W) of
the input connector.
Select the input connector (front panel or rear
panel FM IN) that is connected to the external
signal source.
Press On / Off to turn FM on and off. Both the FM
status display and FM modulation status area will
reflect your selection.
Press Edit Sens to open the FM Sensitivity parameter, then edit the current value using the cursor control key or rotary data knob or enter a new
value using the keypad and the appropriate terminator key. The FM Sensitivity range is ±10 kHz/V to
±20 MHz/V for Locked and Unlocked Narrow FM
modes and ±100 kHz/V to ±100 MHz/V for Unlocked
Wide FM mode. To close the open FM Sensitivity parameter, press Edit Sens or make another menu selection.
Press 600W/50W to select the input impedance of
the input connector. The FM status display will
reflect your selection.
Press Front/Rear to select the front or rear panel
FM IN connector. The FM status display will reflect
your selection.
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SIGNAL
MODULATION
Square Wave
Modulation
Operating
Modes
The 681XXC provides square wave (pulse) modulation of the output signal using modulating signals
from either its internal square wave generator or an
external signal generator.
The signal generator’s internal square wave generator outputs modulating signals of 400 Hz, 1 kHz,
7.8125 kHz, and 27.8 kHz. The modulating signals
are selectable from a menu.
The 681XXC accepts modulating signals from an external signal generator that are TTL-compatible
with the minimum pulse width of >5 ms.
Providing
Square Wave
Modulation
The following are the menu selections necessary to
provide square wave (pulse) modulation of the output signal using a modulating signal from both the
internal and external sources.
Press MODULATION . At the resulting menu display, press SqWave . The Square Wave Status
Menu (below) is displayed.
This menu contains the square wave status window
that shows the current menu selections. This menu
lets you perform the following:
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681XXC OM
Turn square wave modulation on/off.
Select Internal or External source for the
modulation signal.
Select the polarity of the signal (High or Low)
that turns the RF on.
Go to an additional menu (to select the frequency from the internal source or to select the
front or rear panel input connector).
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SIGNAL
MODULATION
Press On/Off to turn square wave modulation on
and off. Both the Square Wave status display and
the Square Wave modulation status area will reflect
your selection.
Press Internal/External to select the source of the
modulating signal. If you select Internal, the status
display shows Source as Internal and Frequency
lists the actual source frequency. If you select External, the display shows Frequency as Ext (external)
and Source as Front or Rear to indicate which input
connector is selected.
Press L RF On/H RF On to select the polarity of the
signal that triggers the RF on.
Press More to go to the additional menu.
Internal Source Frequency Selection
If you have selected Internal to use the modulating
signal from the internal source, then when you
press More the menu shown below is displayed.
Use the cursor control key to chose the desired
modulating signal frequency, then press Select to
enter the selection into memory. The Square Wave
status display will reflect your selection.
Press Previous Menu to return to the initial Square
Wave Status Menu display.
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SIGNAL
MODULATION
External Source Input Connector Selection
If you have selected External to use a modulating
signal from an external source, then when you press
More the menu (below) is displayed.
Press Front/Rear to select the front or rear panel
IN connector. The Square Wave status display
shows your selection as Source.
Press Previous Menu to return to the initial Square
Wave Status Menu display.
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LOCAL (FRONT
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3-13
SYSTEM
CONFIGURATION
SYSTEM
CONFIGURATION
The system configuration function provides menus that let you set or
select instrument configuration items; for example, display intensity,
polarity of blanking and video marker outputs, RF on or off during retrace or between steps, frequency scaling, GPIB operating parameters,
external interface language, and increment sizes for frequency, power
level, and time parameters. Use the System Configuration menu map
(Chapter 4, Figure 4-14) to follow the menu sequences.
To go to the System Configuration menu, first press SYSTEM . At the
System Menu display, press Config . The System Configuration Menu
(below) is displayed.
This menu lets you go to the Front Panel, Rear Panel, RF, GPIB, and
Increment Configuration menus.
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SYSTEM
CONFIGURATION
Configuring
the Front
Panel
Configuring the front panel of the signal generator
involves adjusting the intensity level of the data display for ease of viewing.
To go to the Configure Front Panel menu from the
System Configuration menu, press Front Panel .
The Configure Front Panel Menu (below) is displayed.
Press Brite (repeatedly) to increase the intensity of
the data display to the desired level.
Press Dim (repeatedly) to decrease the intensity of
the data display.
Press Previous Menu to return to the System Configuration Menu display.
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LOCAL (FRONT
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SYSTEM
CONFIGURATION
Configuring
the Rear
Panel
Configuring the rear panel of the signal generator
consists of selecting the polarity of the retrace
blanking, bandswitch blanking, retrace penlift, and
video marker outputs.
To go to the Configure Rear Panel menu from the
System Configuration menu, press Rear Panel . The
Configure Rear Panel Menu (below) is displayed.
Press Blanking +/– to select a +5V or –5V level for
the retrace and bandswitch blanking outputs. The
retrace blanking and bandswitch blanking signal
outputs are both available at the rear panel AUX
I/O connector. The display will reflect your selection.
Press Penlift to select normally-open (N/O) or normally-closed (N/C) contacts on the internal penlift
relay. The penlift relay output, optionally available
at the rear panel, is used to lift a plotter pen during
retrace.The display will reflect your selection.
Press Marker +/– to select a +5V or –5V level for
the video marker output when video markers are selected ON. The video marker signal output is available at the rear panel AUX I/O connector. The
display will reflect your selection.
Press Previous Menu to return to the System Configuration Menu display.
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SYSTEM
CONFIGURATION
Configuring
the RF
Configuring the RF of the 681XXC involves the following:
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Selecting whether the RF should be on or off
during retrace.
Selecting whether the RF should be on or off
during frequency switching in CW, step sweep,
and list sweep modes.
Selecting whether a sweep triggered be a single or external trigger should rest at the top or
bottom of the sweep ramp.
Selecting whether the RF should be on or off at
reset.
Setting the reference multiplier value for frequency scaling.
Selecting 40 dB or 0 dB of attenuation when
RF is switched off in units with a step attenuator (Option 2) installed.
To go to the Configure RF Menu (below) from the
System Configuration menu, press RF .
Press Retrace RF to select RF On or Off during
retrace. The display will reflect your selection.
Press Delta-F RF to select RF On or Off during frequency switching in CW, step sweep, and list sweep
modes. The display will reflect your selection.
Press Ramp Rest to select 0 or 10 for the ramp rest
point for sweeps triggered a single or external trigger. 0 indicates that the sweep will rest at the bottom of the sweep ramp; 10 indicates that the sweep
will rest at the top of the sweep ramp. The display
will reflect your selection.
Press More to go to the additional Configure RF
menu for more selections.
Press Previous Menu to return to the System Configuration Menu display.
681XXC OM
3-83
LOCAL (FRONT
PANEL) OPERATION
SYSTEM
CONFIGURATION
Additional Configure RF Menu
When you press More , the Additional Configure RF
Menu (below) is displayed.
Press Reset State to select RF On or Off at reset.
The display will reflect your selection.
Frequency Scaling – Lets you set a reference multiplier value and apply it to all frequency parameters. The reference multiplier can be any value
between 0.1 and 14. Changing the multiplier value
changes the entered and displayed frequencies, but
it does not affect the output of the signal generator.
NOTE
Resetting the 681XXC sets the frequency scaling reference multipler
to 1.
For example:
Frequency scaling set to 4
CW frequency set to 20 GHz
681XXC output frequency is 5 GHz (20 GHz ¸ 4)
Press Freq Scaling to open the reference multiplier
parameter, then edit the current value using the
cursor control key or rotary data knob or enter a
new value using the data entry key pad and any terminator key. To close the open multiplier parameter,
press Freq Scaling or make another menu selection.
NOTE
The Term RF Off selection is only
available in those 681XXC models
having Option 2 and Firmware Version 1.01 and above.
Press Term RF Off to select 40 dB (minimum) of attenuation when RF is switched off in units with a
step attenuator (Option 2) installed. This provides a
better output source match. The display will reflect
Yes to indicate the 40 dB of attenuation is applied.
Press Term RF Off again to select 0 dB of attenuation when the RF is switched off. The display will
reflect No to indicate 0 dB of attenuation is applied.
Press Previous Menu to return to the main Configure RF Menu display.
3-84
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SYSTEM
CONFIGURATION
Configuring
the GPIB
The GPIB configuration menus let you perform the
following:
q
q
q
q
q
Set the GPIB address and select the GPIB line
terminator for the signal generator.
Turn on the source lock mode for operation
with a Model 360B Vector Network Analyzer.
Select the model and set the GPIB address for
the power meter used to create a user level
flatness correction power-offset table.
Select the external interface language for remote operation of units with Option 19.
Select scalar mode of operation with a Hewlett
Packard Model 8757D Scalar Network Analyzer.
To go to the Configure GPIB menu from the System
Configuration menu, press GPIB . The Configure
GPIB Menu (below) is displayed.
Press GPIB Address to change the address of the
681XXC on the bus (the signal generator’s default
GPIB address is 5). Enter a new address, between 1
and 30, using the cursor control key or the data entry keypad and the terminator key
Hz
ns
ADRS
The new GPIB address will appear on the display.
Press Line Term to select a carriage return (CR) or
a carriage return and line feed (CR/LF) as the GPIB
data delimiter. Consult the GPIB controller’s manual to determine which data delimiter is required.
681XXC OM
3-85
LOCAL (FRONT
PANEL) OPERATION
SS MODE
When SS Mode is selected on, this
message is displayed (in the frequency mode title bar) on all menu
displays to remind the operator
that the 681XXC is in a source lock
mode.
SYSTEM
CONFIGURATION
Press SS Mode to place the signal generator in a
source lock mode for operation with a Anritsu Model
360B Vector Network Analyzer. (Refer to paragraph
7-4 for information pertaining to operating the
681XXC with a 360B VNA.) Press SS Mode again
to turn the source lock mode off.
Press More to go to the First Additional Configure
GPIB menu for more selections.
Press Previous Menu to return to the System Configuration Menu display.
First Additional Configure GPIB Menu
When you press More the First Additional Configure GPIB Menu (below) is displayed.
This menu lets you perform the following:
q
q
Select the model and set the GPIB address for
the power meter that is used to create a user
level flatness correction power-offset table.
(Refer to page 3-67 for a description of the
function.)
Select the external interface language for remote operation of 681XXCs with Option 19.
(Refer to page 2-9 for more information.)
Press Pwr Mtr Address to change the address of the
power meter on the GPIB (the power meter’s default
GPIB address is 13). Enter a new address, between
1 and 30, using the cursor control key or the data
entry keypad and the terminator key
Hz
ns
ADRS
The new GPIB address will appear on the display.
Press Pwr Mtr Select to select the power meter
model being used. (Supported power meters are the
Anritsus ML2437A, ML2438A, and ML4803A and
Hewlett-Packard 437B, 438A, and 70100A.)
3-86
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
SYSTEM
CONFIGURATION
Press Native SCPI to select the external interface
language to be used for remote operation of the
681XXC. (Language selection is only available on
instruments that have Option 19 installed.)
Press More to go to the Second Additional Configure GPIB menu.
Press Previous Menu to return to the main Configure GPIB Menu display.
Second Additional Configure GPIB Menu
When you press More , the Second Additional Configure GPIB Menu (below) is displayed.
This menu lets you select scalar mode of operation
with a Hewlett Packard Model 8757D Scalar Network Analyzer.
Press 8757D Scalar to enable operations with a
Hewlett Packard Model 8757D Scalar Network Analyzer. (Refer to paragraph 7-5 for procedures.) Press
8757D Scalar again to disable the operation.
Press Previous Menu to return to the First Additional Configure GPIB Menu display.
681XXC OM
3-87
LOCAL (FRONT
PANEL) OPERATION
SYSTEM
CONFIGURATION
Setting
Increment
Sizes
The Increment menu lets you set the incremental
size for editing frequency, power level, and time parameters. When the increment mode is selected on,
these parameter values will increase or decrease by
the set amount each time the Ù or Ú pad is pressed
or the rotary data knob is turned clockwise or counter-clockwise. The menu also lets you turn the increment mode on and off.
To go to the Increment menu from the System Configuration menu, press Incr Menu . The Increment
Menu (below) is displayed.
Press Freq Incr to open the frequency increment
parameter.
Press Level Incr to open the power level increment
parameter.
Press Time Incr to open the time increment
parameter.
Open the parameter you wish to change, then edit
the current value using the cursor control key or
rotary data knob or enter a new value using the key
pad and appropriate termination key. When you
have finished setting the open parameter, close it by
pressing its menu soft-key or by making another
menu selection.
Press Incr Mode to turn the increment mode on.
Press again to turn it off.
When done, press Previous Menu to return to the
System Configuration Menu display.
3-88
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
3-14
SAVING/RECALLING
INSTRUMENT SETUPS
SAVING/RECALLING
INSTRUMENT SETUPS
The 681XXC offers the capability to store up to ten complete front
panel setups. The setups are numbered 0 through 9. The following
paragraphs describe how to save and recall front panel setups.
Saving
Setups
Once you have decided that an instrument setup
should be retained for future use, follow the procedure below to save it.
First, press SYSTEM to display the System Menu.
Now, press Setups . The Setups Menu (below) is displayed.
Press Save , then enter the desired setup number
(between 0 and 9) on the keypad. The setup is now
saved.
NOTE
Setup #0 automatically saves the current
front panel settings when the instrument
is shutdown using the front panel LINE
key. Therefore, it is recommended that
you use only setups #1 through #9 to save
front panel setups.
When instrument shutdown occurs because of main power interruptions, the
current front panel settings are not
saved.
Recalling
Setups
To recall a previously saved setup, first access the
Setups Menu as described above.
At the Setups Menu, press Recall , then enter the
setup number on the keypad.
The instrument resets itself to the recalled configuration.
681XXC OM
3-89
LOCAL (FRONT
PANEL) OPERATION
SAVING/RECALLING
INSTRUMENT SETUPS
Erasing
Stored Setups
The front panel setups are stored in non-volatile
memory. A master reset is required to erase the contents of the setups and reprogram them with default
data.
To perform a master reset, proceed as follows:
NOTE
The master reset function overwrites all information stored in the
non-volatile memory with default
values. This includes the table of
2000 frequency/power level sets
used for the list sweep mode and
the five power-offset tables used for
the user level flatness correction
function.
Step 1
With the 681XXC in standby, press and
hold the RF OUTPUT ON/OFF key.
Step 2
Press the LINE OPERATE/STANDBY
key to turn the instrument on.
Step 3
When the first menu is displayed (after
the start-up display), release the RF
OUTPUT ON/OFF key.
The contents of non-volatile memory have now been
erased and reprogrammed with default data.
3-90
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
3-15
SECURE OPERATION
SECURE
OPERATION
The 681XXC can be operated in a secure mode of operation. In this
secure mode, the display of all frequency, power level, and modulation
parameters is disabled during both local (front panel) and remote
(GPIB) operations. The instrument will continue to function normally
in all other respects. The following paragraphs describe how to place
the signal generator in secure mode and how to return to normal operation.
To place the 681XXC in the secure mode, first press
SYSTEM to display the System Menu.
Next, press Secure . This places the signal generator in the secure mode and the Secure Menu (below)
is displayed.
NOTE
During secure mode, all main menu keys
and menu soft-keys operate normally. The
menu soft-key labels are displayed and
change with menu selections. Only the
parameter display is disabled.
To return the 681XXC to unsecured (normal) operation, press SYSTEM , then press Reset .
681XXC OM
3-91
LOCAL (FRONT
PANEL) OPERATION
3-16
REFERENCE
OSCILLATOR
CALIBRATION
REFERENCE
OSCILLATOR CALIBRATION
The reference oscillator calibration function lets you calibrate the
internal 100 MHz crystal reference oscillator of the 681XXC using an
external 10 MHz, 0 to +10 dBm reference signal.
NOTE
Before beginning calibration, always let
the 681XXC warm up for a minimum of
120 hours.
NOTE
This calibration is not applicable to
units having Option16, High Stability Time Base, installed.
To perform calibration of the internal reference oscillator, first connect the external 10 MHz reference
signal to the 681XXC rear panel 10 MHz REF IN connector.
Next, press the SYSTEM main menu key. At the
System Menu display, press Cal Menu to go to the
Calibration Menu (below).
Press Refrnce Cal to begin calibration.
Press Previous Menu to return to the System Menu
display.
When Refrnce Cal is pressed, the Calibration
Status Menu (below) is displayed.
Press Proceed to start the calibration.
Press Abort to cancel the calibration and return to
the Calibration Menu display.
3-92
681XXC OM
LOCAL (FRONT
PANEL) OPERATION
REFERENCE
OSCILLATOR CALIBRATION
When Proceed is pressed, the date parameter
opens for data entry.
Using the key pad, enter the current date (in any
desired format). Then, press any teminator key. The
Calibration Status Menu display changes to indicate
calibration is in progress.
When the reference calibration is complete, the Calibration Menu is displayed.
External Reference Not Connected
If calibration is attempted without an external
10 MHz reference signal connected to the rear panel
10 MHz REF IN connector, the Calibration Status
Menu displays the following.
681XXC OM
3-93/3-94
Chapter 4
Local Operation–Menu Maps
Table of Contents
4-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 4-3
4-2
MENU MAP DESCRIPTION . . . . . . . . . . . . . 4-3
Chapter 4
Local Operation–Menu Maps
4-1
4-2
INTRODUCTION
This chapter provides menu maps that support the 681XXC front
panel operating instructions found in Chapter 3. It includes menu
maps for all of the frequency, power level, and modulation modes of operation. In addition, a menu map for system configuration is also provided.
MENU MAP
DESCRIPTION
A menu map shows the menu key selections and instrument menu displays for a particular mode of signal generator operation. The menu
displays are shown as they appear on the instrument and are linked
together to show the sequence of menu selection. A brief description of
the function of each menu’s soft-keys is provided. If a menu soft-key
selects another menu, then it is shown linked to that menu. Figure
4-1, on page 4-5, is a sample menu map annotated to identify the key
elements.
The following is a list of the menu maps contained in this chapter.
Figure
681XXC OM
Title
Page
4-1
Sample Menu Map . . . . . . . . . . . . . . . . . . . . 4-5
4-2
CW Frequency Mode Menu Map . . . . . . . . . . . . . 4-6
4-3
Analog Sweep Frequency Mode Menu Map . . . . . . . 4-7
4-4
Step Sweep Frequency Mode Menu Map. . . . . . . . . 4-8
4-5
Manual Sweep Frequency Mode Menu Map . . . . . . . 4-9
4-6
List Sweep Frequency Mode Menu Map . . . . . . . . 4-10
4-7
Fixed Power Level Mode Menu Map . . . . . . . . . . 4-11
4-8
CW Power Sweep Mode Menu Map . . . . . . . . . . . 4-12
4-9
Sweep Frequency/Step Power Mode Menu Map . . . . 4-13
4-10
Leveling Modes Menu Map . . . . . . . . . . . . . . . 4-14
4-11
Amplitude Modulation Mode Menu Map . . . . . . . . 4-15
4-12
Frequency Modulation Mode Menu Map . . . . . . . . 4-16
4-13
Square Wave Modulation Mode Menu Map . . . . . . 4-17
4-14
System Configuration Menu Map . . . . . . . . . . . . 4-18
4-3/4-4
LOCAL OPERATION
–MENU MAPS
SAMPLE
MENU MAP
Figure 4-1. Sample Menu Map (Annotated)
681XXC OM
4-5
LOCAL OPERATION
–MENU MAPS
CW
FREQUENCY MODE
NOTES
Refer to Chapter 7, paragraph 7-2
for Master-Slave operating instructions.
Refer to Chapter 3, paragraph 3-7
for CW Frequency Mode operating
instructions.
Figure 4-2. CW Frequency Mode Menu Map
4-6
681XXC OM
LOCAL OPERATION
–MENU MAPS
ANALOG SWEEP
FREQUENCY MODE
NOTE
Refer to Chapter 3, paragraph 3-8
for Analog Sweep Frequency Mode
operating instructions.
Figure 4-3. Analog Sweep Frequency Mode
Menu Map
681XXC OM
4-7
LOCAL OPERATION
–MENU MAPS
STEP SWEEP
FREQUENCY MODE
NOTE
Refer to Chapter 3, paragraph 3-8
for Step Sweep Frequency Mode
operating instructions.
Figure 4-4. Step Sweep Frequency Mode
Menu Map
4-8
681XXC OM
LOCAL OPERATION
–MENU MAPS
MANUAL SWEEP
FREQUENCY MODE
NOTE
Refer to Chapter 3, paragraph 3-8
for Manual Sweep Frequency Mode
operating instructions.
Figure 4-5. Manual Sweep Frequency Mode
Menu Map
681XXC OM
4-9
LOCAL OPERATION
–MENU MAPS
LIST SWEEP
FREQUENCY MODE
NOTE
Refer to Chapter 3, paragraph 3-8
for List Sweep Frequency Mode
operating instructions.
Figure 4-6. List Sweep Frequency Mode
Menu Map
4-10
681XXC OM
LOCAL OPERATION
–MENU MAPS
FIXED POWER
LEVEL MODE
NOTE
Refer to Chapter 3, paragraph 3-9 for
Fixed Power Level Mode operating instructions.
Figure 4-7. Fixed Power Level Mode Menu
Map
681XXC OM
4-11
LOCAL OPERATION
–MENU MAPS
CW POWER
SWEEP MODE
NOTE
Refer to Chapter 3, paragraph 3-10
for CW Power Sweep Mode operating
instructions.
Figure 4-8. CW Power Sweep Mode Menu
Map
4-12
681XXC OM
LOCAL OPERATION
–MENU MAPS
SWEEP FREQUENCY/
STEP POWER MODE
NOTE
Refer to Chapter 3, paragraph 3-10 for
Sweep Frequency/Step Power Mode
operating instructions.
Figure 4-9. Sweep Frequency/Step Power
Mode Menu Map
681XXC OM
4-13
LOCAL OPERATION
–MENU MAPS
LEVELING
MODES
Selects Internal ALC
(Default Mode)
CW/SWEEP
SELECT
FREQUENCY
CONTROL
Selects Front Panel
External ALC Input
LEVEL/ALC
SELECT
LEVEL
CONTROL
Selects Rear Panel
External ALC Input
MODULATION
Selects External ALC
(External Detector Input)
Selects External ALC
Power Meter Input
Selects ALC Off
SYSTEM
Edit Current Power Level
Decouple The Attenuator
From The ALC Level
Press To Increase
Attenuation (10dB Steps)
Press To Decrease
Attenuation (10dB Steps)
CW/SWEEP
SELECT
Adjust the External ALC
FREQUENCY
CONTROL
ALC Slope On/Off
LEVEL/ALC
SELECT
Edit The ALC Slope
LEVEL
CONTROL
Edit The Pivot Point
MODULATION
SYSTEM
CW/SWEEP
SELECT
Edit Start Frequency
FREQUENCY
CONTROL
Edit End Frequency
LEVEL/ALC
SELECT
Edit Number Of Points
LEVEL
CONTROL
Selected Offset Table On/Off
MODULATION
Starts Calibration To Create
Offset Table
SYSTEM
NOTE
Refer to Chapter 3, paragraph 3-11 for
Leveling Modes operating instructions.
Figure 4-10. Leveling Modes Menu Map
4-14
681XXC OM
LOCAL OPERATION
–MENU MAPS
AMPLITUDE
MODULATION MODE
AM On✱/Off
Log AM (0-25dB/V) or
Linear AM (0-100%/V)
Edit AM Sensitivity
600 or 50
Input Impedance
Front Panel Input or
Rear Panel Input
CW/SWEEP
SELECT
FREQUENCY
CONTROL
LEVEL/ALC
SELECT
LEVEL
CONTROL
MODULATION
SYSTEM
CW/SWEEP
SELECT
FREQUENCY
CONTROL
LEVEL/ALC
SELECT
LEVEL
CONTROL
MODULATION
SYSTEM
✱
Display Showing AM Selected On
NOTE
Refer to Chapter 3, paragraph 3-12
for AM Mode operating instructions.
Figure 4-11. Amplitude Modulation Mode
Menu Map
681XXC OM
4-15
LOCAL OPERATION
–MENU MAPS
FREQUENCY
MODULATION MODE
FM On✱/Off
CW/SWEEP
SELECT
FREQUENCY
CONTROL
Edit FM Sensitivity
600 or 50
Input Impedance
Front Panel Input or
Rear Panel Input
LEVEL/ALC
SELECT
LEVEL
CONTROL
MODULATION
SYSTEM
Select Locked FM Mode
Selects Unlocked / Narrow
FM Mode
Selects Unlocked / Wide
FM Mode
CW/SWEEP
SELECT
FREQUENCY
CONTROL
LEVEL/ALC
SELECT
LEVEL
CONTROL
MODULATION
SYSTEM
✱
Display Showing FM Selected On
NOTE
Refer to Chapter 3, paragraph 3-12
for FM Mode operating instructions.
Figure 4-12. Frequency Modulation Mode
Menu Map
4-16
681XXC OM
LOCAL OPERATION
–MENU MAPS
SQUARE WAVE
MODULATION MODE
Internal Square Wave Source Selected
CW/SWEEP
SELECT
FREQUENCY
CONTROL
LEVEL/ALC
Internal Square Wave Source -orExternal Square Wave Source
SELECT
LEVEL
Square Wave
Modulation On/Off
LOW Level Triggers RF -orHIGH Level Triggers RF
CONTROL
Select Frequency
MODULATION
SYSTEM
External Square Wave Source Selected
CW/SWEEP
SELECT
FREQUENCY
CONTROL
LEVEL/ALC
SELECT
Internal Square Wave Source -orExternal Square Wave Source
Square Wave
Modulation On/Off
LOW Level Triggers RF -orHIGH Level Triggers RF
LEVEL
CONTROL
MODULATION
Front Panel Input
Rear Panel Input
SYSTEM
NOTE
Refer to Chapter 3, paragraph 3-12
for Square Wave Modulation Mode
operating instructions.
Figure 4-13. Square Wave Modulation Mode
Menu Map
681XXC OM
4-17
LOCAL OPERATION
–MENU MAPS
C W /S W E E P
S E L E C T
F R E Q U E N C Y
C O N T R O L
SYSTEM
CONFIGURATION
B r ig h te n s T h e D is p la y
D im s T h e D is p la y
L E V E L /A L C
S E L E C T
L E V E L
C O N T R O L
M O D U L A T IO N
S Y S T E M
S e
a n
S e
P e
S e
fo r
le c t + 5
d B a n d
le c t N o
n L ift R
le c t + 5
V id e o
V o r -5
s w itc h
r m a lly
e la y C
V o r -5
M a rk e
V L e
B la n
O p e
o n ta
V le v
rs
v e l F o r R e tra c e
k in g
n o r C lo s e d
c ts
e l
S e le c t R F O n o r O ff
D u r in g R e tr a c e
S e
S w
S e
o f
le c
itc
le c
S w
t R
h in
t R
e e
F O n o r O ff D u r in
g In C W , S te p , a n
e s t F o r S in g le S w
p R a m p , 1 0 F o r T
g F re
d L is
e e p ,
o p o f
S e le c t R F O n o r O ff a t R e s e t
q u e n c y
t M o d e s
0 F o r B o tto m
S w e e p R a m p
S e t R e fe r e n c e M u ltip lie r
S e le c t 4 0 d B o r 0 d B A tte n u a tio n
W h e n R F S w itc h e d O ff ( U n its
W ith O p tio n 2 O n ly )
S e
S e
S e
(O
S e le c t G P IB A d d r e s s
S e le c t C R o r C R /L F L in e T e r m in a to r
S S M o d e O n /O ff
t G P
le c t
le c t
p tio n
IB A
P o w
In te
1 9
d d re
e r M
rfa c e
O n ly
)
s s
e te r T y p e
L a n g u a g e
H P 8 7 5 7 D S c a la r M o d e O n /O ff
In c re m e n t M o d e O n /O ff
NOTE
Refer to Chapter 3, paragraph 3-13
for System Configuration operating
instructions.
S e t F re q u e n c y In c re m e n t
S e t P o w e r L e v e l In c re m e n t
S e t T im e In c r e m e n t
Figure 4-14. System Configuration Menu
Map
4-18
681XXC OM
Chapter 5
Operation Verification
Table of Contents
5-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 5-3
5-2
TEST EQUIPMENT. . . . . . . . . . . . . . . . . . 5-3
5-3
TEST RECORDS . . . . . . . . . . . . . . . . . . . 5-3
5-4
INITIAL 681XXC CHECKOUT. .
Power Up . . . . . . . . . . .
Self Test . . . . . . . . . . . .
Resetting the 681XXC . . . . .
Warmup Time . . . . . . . . .
5-5
CW FREQUENCY ACCURACY TEST . . . . . . . . 5-5
Test Setup . . . . . . . . . . . . . . . . . . . . 5-5
Test Procedure. . . . . . . . . . . . . . . . . . 5-6
5-6
POWER LEVEL ACCURACY AND FLATNESS
TESTS . . . . . . . . . . . . . . . . . . . . . . .
Test Setup . . . . . . . . . . . . . . . . . .
Power Level Accuracy Test Procedure . . . . .
Power Level Flatness Test Procedure . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. . . .
. . .
. . .
. . .
. . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
5-4
5-4
5-4
5-4
5-4
5-13
5-13
5-14
5-15
Chapter 5
Operation Verification
5-1
INTRODUCTION
This chapter contains three operation verification tests that can be
used to verify Series 681XXC Synthesized Signal Generator operation.
Setup instructions and performance procedures are included for each
test. The results can be compared with the specified limits that are
shown on the test record forms that are provided for each test.
5-2
TEST EQUIPMENT
Table 5-1 lists the recommended test equipment for performing the
operation verification tests in this chapter.
Table 5-1.
5-3
TEST RECORDS
681XXC OM
Recommended Test Equipment
Recommended
Manufacturer/Model
Instrument
Critical Specification
Frequency
Counter,
with
Cable Kit
and
External Mixer
Range: 0.01 to 65 GHz
Input Z: 50W
Resolution: 1 Hz
Other: External Time Base
Input
EIP Microwave, Inc. Models 538B,
548B, or 578B,
with
Cable Kit: Option 590
and
External Mixer:
Option 91 (26.5 to 40 GHz)
Option 92 (40 to 60 GHz)
Option 93 (60 to 90 GHz)
Power Meter,
with
Power
Sensors
Range: –30 to +20 dBm
(1mW to 100 mW)
Anritsu Model ML2437A or ML2438A,
with
Power Sensors:
MA2474A (0.01 to 40 GHz)
MA2475A (0.01 to 50 GHz)
Oscilloscope
Bandwidth: DC to 150 MHz
Vertical Sensitivity: 2 mV/
division
Horiz Sensitivity: 50 ns/
division
Tektronix, Inc. Model TAS485
Tables 5-2 and 5-3 contain test record forms that can be photocopied
and used to record the results of operational verification testing of
your 681XXC. These tables are included as part of the operational
verification test procedures and contain test information for all
681XXC models.
5-3
OPERATION
VERIFICATION
5-4
INITIAL 681XXC
CHECKOUT
INITIAL 681XXC
CHECKOUT
Before starting the operation verification tests in this chapter, perform
an initial checkout of the 681XXC to be tested. This initial checkout
consists of applying power to the signal generator, verifying that it
passes self-test, and resetting it to the factory default parameters.
Power Up
First, verify that the rear panel line voltage selector
is set for the correct line voltage, then connect the
681XXC to the power source. This automatically
places the signal generator in operation (front panel
OPERATE LED on).
During power up, the signal generator loads its operating program then returns to the exact setup it
was in when last turned off.
Self Test
Next, perform a self-test of the 681XXC to insure
proper operation of the instrument PCBs and other
internal assemblies.
To self-test the signal generator, press SYSTEM ,
then, press Selftest . When the self-test is complete,
the instrument displays the main CW menu.
NOTE
Error conditions detected during self-test
are displayed as error messages on the
data display. They should be corrected before continuing. Refer to Chapter 6 for a
listing of error messages and descriptions.
Resetting the
681XXC
The signal generator should be reset to the factoryselected default parameters before commencing operation verification testing.
To reset the 681XXC, first press SYSTEM , then
press Reset . The signal generator resets to the CW
frequency mode and displays the CW Menu.
Warmup Time
5-4
When the signal generator is turned on, allow one
hour of warmup time before performing operational
verification testing. This will assure stable operation of the instrument.
681XXC OM
OPERATION
VERIFICATION
5-5
CW FREQUENCY
ACCURACY TEST
CW FREQUENCY
ACCURACY TEST
The following test verifies that the CW frequency output of the signal
generator is within accuracy specifications. Table 5-2, beginning on
page 5-7, contains test records that you can copy and use to record test
results for this test. Test records for standard 681XXC models are contained in Table 5-2A ; test records for 681XXC models with Option 11
are contained in Table 5-2B.
6 8 1 X X C S IG N A L G E N E R A T O R
F R E Q U E N C Y C O U N T E R
1 0 M H z
R E F O U T
1 0 M H z
E X T IN
B a n d 3
In p u t
C o n n e c tio n B
B a n d 2
In p u t
R F O U T
(2 6 .5 to 6 5 G H z )
C o n n e c tio n A
Figure 5-1.
B a n d 4
In p u t
R F IN
M ix e r
(0 .0 1 to 2 6 .5 G H z )
Equipment Setup for CW Frequency Accuracy Test
Test Setup
Connect the equipment, shown in Figure 5-1, as follows:
Step 1
Connect the 681XXC rear panel 10 MHz
REF OUT to the Frequency Counter 10
MHz External Reference input. If the
Frequency Counter has an INT/EXT toggle switch, ensure the switch is set to
EXT.
Step 2
Connect the 681XXC RF OUTPUT to the
Frequency Counter RF Input as follows:
a. For measuring frequencies of 0.01 to
1.0 GHz, connect to the Band 2 input
(Connection A).
b. For measuring frequencies of 1.0 to
26.5 GHz, connect to the Band 3 input
(Connection A).
c. For measuring frequencies of 26.5 to
65.0 GHz, connect to the Band 4 input
as shown in Connection B using the
appropriate waveguide mixer; Option
91 (26.5 to 40 GHz), Option 92 (40 to
60 GHz), or Option 93 (60 to 90 GHz).
681XXC OM
5-5
OPERATION
VERIFICATION
CW FREQUENCY
ACCURACY TEST
Test
Procedure
The following procedure tests both the coarse and
fine loops to verify the accuracy of the CW frequency
output.
Step 1
Set up the 681XXC as follows:
a. Reset the instrument by pressing
SYSTEM , then RESET . Upon reset,
the CW Menu (below) is displayed.
b. Press Edit F1 to open the current frequency parameter for editing.
c. Set F1 to the first test frequency for
the model being tested (Table 5-2A is
the test record for standard models;
Table 5-2B for models with Option 11).
Step 2
Verify that the Frequency Counter reading meets specifications (±100 Hz of the
value shown on the test record for standard models; ±10 Hz for instruments with
Option 11).
Step 3
Record the Frequency Counter reading on
the test record (Table 5-2A or Table 5-2B).
NOTE
The Frequency Counter reading is
typically within ±1 Hz. Differences
of a few Hertz can be caused by
noise or counter limitations. Differences of ³±100 Hz (³±10 Hz for instruments with Option 11) indicate
a frequency synthesis problem.
5-6
Step 4
Set F1 to the next test frequency on the
test record and record the Frequency
Counter reading.
Step 5
Repeat step 4 until all frequencies listed
on the test record have been recorded.
681XXC OM
OPERATION
VERIFICATION
Table 5-2A.
CW FREQUENCY
ACCURACY TEST
CW Frequency Accuracy Test Record (for Standard Models) (1 of 3)
Model 681 _ _ C
Serial No. ____________________
68117C
Date ___________
68137C / 68147C
1.000 000 000*
_____________________
2.000 000 000*
_____________________
2.000 000 000
_____________________
5.000 000 000
_____________________
4.000 000 000
_____________________
8.000 000 000
_____________________
6.000 000 000
_____________________
11.000 000 000
_____________________
8.000 000 000
_____________________
14.000 000 000
_____________________
17.000 000 000
_____________________
20.000 000 000
_____________________
2.000 001 000
_____________________
2.000 001 000
_____________________
2.000 002 000
_____________________
2.000 002 000
_____________________
2.000 003 000
_____________________
2.000 003 000
_____________________
2.000 004 000
_____________________
2.000 004 000
_____________________
2.000 005 000
_____________________
2.000 005 000
_____________________
2.000 006 000
_____________________
2.000 006 000
_____________________
2.000 007 000
_____________________
2.000 007 000
_____________________
2.000 008 000
_____________________
2.000 008 000
_____________________
2.000 009 000
_____________________
2.000 009 000
_____________________
2.000 010 000
_____________________
2.000 010 000
_____________________
* Specification for all frequencies listed above is ±100 Hz. All frequencies are in GHz.
681XXC OM
5-7
OPERATION
VERIFICATION
Table 5-2A.
CW FREQUENCY
ACCURACY TEST
CW Frequency Accuracy Test Record (for Standard Models) (2 of 3)
Model 681 _ _ C
Serial No. ____________________
68167C
Date ___________
68177C
2.000 000 000*
_____________________
2.000 000 000*
_____________________
5.000 000 000
_____________________
6.000 000 000
_____________________
8.000 000 000
_____________________
10.000 000 000
_____________________
11.000 000 000
_____________________
14.000 000 000
_____________________
14.000 000 000
_____________________
18.000 000 000
_____________________
17.000 000 000
_____________________
22.000 000 000
_____________________
20.000 000 000
_____________________
26.000 000 000
_____________________
23.000 000 000
_____________________
30.000 000 000
_____________________
26.000 000 000
_____________________
34.000 000 000
_____________________
29.000 000 000
_____________________
38.000 000 000
_____________________
32.000 000 000
_____________________
42.000 000 000
_____________________
35.000 000 000
_____________________
46.000 000 000
_____________________
38.000 000 000
_____________________
50.000 000 000
_____________________
40.000 000 000
_____________________
2.000 001 000
_____________________
2.000 001 000
_____________________
2.000 002 000
_____________________
2.000 002 000
_____________________
2.000 003 000
_____________________
2.000 003 000
_____________________
2.000 004 000
_____________________
2.000 004 000
_____________________
2.000 005 000
_____________________
2.000 005 000
_____________________
2.000 006 000
_____________________
2.000 006 000
_____________________
2.000 007 000
_____________________
2.000 007 000
_____________________
2.000 008 000
_____________________
2.000 008 000
_____________________
2.000 009 000
_____________________
2.000 009 000
_____________________
2.000 010 000
_____________________
2.000 010 000
_____________________
* Specification for all frequencies listed above is ±100 Hz. All frequencies are in GHz.
5-8
681XXC OM
OPERATION
VERIFICATION
Table 5-2A.
CW FREQUENCY
ACCURACY TEST
CW Frequency Accuracy Test Record (for Standard Models) (3 of 3)
Model 681 _ _ C
Serial No. ____________________
68187C
Date ___________
68197C
2.000 000 000*
_____________________
2.000 000 000*
_____________________
6.000 000 000
_____________________
6.000 000 000
_____________________
10.000 000 000
_____________________
10.000 000 000
_____________________
14.000 000 000
_____________________
14.000 000 000
_____________________
18.000 000 000
_____________________
18.000 000 000
_____________________
22.000 000 000
_____________________
22.000 000 000
_____________________
26.000 000 000
_____________________
26.000 000 000
_____________________
30.000 000 000
_____________________
30.000 000 000
_____________________
34.000 000 000
_____________________
34.000 000 000
_____________________
38.000 000 000
_____________________
38.000 000 000
_____________________
42.000 000 000
_____________________
42.000 000 000
_____________________
46.000 000 000
_____________________
46.000 000 000
_____________________
50.000 000 000
_____________________
50.000 000 000
_____________________
54.000 000 000
_____________________
54.000 000 000
_____________________
58.000 000 000
_____________________
58.000 000 000
_____________________
60.000 000 000
_____________________
62.000 000 000
_____________________
65.000 000 000
_____________________
2.000 001 000
_____________________
2.000 001 000
_____________________
2.000 002 000
_____________________
2.000 002 000
_____________________
2.000 003 000
_____________________
2.000 003 000
_____________________
2.000 004 000
_____________________
2.000 004 000
_____________________
2.000 005 000
_____________________
2.000 005 000
_____________________
2.000 006 000
_____________________
2.000 006 000
_____________________
2.000 007 000
_____________________
2.000 007 000
_____________________
2.000 008 000
_____________________
2.000 008 000
_____________________
2.000 009 000
_____________________
2.000 009 000
_____________________
2.000 010 000
_____________________
2.000 010 000
_____________________
681XXC OM
5-9
OPERATION
VERIFICATION
Table 5-2B.
CW FREQUENCY
ACCURACY TEST
CW Frequency Accuracy Test Record (for Models with Option 11) (1 of 3)
Model 681 _ _ C
Serial No. ____________________
Date ___________
* Specification for all frequencies listed above is ±100 Hz. All frequencies are in GHz.
68117C
5-10
68137C / 68147C
1.000 000 000 0*
_____________________
2.000 000 000 0*
_____________________
2.000 000 000 0
_____________________
5.000 000 000 0
_____________________
4.000 000 000 0
_____________________
8.000 000 000 0
_____________________
6.000 000 000 0
_____________________
11.000 000 000 0
_____________________
8.000 000 000 0
_____________________
14.000 000 000 0
_____________________
17.000 000 000 0
_____________________
20.000 000 000 0
_____________________
2.000 000 100 0
_____________________
2.000 000 100 0
_____________________
2.000 000 200 0
_____________________
2.000 000 200 0
_____________________
2.000 000 300 0
_____________________
2.000 000 300 0
_____________________
2.000 000 400 0
_____________________
2.000 000 400 0
_____________________
2.000 000 500 0
_____________________
2.000 000 500 0
_____________________
2.000 000 600 0
_____________________
2.000 000 600 0
_____________________
2.000 000 700 0
_____________________
2.000 000 700 0
_____________________
2.000 000 800 0
_____________________
2.000 000 800 0
_____________________
2.000 000 900 0
_____________________
2.000 000 900 0
_____________________
2.000 001 000 0
_____________________
2.000 001 000 0
_____________________
681XXC OM
OPERATION
VERIFICATION
Figure 5-2B.
CW FREQUENCY
ACCURACY TEST
CW Frequency Accuracy Test Record (for Models with Option 11) (2 of 3)
Model 681 _ _ C
Serial No. ____________________
Date ___________
* Specification for all frequencies listed above is ±10 Hz. All frequencies are in GHz.
68167C
68177C
2.000 000 000 0*
_____________________
2.000 000 000 0*
_____________________
5.000 000 000 0
_____________________
6.000 000 000 0
_____________________
8.000 000 000 0
_____________________
10.000 000 000 0
_____________________
11.000 000 000 0
_____________________
14.000 000 000 0
_____________________
14.000 000 000 0
_____________________
18.000 000 000 0
_____________________
17.000 000 000 0
_____________________
22.000 000 000 0
_____________________
20.000 000 000 0
_____________________
26.000 000 000 0
_____________________
23.000 000 000 0
_____________________
30.000 000 000 0
_____________________
26.000 000 000 0
_____________________
34.000 000 000 0
_____________________
29.000 000 000 0
_____________________
38.000 000 000 0
_____________________
32.000 000 000 0
_____________________
42.000 000 000 0
_____________________
35.000 000 000 0
_____________________
46.000 000 000 0
_____________________
38.000 000 000 0
_____________________
50.000 000 000 0
_____________________
40.000 000 000 0
_____________________
2.000 000 100 0
_____________________
2.000 000 100 0
_____________________
2.000 000 200 0
_____________________
2.000 000 200 0
_____________________
2.000 000 300 0
_____________________
2.000 000 300 0
_____________________
2.000 000 400 0
_____________________
2.000 000 400 0
_____________________
2.000 000 500 0
_____________________
2.000 000 500 0
_____________________
2.000 000 600 0
_____________________
2.000 000 600 0
_____________________
2.000 000 700 0
_____________________
2.000 000 700 0
_____________________
2.000 000 800 0
_____________________
2.000 000 800 0
_____________________
2.000 000 900 0
_____________________
2.000 000 900 0
_____________________
2.000 001 000 0
_____________________
2.000 001 000 0
_____________________
681XXC OM
5-11
OPERATION
VERIFICATION
Table 5-2B.
CW FREQUENCY
ACCURACY TEST
CW Frequency Accuracy Test Record (for Models with Option 11) (3 of 3)
Model 681 _ _ C
Serial No. ____________________
Date ___________
* Specification for all frequencies listed above is ±10 Hz. All frequencies are in GHz.
68187C
5-12
68197C
2,000 000 000 0*
_____________________
2,000 000 000 0*
_____________________
6.000 000 000 0
_____________________
6.000 000 000 0
_____________________
10,000 000 000 0
_____________________
10,000 000 000 0
_____________________
14.000 000 000 0
_____________________
14.000 000 000 0
_____________________
18.000 000 000 0
_____________________
18.000 000 000 0
_____________________
22.000 000 000 0
_____________________
22.000 000 000 0
_____________________
26.000 000 000 0
_____________________
26.000 000 000 0
_____________________
30.000 000 000 0
_____________________
30.000 000 000 0
_____________________
34.000 000 000 0
_____________________
34.000 000 000 0
_____________________
38.000 000 000 0
_____________________
38.000 000 000 0
_____________________
42.000 000 000 0
_____________________
42.000 000 000 0
_____________________
46.000 000 000 0
_____________________
46.000 000 000 0
_____________________
50.000 000 000 0
_____________________
50.000 000 000 0
_____________________
54.000 000 000 0
_____________________
54.000 000 000 0
_____________________
58.000 000 000 0
_____________________
58.000 000 000 0
_____________________
60.000 000 000 0
_____________________
62.000 000 000 0
_____________________
65.000 000 000 0
_____________________
2.000 000 100 0
_____________________
2.000 000 100 0
_____________________
2.000 000 200 0
_____________________
2.000 000 200 0
_____________________
2.000 000 300 0
_____________________
2.000 000 300 0
_____________________
2.000 000 400 0
_____________________
2.000 000 400 0
_____________________
2.000 000 500 0
_____________________
2.000 000 500 0
_____________________
2.000 000 600 0
_____________________
2.000 000 600 0
_____________________
2.000 000 700 0
_____________________
2.000 000 700 0
_____________________
2.000 000 800 0
_____________________
2.000 000 800 0
_____________________
2.000 000 900 0
_____________________
2.000 000 900 0
_____________________
2.000 001 000 0
_____________________
2.000 001 000 0
_____________________
681XXC OM
OPERATION
VERIFICATION
5-6
POWER LEVEL
ACCURACY AND
FLATNESS TESTS
POWER LEVEL ACCURACY
AND FLATNESS TESTS
These tests verify that the power level accuracy and flatness of the
681XXC meet specifications. Table 5-3, beginning on page 5-19, contains test records that you can copy and use to record test results for
these tests. Test records are provided for each 681XXC model configuration.
6 8 1 X X C S IG N A L G E N E R A T O R
O S C IL L O S C O P E
H O R IZ
O U T
C H
R F
P o w e r
S e n s o r
Figure 5-2.
O U T
1 o r X In p u t
P O W E R M E T E R
Equipment Setup for Power Level Accuracy and Flatness Tests
Test Setup
Connect the equipment, shown in Figure 5-2, as
follows:
Step 1
Calibrate the Power Meter with the
Power Sensor.
NOTE
For £40 GHz models, use the
M A 2474A pow er s en s o r ; f o r
>40 GHz models, use the MA2475A
power sensor.
Step 2
Connect the Power Sensor to the RF OUTPUT of the 681XXC.
Step 3
Connect the 681XXC rear panel HORIZ
OUT to the Oscilloscope CH.1 input (X input).
NOTE
Before starting these procedures,
locate the test record in Table 5-3
for the particular 681XXC model
configuration being tested.
681XXC OM
5-13
OPERATION
VERIFICATION
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level
Accuracy Test
Procedure
Power level accuracy is checked by stepping the
power down in 1 dB increments from its maximum
rated power level.
Step 1
Set up the 681XXC as follows:
a. Reset the instrument by pressing
SYSTEM , then Reset . The CW
Menu (below) is displayed.
b. Press Edit F1 to open the current frequency parameter for editing.
c. Set F1 to the CW frequency noted on
the test record for the model being
tested.
d. Press Edit L1 to open the current
power level parameter for editing.
NOTE
In models with Option 22 that have
a high-end frequency of £20 GHz,
rated output power is reduced by
1 dB. In models with Option 22 that
have a high-end frequency of
>20 GHz, rated output power is reduced by 2 dB.
5-14
e. Set L1 to the power level noted on the
test record.
Step 2
Measure the output power level with the
Power Meter and record the reading on
the test record.
Step 3
Verify that the Power Meter reading
meets the specifications stated on the test
record.
Step 4
Set L1 to the next test power level. Record the Power Meter reading on the test
record.
Step 5
Repeat step 4 for the other levels listed on
the test record for the current CW frequency.
Step 6
Repeat steps 1 thru 5 for all CW frequencies listed on the test record.
681XXC OM
OPERATION
VERIFICATION
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level
Flatness Test
Procedure
Power level flatness is checked by measuring the
power level variation during a full band sweep; first
in the step sweep mode, then in the analog sweep
mode.
Step 1
Set up the 681XXC as follows for a step
sweep power level flatness test:
a. Reset the instrument by pressing
SYSTEM , then Reset . The CW
Menu is displayed.
b. Press Step to place the 681XXC in
the step sweep frequency mode and
display the Step Sweep Menu (below).
c. With the Step Sweep menu displayed,
press the main menu key
FREQUENCY
CONTROL
The Sweep Frequency Control Menu
(below) is displayed.
d. Press Full to select a full range frequency sweep.
e. Press Edit L1 to open the current
power level parameter for editing.
f. Set L1 to the power level noted on the
test record.
681XXC OM
5-15
OPERATION
VERIFICATION
POWER LEVEL ACCURACY
AND FLATNESS TESTS
g. Now, return to the Step Sweep menu
by pressing the main menu key
CW/SWEEP
SELECT
h. At the Step Sweep menu, press
Sweep Ramp to go to the Step Sweep
Ramp Menu (below).
i. Press Dwell Time to open the dwell
time-per-step parameter for editing.
j. Set the dwell time to 1 second.
NOTE
Monitor the 681XXC’s Horizontal
Output on the Oscilloscope to determine sweep start and stop.
Step 2
5-16
As the 681XXC steps through the full frequency range, measure the maximum and
minimum Power Meter readings and record the values on the test record. Verify
that the variation (difference between the
maximum and minimum readings) does
not exceed the value noted on the test record.
681XXC OM
OPERATION
VERIFICATION
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Step 3
Set up the 681XXC as follows for an analog sweep power level flatness test:
a. Reset the instrument by pressing
SYSTEM , then Reset . The CW
Menu is displayed.
b. Press Analog to place the 681XXC in
the analog sweep frequency mode and
display the Analog Sweep Menu.
c. With the Analog Sweep menu displayed, press the main menu key
FREQUENCY
CONTROL
The Sweep Frequency Control Menu
(below) is displayed.
d. Press Full to select a full range frequency sweep.
e. Press Edit L1 to open the current
power level parameter for editing.
f. Set L1 to the power level noted on the
test record.
g. Now, return to the Analog Sweep
menu by pressing the main menu key
CW/SWEEP
SELECT
681XXC OM
5-17
OPERATION
VERIFICATION
POWER LEVEL ACCURACY
AND FLATNESS TESTS
h. At the Analog Sweep menu, press the
menu soft-key Sweep Ramp to go to
the Analog Sweep Ramp Menu.
i. Press Sweep Time to open the sweep
time parameter for editing.
j. Set the sweep time to 99 seconds.
NOTE
Monitor the 681XXC’s Horizontal
Output on the Oscilloscope to determine sweep start and stop.
Step 4
5-18
During the analog sweep, measure the
maximum and minimum Power Meter
readings and record the values on the test
record. Verify that the variation (difference between the maximum and minimum readings) does not exceed the value
noted on the test record.
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (1 of 27)
Model 68117C
Serial No. ____________________
Date ___________
Model 68117C
(without Option 2 Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+13 dBm
_________dBm
+13 dBm
_________dBm
+12 dBm
_________dBm
+12 dBm
_________dBm
+11 dBm
_________dBm
+11 dBm
_________dBm
+10 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 1 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 8.4 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 2.0 dB (0.05 to 8.4 GHz)(typical, not a specification).
681XXC OM
5-19
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (2 of 27)
Model 68117C
Serial No. ____________________
Date ___________
Model 68117C
(with Option 2A Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+11 dBm
_________dBm
+11 dBm
_________dBm
+10 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 1 dBm
_________dBm
+ 0 dBm
_________dBm
+ 0 dBm
_________dBm
– 1 dBm
_________dBm
– 1 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 8.4 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 8.4 GHz)(typical, not a specification).
5-20
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (3 of 27)
Model 68117C
Serial No. ____________________
Date ___________
Model 68117C
(with Option 2E Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Set Power
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Measured Power
Set Power
Measured Power
+9 dBm
_________dBm
+9 dBm
_________dBm
+8 dBm
_________dBm
+8 dBm
_________dBm
+7 dBm
_________dBm
+7 dBm
_________dBm
+6 dBm
_________dBm
+6 dBm
_________dBm
+5 dBm
_________dBm
+5 dBm
_________dBm
+4 dBm
_________dBm
+4 dBm
_________dBm
+3 dBm
_________dBm
+3 dBm
_________dBm
+2 dBm
_________dBm
+2 dBm
_________dBm
+1 dBm
_________dBm
+1 dBm
_________dBm
0 dBm
_________dBm
0 dBm
_________dBm
–1 dBm
_________dBm
–1 dBm
_________dBm
–2 dBm
_________dBm
–2 dBm
_________dBm
–3 dBm
_________dBm
–3 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+9 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 8.4 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+9 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 8.4 GHz)(typical, not a specification).
681XXC OM
5-21
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (4 of 27)
Model 68117C w/Option 15A
Serial No. ____________________
Date ___________
Model 68117C with Option 15A High Power
(without Option 2 Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+13 dBm
_________dBm
+17 dBm
_________dBm
+12 dBm
_________dBm
+16 dBm
_________dBm
+11 dBm
_________dBm
+15 dBm
_________dBm
+10 dBm
_________dBm
+14 dBm
_________dBm
+ 9 dBm
_________dBm
+13 dBm
_________dBm
+ 8 dBm
_________dBm
+12 dBm
_________dBm
+ 7 dBm
_________dBm
+11 dBm
_________dBm
+ 6 dBm
_________dBm
+10 dBm
_________dBm
+ 5 dBm
_________dBm
+ 9 dBm
_________dBm
+ 4 dBm
_________dBm
+ 8 dBm
_________dBm
+ 3 dBm
_________dBm
+ 6 dBm
_________dBm
+ 2 dBm
_________dBm
+ 5 dBm
_________dBm
+ 1 dBm
_________dBm
+ 4 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 8.4 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 2.0 dB (0.05 to 8.4 GHz)(typical, not a specification).
5-22
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (5 of 27)
Model 68117C w/Option 15A
Serial No. ____________________
Date ___________
Model 68117C with Option 15A High Power
(with Option 2A Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+11 dBm
_________dBm
+15 dBm
_________dBm
+10 dBm
_________dBm
+14 dBm
_________dBm
+ 9 dBm
_________dBm
+13 dBm
_________dBm
+ 8 dBm
_________dBm
+12 dBm
_________dBm
+ 7 dBm
_________dBm
+11 dBm
_________dBm
+ 6 dBm
_________dBm
+10 dBm
_________dBm
+ 5 dBm
_________dBm
+ 9 dBm
_________dBm
+ 4 dBm
_________dBm
+ 8 dBm
_________dBm
+ 3 dBm
_________dBm
+ 7 dBm
_________dBm
+ 2 dBm
_________dBm
+ 6 dBm
_________dBm
+ 1 dBm
_________dBm
+ 5 dBm
_________dBm
+ 0 dBm
_________dBm
+ 4 dBm
_________dBm
– 1 dBm
_________dBm
+ 3 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 8.4 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 8.4 GHz)(typical, not a specification).
681XXC OM
5-23
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (6 of 27)
Model 68117C w/Option 15A
Serial No. ____________________
Date ___________
Model 68117C with Option 15A High Power
(with Option 2E Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+11 dBm
_________dBm
+11 dBm
_________dBm
+10 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 1 dBm
_________dBm
+ 0 dBm
_________dBm
+ 0 dBm
_________dBm
– 1 dBm
_________dBm
– 1 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 8.4 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 8.4 GHz)(typical, not a specification).
5-24
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (7 of 27)
Model 68137C
Serial No. ____________________
Date ___________
Model 68137C
(without Option 2 Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
+13 dBm
_________dBm
+12 dBm
_________dBm
+11 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 1.6 dB.
Power Level Flatness (Analog Sweep)
Set Power
+13 dBm
681XXC OM
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
5-25
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (8 of 27)
Model 68137C
Serial No. ____________________
Date ___________
Model 68137C
(with Option 2A Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
+11 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 0 dBm
_________dBm
– 1 dBm
_________dBm
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 1.6 dB.
Power Level Flatness (Analog Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 6.0 dB(typical, not a specification).
5-26
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (9 of 27)
Model 68137C
Serial No. ____________________
Date ___________
Model 68137C
(with Option 2F Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 0 dBm
_________dBm
– 1 dBm
_________dBm
– 2 dBm
_________dBm
– 3 dBm
_________dBm
– 4 dBm
_________dBm
– 5 dBm
_________dBm
– 6 dBm
_________dBm
– 7 dBm
_________dBm
– 8 dBm
_________dBm
– 9 dBm
_________dBm
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 3 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 1.6 dB.
Power Level Flatness (Analog Sweep)
Set Power
+ 3 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 6.0 dB (typical, not a specification).
681XXC OM
5-27
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (10 of 27)
Model 68137C w/Option 15A
Serial No. ____________________
Date ___________
Model 68137C with Option 15A High Power
(without Option 2 Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
+17 dBm
_________dBm
+16 dBm
_________dBm
+15 dBm
_________dBm
+14 dBm
_________dBm
+13 dBm
_________dBm
+12 dBm
_________dBm
+11 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 17 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 1.6 dB.
Power Level Flatness (Analog Sweep)
Set Power
+ 17 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 2.0 dB (typical, not a specification).
5-28
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (11 of 27)
Model 68137C w/Option 15A
Serial No. ____________________
Date ___________
Model 68137C with Option 15A High Power
(with Option 2A Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
+15 dBm
_________dBm
+14 dBm
_________dBm
+13 dBm
_________dBm
+12 dBm
_________dBm
+11 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 15 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 1.6 dB.
Power Level Flatness (Analog Sweep)
Set Power
+ 15 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 6.0 dB (typical, not a specification).
681XXC OM
5-29
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (12 of 27)
Model 68137C w/Option 15A
Serial No. ____________________
Date ___________
Model 68137C with Option 15A High Power
(with Option 2F Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 0 dBm
_________dBm
– 1 dBm
_________dBm
– 2 dBm
_________dBm
– 3 dBm
_________dBm
– 4 dBm
_________dBm
– 5 dBm
_________dBm
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 7 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 1.6 dB.
Power Level Flatness (Analog Sweep)
Set Power
+ 7 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 6.0 dB (typical, not a specification).
5-30
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (13 of 27)
Model 68147C
Serial No. ____________________
Date ___________
Model 68147C
(without Option 2 Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+13 dBm
_________dBm
+13 dBm
_________dBm
+12 dBm
_________dBm
+12 dBm
_________dBm
+11 dBm
_________dBm
+11 dBm
_________dBm
+10 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 1 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 20 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 2.0 dB (0.05 to 20 GHz) (typical, not a specification).
681XXC OM
5-31
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (14 of 27)
Model 68147C
Serial No. ____________________
Date ___________
Model 68147C
(with Option 2A Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+11 dBm
_________dBm
+11 dBm
_________dBm
+10 dBm
_________dBm
+10 dBm
_________dBm
+ 9 dBm
_________dBm
+ 9 dBm
_________dBm
+ 8 dBm
_________dBm
+ 8 dBm
_________dBm
+ 7 dBm
_________dBm
+ 7 dBm
_________dBm
+ 6 dBm
_________dBm
+ 6 dBm
_________dBm
+ 5 dBm
_________dBm
+ 5 dBm
_________dBm
+ 4 dBm
_________dBm
+ 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 1 dBm
_________dBm
+ 0 dBm
_________dBm
+ 0 dBm
_________dBm
– 1 dBm
_________dBm
– 1 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 20 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 20 GHz) (typical, not a specification).
5-32
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (15 of 27)
Model 68147C
Serial No. ____________________
Date ___________
Model 68147C
(with Option 2F Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+ 3 dBm
_________dBm
+ 3 dBm
_________dBm
+ 2 dBm
_________dBm
+ 2 dBm
_________dBm
+ 1 dBm
_________dBm
+ 1 dBm
_________dBm
+ 0 dBm
_________dBm
+ 0 dBm
_________dBm
– 1 dBm
_________dBm
– 1 dBm
_________dBm
– 2 dBm
_________dBm
– 2 dBm
_________dBm
– 3 dBm
_________dBm
– 3 dBm
_________dBm
– 4 dBm
_________dBm
– 4 dBm
_________dBm
– 5 dBm
_________dBm
– 5 dBm
_________dBm
– 6 dBm
_________dBm
– 6 dBm
_________dBm
– 7 dBm
_________dBm
– 7 dBm
_________dBm
– 8 dBm
_________dBm
– 8 dBm
_________dBm
– 9 dBm
_________dBm
– 9 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 3 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 20 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 3 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 20 GHz) (typical, not a specification).
681XXC OM
5-33
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (16 of 27)
Model 68147C w/Option 15A
Serial No. ____________________
Date ___________
Model 68147C with Option 15A High Power
(without Option 2 Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+ 13 dBm
_________dBm
+17 dBm
_________dBm
+ 12 dBm
_________dBm
+16 dBm
_________dBm
+ 11 dBm
_________dBm
+15 dBm
_________dBm
+ 10 dBm
_________dBm
+14 dBm
_________dBm
+ 9 dBm
_________dBm
+13 dBm
_________dBm
+ 8 dBm
_________dBm
+12 dBm
_________dBm
+ 7 dBm
_________dBm
+11 dBm
_________dBm
+ 6 dBm
_________dBm
+10 dBm
_________dBm
+ 5 dBm
_________dBm
+ 9 dBm
_________dBm
+ 4 dBm
_________dBm
+ 8 dBm
_________dBm
+ 3 dBm
_________dBm
+ 7 dBm
_________dBm
+ 2 dBm
_________dBm
+ 6 dBm
_________dBm
+ 1 dBm
_________dBm
+ 5 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness
Set Power
+ 13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 20 GHz).
Power Level Flatness (Analog Sweep)(Model 68347C only)
Set Power
+ 13 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 2.0 dB (0.05 to 20 GHz) (typical, not a specification).
5-34
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (17 of 27)
Model 68147C w/Option 15A
Serial No. ____________________
Date ___________
Model 68147C with Option 15A High Power
(with Option 2A Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+11 dBm
_________dBm
+15 dBm
_________dBm
+10 dBm
_________dBm
+14 dBm
_________dBm
+ 9 dBm
_________dBm
+13 dBm
_________dBm
+ 8 dBm
_________dBm
+12 dBm
_________dBm
+ 7 dBm
_________dBm
+11 dBm
_________dBm
+ 6 dBm
_________dBm
+10 dBm
_________dBm
+ 5 dBm
_________dBm
+ 9 dBm
_________dBm
+ 4 dBm
_________dBm
+ 8 dBm
_________dBm
+ 3 dBm
_________dBm
+ 7 dBm
_________dBm
+ 2 dBm
_________dBm
+ 6 dBm
_________dBm
+ 1 dBm
_________dBm
+ 5 dBm
_________dBm
+ 0 dBm
_________dBm
+ 4 dBm
_________dBm
– 1 dBm
_________dBm
+ 3 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 20 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+11 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 20 GHz) (typical, not a specification).
681XXC OM
5-35
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (18 of 27)
Model 68147C w/Option 15A
Serial No. ____________________
Date ___________
Model 68147C with Option 15A High Power
(with Option 2F Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
+11 dBm
_________dBm
+ 7 dBm
_________dBm
+10 dBm
_________dBm
+ 6 dBm
_________dBm
+ 9 dBm
_________dBm
+ 5 dBm
_________dBm
+ 8 dBm
_________dBm
+ 4 dBm
_________dBm
+ 7 dBm
_________dBm
+ 3 dBm
_________dBm
+ 6 dBm
_________dBm
+ 2 dBm
_________dBm
+ 5 dBm
_________dBm
+ 1 dBm
_________dBm
+ 4 dBm
_________dBm
+ 0 dBm
_________dBm
+ 3 dBm
_________dBm
– 1 dBm
_________dBm
+ 2 dBm
_________dBm
– 2 dBm
_________dBm
+ 1 dBm
_________dBm
– 3 dBm
_________dBm
+ 0 dBm
_________dBm
– 4 dBm
_________dBm
– 1 dBm
_________dBm
– 5 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 7 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 20 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 7 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 20 GHz) (typical, not a specification).
5-36
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (19 of 27)
Model 68167C
Serial No. ____________________
Date ___________
Model 68167C
(without Option 2B Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+13 dBm
_________dBm
+ 9 dBm
_________dBm
+ 6 dBm
_________dBm
+12 dBm
_________dBm
+ 8 dBm
_________dBm
+ 5 dBm
_________dBm
+11 dBm
_________dBm
+ 7 dBm
_________dBm
+ 4 dBm
_________dBm
+10 dBm
_________dBm
+ 6 dBm
_________dBm
+ 3 dBm
_________dBm
+ 9 dBm
_________dBm
+ 5 dBm
_________dBm
+ 2 dBm
_________dBm
+ 8 dBm
_________dBm
+ 4 dBm
_________dBm
+ 1 dBm
_________dBm
+ 7 dBm
_________dBm
+ 3 dBm
_________dBm
+ 0 dBm
_________dBm
+ 6 dBm
_________dBm
+ 2 dBm
_________dBm
– 1 dBm
_________dBm
+ 5 dBm
_________dBm
+ 1 dBm
_________dBm
– 2 dBm
_________dBm
+ 4 dBm
_________dBm
+ 0 dBm
_________dBm
– 3 dBm
_________dBm
+ 3 dBm
_________dBm
– 1 dBm
_________dBm
– 4 dBm
_________dBm
+ 2 dBm
_________dBm
– 2 dBm
_________dBm
– 5 dBm
_________dBm
+ 1 dBm
_________dBm
– 3 dBm
_________dBm
– 6 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 6 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 40 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 6 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz) 2.0 dB (0.01 to 20 GHz); 4.0 dB (20 to 40 GHz)(typical, not a
specification).
681XXC OM
5-37
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (20 of 27)
Model 68167C
Serial No. ____________________
Date ___________
Model 68167C
(with Option 2B Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+11 dBm
_________dBm
+ 7 dBm
_________dBm
+ 3 dBm
_________dBm
+10 dBm
_________dBm
+ 6 dBm
_________dBm
+ 2 dBm
_________dBm
+ 9 dBm
_________dBm
+ 5 dBm
_________dBm
+ 1 dBm
_________dBm
+ 8 dBm
_________dBm
+ 4 dBm
_________dBm
+ 0 dBm
_________dBm
+ 7 dBm
_________dBm
+ 3 dBm
_________dBm
– 1 dBm
_________dBm
+ 6 dBm
_________dBm
+ 2 dBm
_________dBm
– 2 dBm
_________dBm
+ 5 dBm
_________dBm
+ 1 dBm
_________dBm
– 3 dBm
_________dBm
+ 4 dBm
_________dBm
+ 0 dBm
_________dBm
– 4 dBm
_________dBm
+ 3 dBm
_________dBm
– 1 dBm
_________dBm
– 5 dBm
_________dBm
+ 2 dBm
_________dBm
– 2 dBm
_________dBm
– 6 dBm
_________dBm
+ 1 dBm
_________dBm
– 3 dBm
_________dBm
– 7 dBm
_________dBm
+ 0 dBm
_________dBm
– 4 dBm
_________dBm
– 8 dBm
_________dBm
– 1 dBm
_________dBm
– 5 dBm
_________dBm
– 9 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 3 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 40 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 3 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 20 GHz); 8.2 dB (20 to 40 GHz) (typical, not a
specification).
5-38
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (21 of 27)
Model 68167C w/Option 15A
Serial No. ____________________
Date ___________
Model 68167C with Option 15A High Power
(without Option 2B Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+13 dBm
_________dBm
+13 dBm
_________dBm
+ 6 dBm
_________dBm
+12 dBm
_________dBm
+12 dBm
_________dBm
+ 5 dBm
_________dBm
+11 dBm
_________dBm
+11 dBm
_________dBm
+ 4 dBm
_________dBm
+10 dBm
_________dBm
+10 dBm
_________dBm
+ 3 dBm
_________dBm
+ 9 dBm
_________dBm
+ 9 dBm
_________dBm
+ 2 dBm
_________dBm
+ 8 dBm
_________dBm
+ 8 dBm
_________dBm
+ 1 dBm
_________dBm
+ 7 dBm
_________dBm
+ 7 dBm
_________dBm
+ 0 dBm
_________dBm
+ 6 dBm
_________dBm
+ 6 dBm
_________dBm
– 1 dBm
_________dBm
+ 5 dBm
_________dBm
+ 5 dBm
_________dBm
– 2 dBm
_________dBm
+ 4 dBm
_________dBm
+ 4 dBm
_________dBm
– 3 dBm
_________dBm
+ 3 dBm
_________dBm
+ 3 dBm
_________dBm
– 4 dBm
_________dBm
+ 2 dBm
_________dBm
+ 2 dBm
_________dBm
– 5 dBm
_________dBm
+ 1 dBm
_________dBm
+ 1 dBm
_________dBm
– 6 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 6 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 40 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 6 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 2.0 dB (0.05 to 20 GHz); 4.0 dB (20 to 40 GHz) (typical, not a
specification).
681XXC OM
5-39
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (22 of 27)
Model 68167C w/Option 15A
Serial No. ____________________
Date ___________
Model 68167C with Option 15A High Power
(with Option 2B Step Attenuator)
Power Level Accuracy *
(CW Frequency = 1.0 GHz)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+11 dBm
_________dBm
+11 dBm
_________dBm
+ 3 dBm
_________dBm
+10 dBm
_________dBm
+10 dBm
_________dBm
+ 2 dBm
_________dBm
+ 9 dBm
_________dBm
+ 9 dBm
_________dBm
+ 1 dBm
_________dBm
+ 8 dBm
_________dBm
+ 8 dBm
_________dBm
+ 0 dBm
_________dBm
+ 7 dBm
_________dBm
+ 7 dBm
_________dBm
– 1 dBm
_________dBm
+ 6 dBm
_________dBm
+ 6 dBm
_________dBm
– 2 dBm
_________dBm
+ 5 dBm
_________dBm
+ 5 dBm
_________dBm
– 3 dBm
_________dBm
+ 4 dBm
_________dBm
+ 4 dBm
_________dBm
– 4 dBm
_________dBm
+ 3 dBm
_________dBm
+ 3 dBm
_________dBm
– 5 dBm
_________dBm
+ 2 dBm
_________dBm
+ 2 dBm
_________dBm
– 6 dBm
_________dBm
+ 1 dBm
_________dBm
+ 1 dBm
_________dBm
– 7 dBm
_________dBm
+ 0 dBm
_________dBm
+ 0 dBm
_________dBm
– 8 dBm
_________dBm
– 1 dBm
_________dBm
– 1 dBm
_________dBm
– 9 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 3 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 40 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 3 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.01 to 20 GHz); 8.2 dB (20 to 40 GHz)(typical, not a
specification).
5-40
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (23 of 27)
Model 68177C
Serial No. ____________________
Date ___________
Model 68177C
(without Option 2C Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Power Level Accuracy *
(CW Frequency = 45.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+10 dBm
_________dBm
+ 2.5 dBm
_________dBm
+ 2.5 dBm
_________dBm
+ 9 dBm
_________dBm
+ 1.5 dBm
_________dBm
+ 1.5 dBm
_________dBm
+ 8 dBm
_________dBm
+ 0.5 dBm
_________dBm
+ 0.5 dBm
_________dBm
+ 7 dBm
_________dBm
– 0.5 dBm
_________dBm
– 0.5 dBm
_________dBm
+ 6 dBm
_________dBm
– 1.5 dBm
_________dBm
– 1.5 dBm
_________dBm
+ 5 dBm
_________dBm
– 2.5 dBm
_________dBm
– 2.5 dBm
_________dBm
+ 4 dBm
_________dBm
– 3.5 dBm
_________dBm
– 3.5 dBm
_________dBm
+ 3 dBm
_________dBm
– 4.5 dBm
_________dBm
– 4.5 dBm
_________dBm
+ 2 dBm
_________dBm
– 5.5 dBm
_________dBm
– 5.5 dBm
_________dBm
+ 1 dBm
_________dBm
– 6.5 dBm
_________dBm
– 6.5 dBm
_________dBm
+ 0 dBm
_________dBm
– 7.5 dBm
_________dBm
– 7.5 dBm
_________dBm
– 1 dBm
_________dBm
– 8.5 dBm
_________dBm
– 8.5 dBm
_________dBm
– 2 dBm
_________dBm
– 9.5 dBm
_________dBm
– 9.5 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.5 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 2.5 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 40 GHz); 2.2 dB (40 to 50 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 2.5 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 2.0 dB (0.05 to 20 GHz); 4.0 dB (20 to 40 GHz); 5.0 dB (40 to
50 GHz) (typical, not a specification).
681XXC OM
5-41
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (24 of 27)
Model 68177C
Serial No. ____________________
Date ___________
Model 68177C
(with Option 2C Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Power Level Accuracy *
(CW Frequency = 45.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+ 8.5 dBm
_________dBm
+ 0 dBm
_________dBm
– 1 dBm
_________dBm
+ 7.5 dBm
_________dBm
– 1 dBm
_________dBm
– 2 dBm
_________dBm
+ 6.5 dBm
_________dBm
– 2 dBm
_________dBm
– 3 dBm
_________dBm
+ 5.5 dBm
_________dBm
– 3 dBm
_________dBm
– 4 dBm
_________dBm
+ 4.5 dBm
_________dBm
– 4 dBm
_________dBm
– 5 dBm
_________dBm
+ 3.5 dBm
_________dBm
– 5 dBm
_________dBm
– 6 dBm
_________dBm
+ 2.5 dBm
_________dBm
– 6 dBm
_________dBm
– 7 dBm
_________dBm
+ 1.5 dBm
_________dBm
– 7 dBm
_________dBm
– 8 dBm
_________dBm
+ 0.5 dBm
_________dBm
– 8 dBm
_________dBm
– 9 dBm
_________dBm
– 0.5 dBm
_________dBm
– 9 dBm
_________dBm
–10 dBm
_________dBm
– 1.5 dBm
_________dBm
–10 dBm
_________dBm
–11 dBm
_________dBm
– 2.5 dBm
_________dBm
–11 dBm
_________dBm
–12 dBm
_________dBm
– 3.5 dBm
_________dBm
–12 dBm
_________dBm
–13 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.5 dB.
Power Level Flatness (Step Sweep)
Set Power
– 1 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 40 GHz); 2.2 dB (40 to 50 GHz).
Power Level Flatness (Analog Sweep)
Set Power
– 1 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 20 GHz); 8.2 dB (20 to 40 GHz); 10.2 dB (40 to
50 GHz) (typical, not a specification).
5-42
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (25 of 27)
Model 68187C
Serial No. ____________________
Date ___________
Model 68187C
(without Option 2D Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Power Level Accuracy *
(CW Frequency = 50.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+10 dBm
_________dBm
+ 2.5 dBm
_________dBm
+ 2 dBm
_________dBm
+ 9 dBm
_________dBm
+ 1.5 dBm
_________dBm
+ 1 dBm
_________dBm
+ 8 dBm
_________dBm
+ 0.5 dBm
_________dBm
+ 0 dBm
_________dBm
+ 7 dBm
_________dBm
– 0.5 dBm
_________dBm
– 1 dBm
_________dBm
+ 6 dBm
_________dBm
– 1.5 dBm
_________dBm
– 2 dBm
_________dBm
+ 5 dBm
_________dBm
– 2.5 dBm
_________dBm
– 3 dBm
_________dBm
+ 4 dBm
_________dBm
– 3.5 dBm
_________dBm
– 4 dBm
_________dBm
+ 3 dBm
_________dBm
– 4.5 dBm
_________dBm
– 5 dBm
_________dBm
+ 2 dBm
_________dBm
– 5.5 dBm
_________dBm
– 6 dBm
_________dBm
+ 1 dBm
_________dBm
– 6.5 dBm
_________dBm
– 7 dBm
_________dBm
+ 0 dBm
_________dBm
– 7.5 dBm
_________dBm
– 8 dBm
_________dBm
– 1 dBm
_________dBm
– 8.5 dBm
_________dBm
– 9 dBm
_________dBm
– 2 dBm
_________dBm
– 9.5 dBm
_________dBm
–10 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.5 dB.
Power Level Flatness (Step Sweep)
Set Power
+ 2 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.05 to 40 GHz); 2.2 dB (40 to 60 GHz).
Power Level Flatness (Analog Sweep)
Set Power
+ 2 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 2.0 dB (0.05 to 20 GHz); 4.0 dB (20 to 40 GHz); 5.0 dB (40 to
60 GHz) (typical, not a specification).
681XXC OM
5-43
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (26 of 27)
Model 68187C
Serial No. ____________________
Date ___________
Model 68187C
(with Option 2D Step Attenuator)
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Power Level Accuracy *
(CW Frequency = 50.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+ 8.5 dBm
_________dBm
+ 0 dBm
_________dBm
– 1.5 dBm
_________dBm
+ 7.5 dBm
_________dBm
– 1 dBm
_________dBm
– 2.5 dBm
_________dBm
+ 6.5 dBm
_________dBm
– 2 dBm
_________dBm
– 3.5 dBm
_________dBm
+ 5.5 dBm
_________dBm
– 3 dBm
_________dBm
– 4.5 dBm
_________dBm
+ 4.5 dBm
_________dBm
– 4 dBm
_________dBm
– 5.5 dBm
_________dBm
+ 3.5 dBm
_________dBm
– 5 dBm
_________dBm
– 6.5 dBm
_________dBm
+ 2.5 dBm
_________dBm
– 6 dBm
_________dBm
– 7.5 dBm
_________dBm
+ 1.5 dBm
_________dBm
– 7 dBm
_________dBm
– 8.5 dBm
_________dBm
+ 0.5 dBm
_________dBm
– 8 dBm
_________dBm
– 9.5 dBm
_________dBm
– 0.5 dBm
_________dBm
– 9 dBm
_________dBm
–10.5 dBm
_________dBm
– 1.5 dBm
_________dBm
–10 dBm
_________dBm
–11.5 dBm
_________dBm
– 2.5 dBm
_________dBm
–11 dBm
_________dBm
–12.5 dBm
_________dBm
– 3.5 dBm
_________dBm
–12 dBm
_________dBm
–13.5 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.5 dB.
Power Level Flatness (Step Sweep)
Set Power
– 2 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.01 to 40 GHz); 2.2 dB (40 to 60 GHz).
Power Level Flatness (Analog Sweep)
Set Power
– 2 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 7.0 dB (0.01 to 0.05 GHz); 6.0 dB (0.05 to 20 GHz); 8.2 dB (20 to 40 GHz); 10.2 dB (40 to
60 GHz) (typical, not a specification.
5-44
681XXC OM
OPERATION
VERIFICATION
Table 5-3.
POWER LEVEL ACCURACY
AND FLATNESS TESTS
Power Level Accuracy and Flatness Test Record (27 of 27)
Model 68197C
Serial No. ____________________
Date ___________
Model 68197C
Power Level Accuracy *
(CW Frequency = 5.0 GHz)
Power Level Accuracy *
(CW Frequency = 25.0 GHz)
Power Level Accuracy *
(CW Frequency = 50.0 GHz)
Set Power
Measured Power
Set Power
Measured Power
Set Power
Measured Power
+10 dBm
_________dBm
+ 2.5 dBm
_________dBm
+ 0 dBm
_________dBm
+ 9 dBm
_________dBm
+ 1.5 dBm
_________dBm
– 1 dBm
_________dBm
+ 8 dBm
_________dBm
+ 0.5 dBm
_________dBm
– 2 dBm
_________dBm
+ 7 dBm
_________dBm
– 0.5 dBm
_________dBm
– 3 dBm
_________dBm
+ 6 dBm
_________dBm
– 1.5 dBm
_________dBm
– 4 dBm
_________dBm
+ 5 dBm
_________dBm
– 2.5 dBm
_________dBm
– 5 dBm
_________dBm
+ 4 dBm
_________dBm
– 3.5 dBm
_________dBm
– 6 dBm
_________dBm
+ 3 dBm
_________dBm
– 4.5 dBm
_________dBm
– 7 dBm
_________dBm
+ 2 dBm
_________dBm
– 5.5 dBm
_________dBm
– 8 dBm
_________dBm
+ 1 dBm
_________dBm
– 6.5 dBm
_________dBm
– 9 dBm
_________dBm
+ 0 dBm
_________dBm
– 7.5 dBm
_________dBm
–10 dBm
_________dBm
– 1 dBm
_________dBm
– 8.5 dBm
_________dBm
–11 dBm
_________dBm
– 2 dBm
_________dBm
– 9.5 dBm
_________dBm
–12 dBm
_________dBm
* Specification is ±1.0 dB.
* Specification is ±1.0 dB.
* Specification is ±1.5 dB.
Power Level Flatness (Step Sweep)
Set Power
– 2 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation **
_________dB
** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 1.6 dB (0.01 to 40 GHz); 2.2 dB (40 to 65 GHz).
Power Level Flatness (Analog Sweep)
Set Power
– 2 dBm
Max Power
_________dBm
Min Power
__________dBm
Variation ***
_________dB
*** Maximum variation is 4.0 dB (0.01 to 0.05 GHz); 2.0 dB (0.05 to 20 GHz); 4.0 dB (20 to 40 GHz); 5.0 dB (40 to
65 GHz) (typical, not a specification.
681XXC OM
5-45/5-46
Chapter 6
Operator Maintenance
Table of Contents
6-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 6-3
6-2
ERROR AND WARNING/STATUS MESSAGES. . . 6-3
Self-Test Error Messages. . . . . . . . . . . . . 6-3
Normal Operation Error and Warning/Status
Messages. . . . . . . . . . . . . . . . . . . . 6-8
6-3
TROUBLESHOOTING . . . . . . . . . . . . . . . 6-10
6-4
ROUTINE MAINTENANCE
Cleaning the Fan Filter. .
Cleaning the Data Display
Replacing the Line Fuse .
. .
. .
. .
. .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
. . . .
. . .
. . .
. . .
.
.
.
.
.
.
.
.
6-13
6-13
6-13
6-14
Chapter 6
Operator Maintenance
6-1
6-2
INTRODUCTION
This chapter provides the information necessary for operator maintenance of the signal generator. Operator maintenance is limited to
troubleshooting and repairs that can be made without removing the
instrument covers.
ERROR AND
WARNING/STATUS
MESSAGES
During normal operation, the 681XXC generates error messages to indicate internal malfunctions, abnormal signal generator operations, or
invalid signal inputs or data entries. It also displays warning messages to alert the operator to conditions that could result in inaccurate
signal generator output. In addition, status messages are displayed to
remind the operator of current menu selections or settings.
Self-Test
Error
Messages
The 681XXC firmware includes internal diagnostics
that self-test the instrument. These self-test diagnostics perform a brief go/no-go test of most of the
instrument PCBs and other internal assemblies.
CAUTION
During self-test with RF OUTPUT set to ON, the output
power level is set to 0 dBm. Always disconnect sensitive
equipment from the unit before performing self-test.
You can perform an instrument self-test at any time
during normal operation by pressing SYSTEM and
then Selftest .
If the signal generator fails self-test, an error message(s) is displayed on the front panel data display.
These error messages describe the malfunction and,
in most cases, provide an indication of what has
failed. Table 6-1, next page, is a summary listing of
the self-test error messages. Included for each is a
description of the probable cause(s), whether or not
the 681XXC is still operable, and if operable,what
operational degradation can be expected.
681XXC OM
6-3
OPERATOR
MAINTENANCE
ERROR AND WARNING/
STATUS MESSAGES
WARNING
Self-test error messages normally indicate the failure of an
internal component or assembly of the signal generator.
There are no operator serviceable components inside. Refer
servicing of the instrument to qualified service technicians.
To prevent the risk of electrical shock or damage to precision
components, do not remove the equipment covers.
Table 6-1.
Self-Test Error Messages (1 of 4)
Error Message
Description/Remarks
Error 100
DVM Ground Offset Failed
Indicates a calibration-related problem. Do Not Attempt to Operate! Refer the
instrument to a qualified service technician.
Error 101
DVM Positive 10V Reference
Indicates either a calibration-related problem or a defective+10 Volt reference. Do
not Attempt to Operate! Refer the instrument to a qualified service technician.
Error 102
DVM Negative 10V Reference
Indicates either a calibration-related problem or a defective –10 Volt reference . Do
not Attempt to Operate! Refer the instrument to a qualified service technician.
Error 105
Power Supply Voltage(s) out
of Regulation
Indicates one or more of the voltages from the power supply are out of regulation.
Do Not Attempt to Operate! Refer the instrument to a qualified service technician.
Error 106
Power Supply not Locked
Indicates the power supply is not phase-locked to the 400 kHz reference frequency.
The 681XXC is still operable in a degraded mode. The RF output may contain more
spurious signals than normal.
Error 107
Sweep Time Check Failed
Indicates the sweep timing is out of tolerance or has failed. If analog sweeps can be
obtained, the 681XXC is still operable in a degraded mode. If analog sweeps can
not be obtained, the 681XXC is operable only in CW or step sweep frequency
modes.
Error 108
Crystal Oven Cold
Indicates the 100 MHz crystal oven or the Option 16 high-stability 10 MHz crystal
oscillator has not reached operating temperature. The 681XXC is still operable, but
frequency accuracy and stability may be degraded.
Error 109
The 100MHz Reference is not
Locked to the External
Reference
Indicates the reference loop is not phase-locked to the external 10 MHz reference.
The reference loop may phase-lock to the internal 100 MHz time base; consequently, the 681XXC would continue to operate normally.
Error 110
The 100MHz Reference is not
Locked to the High Stability
10MHz Crystal Oscillator
Indicates the reference loop is not phase-locked to the optional, high stability
10 MHz crystal oscillator. The reference loop may phase-lock to the internal
100 MHz time base; consequently, the 681XXC would continue to operate normally.
6-4
681XXC OM
OPERATOR
MAINTENANCE
Table 6-1.
ERROR AND WARNING/
STATUS MESSAGES
Self-Test Error Messages (2 of 4)
Error Message
Description/Remarks
Error 111
Fine Loop Osc Failed
Indicates one or more of the oscillators within the fine loop is not phase-locked. The
681XXC is still operable but the accuracy and stability of frequency outputs are
greatly reduced.
Error 112
Coarse Loop Osc Failed
Indicates the coarse loop oscillator is not phase-locked. The 681XXC is still
operable but the accuracy and stability of the frequency outputs are greatly
reduced.
Error 113
Yig Loop Osc Failed
Indicates the YIG loop is not phase-locked. The 681XXC is still operable but the accuracy and stability of the frequency outputs are greatly reduced.
Error 114
Down Converter LO not Locked
Indicates the local oscillator in the down converter assembly is not phase-locked.
The 681XXC is still operable but the accuracy and stability of frequency outputs below 2 GHz is greatly reduced.
Error 115
Not Locked Indicator Failed
Indicates failure of the not phase-locked indicator circuit. The 681XXC is still
operable but an error message will not appear on the data display when the output
frequency is not phase-locked.
Error 116
FM Loop Gain Check Failed
Indicates FM loop has failed or the loop gain is out of tolerance. The 681XXC is still
operable but frequency accuracy and stability are degraded.
Error 117
Linearizer Check Failed
Indicates a failure of the Linearizer DAC on the A12 PCB. The 681XXC is still
operable but frequency accuracy of the RF output is degraded.
Error 118
Switchpoint DAC Failed
Indicates a failure of the Switchpoint DAC on the A12 PCB. The 681XXC will not
produce analog sweeps but should operate normally in CW and step sweep modes.
Error 119
Center Frequency Circuits
Failed
Indicates a failure of the center frequency circuitry on the A12 PCB. Do Not
Attempt to Operate! Refer the instrument to a qualified service technician.
Error 120Delta-F Circuits Failed
Indicates a failure of the DF Width DAC on the A12 PCB. The 681XXC will not
generate DF analog sweeps but should produce DF step sweeps.
Error 121
Unleveled Indicator Failed
Indicates failure of the not leveled detector circuitry on the A10 PCB. The 681XXC
is still operable but a warning message will not appear when the RF output goes
unleveled.
Error 122
Level Reference Failed
Indicates a failure of the level reference circuitry on the A10 PCB. Use caution and
always determine the output power level when operating the 681XXC in this condition.
Error 123
Detector Log Amp Failed
Indicates a failure of the level detector log amplifier circuitry on the A10 PCB. Use
caution and always determine the output power level when operating the 681XXC
in this condition.
Error 124
Full Band Unlocked and Unleveled
Indicates a failure of both YIG-tuned oscillators. Do Not Attempt to Operate! Refer
the instrument to a qualified service techician.
681XXC OM
6-5
OPERATOR
MAINTENANCE
Table 6-1.
ERROR AND WARNING/
STATUS MESSAGES
Self-Test Error Messages (3 of 4)
Error Message
Description/Remarks
Error 125
8.4 – 20 GHz Unlocked and
Unleveled
Indicates a failure of the 8.4 to 20 GHz YIG-tuned oscillator. Do Not Attempt to
Operate! Refer the instrument to a qualified service techician.
Error 126
2 – 8.4 GHz Unlocked and
Unleveled
Indicates a failure of the 2 to 8.4 GHz YIG-tuned oscillator. Do Not Attempt to Operate! Refer the instrument to a qualified service techician.
Error 127
Detector Input Circuit
Failed
Indicates a failure of the level detector input circuitry on the A10 PCB. Use caution
and always determine the output power level when operating the 681XXC in this
condition.
Error 128
.01 – 2 GHz Unleveled
Indicates a failure of the Down Converter leveling circuitry. The 681XXC operates
normally but will have unleveled RF output in the 0.01 - 2 GHz frequency range.
Error 129
Switched Filter or Level
Detector Failed
Indicates a failure of either the switched filter or level detector circuitry. The 681XXC
may or may not produce an RF output. Use caution and always determine the output power level when operating the 681XXC in this condition.
Error 130
2 – 3.3 GH Switched Filter
Indicates a failure in the 2 - 3.3 GHz switched filter path within the switched filter
assembly. The 681XXC may or may not produce an RF output in this frequency
range. Use caution and always determine the output power level when operating
the 681XXC in this condition.
Error 131
3.3 – 5.5 GH Switched Filter
Indicates a failure in the 3.3 - 5.5 GHz switched filter path within the switched filter
assembly. The 681XXC may or may not produce an RF output in this frequency
range. Use caution and always determine the output power level when operating
the 681XXC in this condition.
Error 132
5.5 – 8.4 GH Switched Filter
Indicates a failure in the 5.5 - 8.4 GHz switched filter path within the switched filter
assembly. The 681XXC may or may not produce an RF output in this frequency
range. Use caution and always determine the output power level when operating
the 681XXC in this condition.
Error 133
8.4 – 13.25 GH Switched Filter
Indicates a failure in the 8.4 - 13.25 GHz switched filter path within the switched
filter assembly. The 681XXC may or may not produce an RF output in this frequency range. Use caution and always determine the output power level when
operating the 681XXC in this condition.
Error 134
13.25 – 20 GH Switched Filter
Indicates a failure in the 13.25 - 20 GHz switched filter path within the switched filter
assembly. The 681XXC may or may not produce an RF output in this frequency
range. Use caution and always determine the output power level when operating
the 681XXC in this condition.
Error 135
Modulator or Driver Failed
Indicates a failure of the modulator in the switched filter assembly or the modulator
driver circuitry on the A9 PCB. The 681XXC may or may not produce an RF output.
Use caution and always determine the output power level when operating the
681XXC in this condition.
6-6
681XXC OM
OPERATOR
MAINTENANCE
Table 6-1.
ERROR AND WARNING/
STATUS MESSAGES
Self-Test Error Messages (4 of 4)
Error Message
Description/Remarks
Error 138
SDM Unit or Driver Failed
Indicates a failure of the switched doubler module (SDM) or SDM bias regulator circuitry on the A14 PCB. The 681XXC is still operable but it will not produce an RF
output in the 20 - 40 GHz frequency range.
Error 139
32 – 40 GHz SDM Section Failed
Indicates a failure in the 32 - 40 GHz switched doubler filter path within the SDM.
The 681XXC is still operable but it will not produce an RF output in the 32 - 40 GHz
frequency range.
Error 140
25 – 32 GHz SDM Section Failed
Indicates a failure in the 25 - 32 GHz switched doubler filter path within the SDM.
The 681XXC is still operable but it will not produce an RF output in the 25 - 32 GHz
frequency range.
Error 141
20 – 25 GHz SDM Section Failed
Indicates a failure in the 20 - 25 GHz switched doubler filter path within the SDM.
The 681XXC is still operable but it will not produce an RF output in the 20 - 25 GHz
frequency range.
Error 142
Sample and Hold Circuit
Failed
Indicates a failure of the sample and hold circuitry on the A10 PCB. The 681XXC
still operates normally but the RF output may be unleveled during square wave
modulation.
Error 143
Slope DAC Failed
Indicates a failure of the level slope DAC on the A10 PCB. The 681XXC still
operates normally but RF output level flatness may be affected during analog
frequency sweeps.
681XXC OM
6-7
OPERATOR
MAINTENANCE
ERROR AND WARNING/
STATUS MESSAGES
Normal
Operation
Error and
Warning/
Status
Messages
When an abnormal condition is detected during operation, the 681XXC displays an error message to
indicate that the output is abnormal or that a signal
input or data entry is invalid. It also displays warning messages to alert the operator to conditions that
could cause an inaccurate signal generator output.
Status messages to remind the operator of current
menu selections or settings are also generated.
Table 6-2 is a summary list of possible error messages that can be displayed during normal operations. Table 6-3 is a summary list of possible
warning/status messages.
Table 6-2.
Possible Error Messages during Normal Operations
Error Message
6-8
Description
ERROR
Displayed (on the frequency mode title bar) when (1) the
output frequency is not phase-locked or (2) an invalid
entry causes a frequency range error.
LOCK ERROR
Displayed (in the frequency parameters area) when the
output frequency is not phase-locked. The frequency
accuracy and stability of the RF output is greatly reduced.
Normally caused by an internal component failure. Run
self-test to verify malfunction.
RANGE
Displayed (in the frequency parameters area) when (1)
the analog sweep start frequency entered is greater than
the stop frequency, (2) the dF value entered results in a
sweep outside the range of the instrument, (3) the step
size value entered is greater than the sweep range, (4)
the number of steps entered results in a step size of less
than 1 kHz (0.1 Hz with Option 11) or 0.1 dB (0.001 mV),
or (5) the step sweep time entered divided by the number
of steps entered does not result in a dwell time of
<10 ms. Entering valid values usually clears the error.
ERR
Displayed (in the modulation status area) when either the
external AM modulating signal or the external FM
modulating signal exceeds the input voltage range. In addition, the message “Reduce AM (FM) Input Level” appears at the bottom of the AM (FM) status display. AM
(FM) will be turned off until the modulating signal is in the
input voltage range.
681XXC OM
OPERATOR
MAINTENANCE
ERROR AND WARNING/
STATUS MESSAGES
Table 6-3.
Possible Warning/Status Messages during Normal Operation
Warning/Status
Message
681XXC OM
Description
OVN COLD
This warning message indicates that the 100 MHz
Crystal oven (or the 10 MHz Crystal oven if Option 16 is
installed) has not reached operating temperature.
Normally displayed during a cold start of the signal generator. If the message is displayed during normal
operation, it could indicate a malfunction. Run self-test to
verify.
UNLEVELED
Displayed when the RF output goes unleveled. Normally
caused by exceeding the specified leveled-power rating.
Reducing the power level usually clears the warning
message.
If the warning message is displayed only when AM is
selected ON, the modulating signal may be driving the
RF output unleveled. Reducing the modulating signal or
adjusting the power level usually clears the warning.
UNLOCKED
When Unlocked Narrow FM or Unlocked Wide FM is
selected ON, this warning message appears indicating
that the instrument is not phase-locked during this FM
mode of operation.
EXTL REF
This status message indicates that an external 10 MHz
signal is being used as the reference signal for the
681XXC.
OFFSET
This status message indicates that a constant (offset)
has been applied to the displayed power level.
SLOPE
This status message indicates that a power slope
correction has been applied to the ALC.
USER 1...5
This status message indicates that a user level flatness
correction power-offset table has been applied to the
ALC.
SS MODE
This status message indicates that the 681XXC has
been placed in a source lock mode for operation with a
360B Vector Network Analyzer.
6-9
OPERATOR
MAINTENANCE
6-3
TROUBLESHOOTING
TROUBLESHOOTING
Table 6-4 provides procedures for troubleshooting common malfunctions encountered during operation of the signal generator. Included
are procedures for troubleshooting faults that do not produce error
messages, such as, failure to power up and unexpected shutdown.
Table 6-4.
Troubleshooting (1 of 3)
Signal Generator will not turn on
(OPERATE light is OFF)
Normal Operation: When the 681XXC is connected to the power
source, the OPERATE light should illuminate and the instrument
should power up.
Step 1
Step 2
Step 3
Disconnect the 681XXC from the power source, then check
the line fuse on the rear panel.
q
If the fuse is defective, replace (see page 6-14).
q
If the fuse is good, go to the next step.
Check to see if power is available at the power receptacle.
q
If not, move to a working receptacle.
q
If power is available, go to the next step.
Check the power cable.
q
If defective, replace.
q
If good, call a service technician.
Signal Generator will not turn on
(OPERATE light is ON)
Normal Operation: When the 681XXC is connected to the power
source, the OPERATE light should illuminate and the instrument
should power up.
q
6-10
If the OPERATE light illuminates but the unit fails to
power up, the 681XXC has an internal component failure. Call a service technician.
681XXC OM
OPERATOR
MAINTENANCE
TROUBLESHOOTING
Table 6-4.
Troubleshooting (2 of 3)
Signal Generator Quits During Operation
(OPERATE light remains on)
Trouble Description: The signal generator operates for some time,
then shuts down (OPERATE light remains on). After a short period, the
signal generator resumes normal operation. This is an indication that
the 681XXC has reached an excessive operating temperature.
Step 1
Check that the fan is still operating during the time that the
instrument is shut down.
q
If the fan is still operating, clean the air filter (see page
6-13).
q
If the fan is not operating, call a service technician.
LOCK ERROR is Displayed
Trouble Description: This message is displayed in the frequency parameters area to indicate that the output frequency is not phaselocked. It is normally caused by an internal component failure.
Step 1
681XXC OM
Perform a self-test of the signal generator by pressing the
System Menu soft-key Selftest .
q
If self-test does not result in an error message(s), resume
normal operation.
q
If an error message(s) is displayed, call a service technician.
6-11
OPERATOR
MAINTENANCE
TROUBLESHOOTING
Table 6-4.
Troubleshooting (3 of 3)
UNLEVELED is Displayed
Trouble Description: This message is displayed to indicate that the
RF output is unleveled.
Step 1
Check that the output power does not exceed the specified
leveled-power rating and that the RF OUTPUT connector is
terminated into a 50W load.
q
Reduce the power level to not exceed the specified
leveled-power rating or terminate the RF OUTPUT
connector with a 50W load.
q
If error message remains displayed, call a service
technician.
RANGE is Displayed
Trouble Description: This message is displayed in the frequency
parameters area to indicate that (1) the analog sweep start frequency
entered is greater than the stop frequency, (2) the dF value entered
results in a sweep outside the range of the instrument, (3) the step size
value entered is greater than the sweep range, (4) the number of steps
entered results in a step size of less than 1 kHz (0.1 Hz with Option 11)
or 0.1 dB (0.01 mV), or (5) the step sweep time entered divided by the
number of steps entered results in a dwell time of <10 ms.
Step 1
6-12
Check that (1) the analog sweep start frequency entered is
not greater than the stop frequency, (2) the dF value entered
does not try to set the frequency sweep outside the range of
the signal generator, (3) the step size entered is not greater
than F2 minus F1, (4) the number of steps entered does not
result in a step size that is smaller than the resolution of the
instrument, or (5) the step sweep time and number of steps
does not result in a dwell time of <10 ms.
q
Enter a valid sweep start frequency, dF value, step size,
or number of steps.
q
If the error message remains displayed, call a service
technician.
681XXC OM
OPERATOR
MAINTENANCE
6-4
ROUTINE MAINTENANCE
ROUTINE
MAINTENANCE
Routine maintenance that can be performed by the operator consists
of cleaning the fan filter, cleaning the data display, and replacing a
defective line fuse.
Cleaning the
Fan Filter
Figure 6-1.
Step 1
Remove the filter guard from the rear
panel by pulling out on the four panel fasteners holding them in place (Figure 6-1).
Step 2
Vacuum the honeycomb filter to clean it.
Step 3
Install the filter guard back on the rear
panel.
Step 4
Press in on the panel fasteners to secure
the filter guard to the rear panel.
Removing/Replacing the Fan Filter Guard
Cleaning the
Data Display
681XXC OM
The 681XXC must always receive adequate ventilation. A blocked fan filter can cause the instrument
to overheat and shut down. Check and clean the
rear panel fan honeycomb filter periodically. Clean
the fan honeycomb filter more frequently in dusty
environments. Clean the filter as follows:
The data display of the signal generator is protected
by a plastic display filter. To clean the display filter,
use mild soap or detergent and water, or a commercial window cleaner. When cleaning use a soft, lint-
6-13
OPERATOR
MAINTENANCE
ROUTINE
MAINTENANCE
free cloth. Do not use abrasive cleaners, tissues, or
paper towels which can scratch the plastic surface.
Replacing the
Line Fuse
The value of the line fuse used in the 681XXC is determined by the line voltage selection—a 5A type T
line fuse for 110 Vac line voltage; a 2.5A type T line
WARNING
Before changing the fuse, always remove the power cord
from the power outlet. There is the risk of receiving a fatal
electric shock if the fuse is replaced with the power cord connected.
Always use a new fuse of the type and rating specified by
the fuse markings on the rear panel of the instrument.
fuse for 220 Vac line voltage. These line fuse values
are printed on the rear panel next to the fuse holder.
Figure 6-2.
6-14
Replacing the Line Fuse
Step 1
Disconnect the 681XXC from the power
source.
Step 2
Using a small flat-blade screwdriver, turn
the fuse cap counter-clockwise and remove the fuse holder.
681XXC OM
OPERATOR
MAINTENANCE
681XXC OM
ROUTINE
MAINTENANCE
Step 3
Replace the fuse in the fuse holder.
Step 4
Install the fuse holder in the rear panel.
Using the screwdriver, rotate the fuse cap
clockwise to secure the fuse holder in
place.
Step 5
Reconnect the signal generator to the
power source.
6-15/6-16
Chapter 7
Use With Other Instruments
Table of Contents
7-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . 7-3
7-2
MASTER-SLAVE OPERATION . . . .
Connecting the Instruments . . . . .
Initiating Master-Slave Operation . .
Master-Slave Operation . . . . . . .
Master-Slave Operation in VNA Mode
Terminating Master-Slave Operation .
7-3
USE WITH A 56100A SCALAR NETWORK
ANALYZER . . . . . . . . . . . . . . . . . . . . . 7-10
Connecting the 681XXC to the 56100A . . . . . 7-10
7-4
USE WITH A 360B VECTOR NETWORK
ANALYZER . . . . . . . . . . . . . . . . . . .
Connecting the 681XXC to the 360B . . . .
Modes of Operation . . . . . . . . . . . . .
Source Lock Mode . . . . . . . . . . . . .
Tracking Mode . . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
7-12
7-12
7-13
7-13
7-15
USE WITH A HP8757D SCALAR NETWORK
ANALYZER . . . . . . . . . . . . . . . . . . .
Connecting the 681XXC to the HP8757D . .
Setting Up the 681XXC . . . . . . . . . . .
Initiating HP8757D SNA Operation . . . . .
.
.
.
.
.
.
.
.
7-16
7-16
7-17
7-19
7-5
.
.
.
.
.
.
. . . .
. . .
. . .
. . .
. . .
. . .
.
.
.
.
.
.
.
.
.
.
.
.
7-4
7-4
7-5
7-7
7-7
7-9
Chapter 7
Use With Other Instruments
7-1
INTRODUCTION
681XXC OM
This chapter provides information and instructions for using the Series 681XXC Synthesized Signal Generator with other Anritsu instuments. It contains the following:
q
Instructions for interconnecting and operating any two 68XXXC
and/or 68XXXB instruments in a master-slave configuration.
q
Instructions for connecting the 681XXC to an Anritsu Model
56100A Scalar Network Analyzer so that it can be used as a
signal source for the analyzer.
q
Instructions for connecting the 681XXC to a Anritsu Model 360B
Vector Network Analyzer and configuring the signal generator so
that it can be used as a signal source for the analyzer.
q
Instructions for connecting the 681XXC to a Hewlett Packard
Model 8757D Scalar Network Analyzer and setting up the signal
generator so that it can be used as a signal source for the analyzer.
7-3
USE WITH
OTHER INSTRUMENTS
7-2
MASTER-SLAVE
OPERATION
Figure 7-1.
MASTER-SLAVE
OPERATION
Master-slave operation consists of connecting any two 68XXXC and/or
68XXXB instruments together and configuring them so that they produce CW and synchronized, swept output signals at an operatorselectable frequency offset. One instrument (the Master) controls the
other (the Slave) via interface cables between their rear panel AUX I/O
and SERIAL I/O connectors. The two units are phase-locked together
by connecting them to the same 10 MHz reference time base.
68XXXB/68XXXC Configuration for Master-Slave Operation
Connecting
the Instruments
NOTES
When connecting two instruments
together for Master-Slave operations, always use a Anritsu
Master-Slave interface cable set,
Part No. ND36329.
If a Model 56100A Scalar Network
Analyzer is being used with the
master-slave configuration, (1) connect the AUX I/O cable end labeled
“SNA” to the rear panel AUX I/O
connector on the 56100A SNA and
(2) connect a dedicated system bus
cable (P/N 2100-1) between the
Master instrument rear panel
IEEE-488 GPIB connector and the
56100A SNA rear panel DEDICATED GPIB connector.
7-4
Connect the two instruments, shown in Figure 7-1,
as follows:
Step 1
Connect the 3-port AUX I/O cable end labeled “MASTER” to the rear panel AUX
I/O connector on the Master instrument.
Connect the AUX I/O cable labeled
“SLAVE” to the rear panel AUX I/O connector on the Slave instrument.
Step 2
Connect the ends of the flat interface cable to the rear panel Serial I/O connectors
on the Master and Slave instruments.
Step 3
Connect one end of a coaxial cable to the
rear panel 10 MHz REF OUT connector on
the Master instrument. Connect the other
end to the rear panel 10 MHz REF IN connector on the Slave instrument.
681XXC OM
USE WITH
OTHER INSTRUMENTS
MASTER-SLAVE
OPERATION
Step 4
Initiating
Master-Slave
Operation
Connect the Master instrument RF OUTPUT and the Slave instrument RF OUTPUT to the appropriate connections on the
DUT.
The following paragraphs describe how to set up
both instruments to perform master-slave operations. Use the CW Frequency Mode menu map
(Chapter 4, Figure 4-2) to follow the menu sequences.
To initiate master-slave operation, turn on both
instruments and place them in CW mode. The CW
Menu (below) is displayed.
NOTE
Master-slave operations are always
initiated in the CW frequency
mode. Once initiated, you then can
change to a sweep frequency mode
of operation by selecting the desired frequency mode on the Master
instrument.
On the Master instrument, press Master Slave to
go to the Master-Slave Menu display (below).
This menu lets you perform the following:
q
q
q
q
q
Go to the Slave Frequencies List menu.
Set the dF frequency for the Slave unit.
Set the Slave unit’s main power level (L1).
Set the alternate sweep power level (L2) for
the Slave unit.
Turn master-slave operation on and off.
Press Slave Freqs to go to the Slave Frequencies
List Menu display (next page).
681XXC OM
7-5
USE WITH
OTHER INSTRUMENTS
MASTER-SLAVE
OPERATION
NOTE
Upon reset, the slave frequencies
(F0 - F9 and M0 - M9) return to the
default values shown here.
This menu lets you edit the listed frequencies for
the Slave instrument.
Use the cursor control key to select a frequency parameter from the list, then press Edit to edit its
value. Edit the current frequency parameter value
using the cursor control key or rotary data knob or
enter a new value using the key pad and approriate
termination key. Press Edit again to close the open
frequency parameter.
When you are finished editing the slave frequencies,
press Previous Menu to return to the Master-Slave
Menu (below).
The Master-Slave menu lets you set the dF frequency and L1 and L2 power level parameters for
the Slave unit.
Press Slave DF to open the dF frequency parameter.
Press Slave L1 to open the main power level parameter.
Press Slave L2 to open the alternate sweep power
level parameter.
Open the parameter you wish to change, then edit
the current value using the cursor control key or rotary data knob or enter a new value using the key
7-6
681XXC OM
USE WITH
OTHER INSTRUMENTS
MASTER-SLAVE
OPERATION
pad and appropriate termination key. When you
have finished setting the open parameter, close it by
pressing its menu soft-key or by making another
menu selection.
Press Enable to begin master-slave operation.
Press CW to return to the CW Menu display.
Master-Slave
Operation
During master-slave operation, the Slave unit is in
remote mode under the direct control of the Master
unit. The Slave unit displays the following:
q
q
q
Its output CW frequency or sweep frequency
range.
Its output power level.
The messages Remote and Local Lockout.
The CW/sweep frequency settings on the Master
unit define the master sweep, and the corresponding
frequency settings on the Slave unit define the slave
sweep. For example, if slave frequency F1 is set to
4 GHz and slave frequency F2 is set to 12 GHz, then
the Slave unit will sweep from 4 to 12 GHz whenever the F1-F2 sweep range is selected on the Master unit. The Master unit will sweep from F1-F2
with the values of F1 and F2 defined in the Master
unit’s frequency list.
NOTE
The 56100A SNA, when being used
with the master-slave configuration, will not display markers.
Master-Slave
Operation in
VNA Mode
In the VNA mode of master-slave operation, a Slave
unit is coupled to a Master instrument that is connected to a Model 360B Vector Network Analyzer in
a source or dual source configuration. (Operating instructions for the vector network analyzer can be
found in the Model 360B VNA Operation Manual,
P/N 10410-00110.) The following paragraphs describe how to set up both instruments to perform
master-slave operations in the VNA mode.
Place both instruments in CW mode. Then, on the
Master unit, press Master Slave to go to the
Master-Slave Menu display (page 7-5).
At the Master-Slave menu, press Slave Freqs to go
to the Slave Frequencies List Menu display (next
page).
681XXC OM
7-7
USE WITH
OTHER INSTRUMENTS
MASTER-SLAVE
OPERATION
Press VNA Menu to go to the VNA Menu display
(below).
This menu lets you set the frequency offset and output power level for the Slave instrument in the VNA
mode.
Press VNA Offset to open the slave frequency offset
parameter.
Press VNA Level to open the slave output power
level parameter.
SLAVE
During master-slave operations in
VNA mode, this error message is
d isplay ed on the Mas ter
instrument when the slave offset
value entered results in a CW frequency or frequency sweep outside
the range of the slave unit. Entering a valid offset value clears the
error.
Open the parameter you wish to change, then edit
the current value using the cursor control key or rotary data knob or enter a new value using the key
pad and appropriate termination key. When you
have finished setting the open parameter, close it by
pressing its menu soft-key or by making another
menu selection.
Press Previous Menu to return to the Slave Frequencies List Menu display.
Return to the Master-Slave menu and press Enable
to begin master-slave operation.
7-8
681XXC OM
USE WITH
OTHER INSTRUMENTS
MASTER-SLAVE
OPERATION
Terminating
Master-Slave
Operation
The following describes how to terminate masterslave operation and return the Slave instrument to
local (front panel) control.
On the Master instrument, select CW mode.
At the CW Menu, press Master Slave to go to the
Master Slave Menu display.
At the Master Slave Menu display, press Enable .
This terminates master-slave operation and returns
the Slave instrument to local (front panel) control.
681XXC OM
7-9
USE WITH
OTHER INSTRUMENTS
7-3
USE WITH A 56100A
SCALAR NETWORK
ANALYZER
USE WITH A 56100A SCALAR
NETWORK ANALYZER
The 681XXC is directly compatible with the Anritsu Model 56100A
Scalar Network Analyzer (SNA). The following paragraphs provide
instructions for connecting the signal generator to the 56100A SNA so
that is can be used as a signal source for the analyzer. Operating instructions for the network analyzer can be found in the Model 56100A
Scalar Network Analyzer Operation Manual, P/N 10410-00193.
5 6 1 0 0 A S C A L A R N E T W O R K A N A L Y Z E R
>
D E D IC A T E D
G P IB
>
A U X I/O
A
A U X I/O
B
S W R
A U T O T E S T E R
IE E E -4 8 8 G P IB
6 8 1 X X C S IG N A L G E N E R A T O R
D U T
D E T E C T O R
Figure 7-2.
56100A SNA to 681XXC Signal Generator Connections
Connecting
the 681XXC to
the 56100A
NOTES
The 681XXC's GPIB address should
be set to 5 (the default address setting) for operation with a 56100A
SNA. To verify or change the GPIB
address setting refer to Configuring
the GPIB on page 3-85.
Connect the 681XXC signal generator to the 56100A
Scalar Network Analyzer as shown in Figure 7-2.
Step 1
Connect one end of the Auxiliary I/O cable (P/N 806-7) to the 56100A rear panel
AUX I/O connector. Connect the other end
of the cable to the 681XXC rear panel
AUX I/O connector.
Step 2
Connect one end of the dedicated system
bus cable (P/N 2100-1) to the 56100A rear
panel DEDICATED GPIB connector. Connect the other end of the cable to the
681XXC rear panel IEEE-488 GPIB connector.
Step 3
Turn on the 681XXC and the 56100A. The
system is now ready to operate.
The 56100A SNA will only accept
and display the nine video markers,
F1 thru F9, from the 681XXC.
When performing amplifier testing
only use the 681XXC power level,
L1.
7-10
681XXC OM
USE WITH
OTHER INSTRUMENTS
7-4
USE WITH A 360B VECTOR
NETWORK ANALYZER
The 681XXC signal generator is compatible with the Anritsu Model
360B Vector Network Analyzer (VNA). The following paragraphs provide instructions for connecting the 681XXC to the 360B VNA and configuring the signal generator so that it can operate as a signal source
for the analyzer. Operating instructions for the vector network analyzer can be found in the Model 360B Vector Network Analyzer Operation Manual, P/N 10410-00110.
USE WITH A 360B
VECTOR NETWORK
ANALYZER
M O D E L 3 6 0 B V E C T O R N E T W O R K A N A L Y Z E R
S O U R C E C O N T R O L
S Y S T E M B U S
1 0 M H z R E F O U T
E X T F M
O L O C K
O U T P U T
P O R T 1
P O R T 2
M O D E L S 3 6 1 X A
A N D 3 6 2 X A
T E S T S E T S
R F IN P U T
G P IB
D U T
F M
IN
S E M I-R IG ID
C O A X IA L C A B L E
M O
6 8 1
S IG
G E
1 0 M H z R E F IN
IE E E -4 8 8 G P IB
D E
X X
N A
N E
L
C
L
R A T O R
R F
O U T P U T
Figure 7-3.
360B VNA to 681XXC Signal Generator Connections
Connecting
the 681XXC to
the 360B
681XXC OM
Connect the 681XXC signal generator to the 360B
Vector Network Analyzer as shown in Figure 7-3.
Step 1
Connect one end of a coaxial cable to the
681XXC rear panel FM IN connector. Connect the other end to the 360B rear panel
EXT FM F LOCK OUTPUT connector.
Step 2
Connect one end of a coaxial cable to the
681XXC rear panel 10 MHz REF IN connector. Connect the other end to the 360B
rear panel 10 MHz REF OUT connector.
7-11
USE WITH
OTHER INSTRUMENTS
USE WITH A 360B VECTOR
NETWORK ANALYZER
If the 681XXC contains an Option 16
high-stability time base, connect the coaxial cable between the 681XXC rear panel
10 MHz REF OUT connector and the 360B
rear panel 10 MHz REF IN connector.
Step 3
Connect one end of a GPIB cable, 1 meter
in length, to the 681XXC rear panel
IEEE-488 GPIB connector. Connect the
other end of the cable to the 360B rear
panel SOURCE CONTROL SYSTEM BUS
connector.
Step 4
Turn on the 681XXC and configure it as
described in the following paragraphs.
Modes of
Operation
There are two 360B VNA receiver modes of operation that are used with the 681XXC—the 360B
source lock mode and the 360B tracking mode. The
configuration and operation of the 681XXC for both
modes of operation are described in the following
paragraphs.
Source Lock
Mode
When operating in source lock mode, the 360B
phase locks the frequency output of the 681XXC.
This is accomplished by sending a dc control voltage
to the FM input on the 681XXC. Due to the inherent
resolution of the 360B’s synthesized local oscillators,
frequency resolution is limited to 100 kHz intervals.
Source Lock Mode Configuration
In order for the 681XXC to operate with a 360B in
source lock mode, the signal generator must be
placed in the SS Mode of operation.
To place the signal generator in SS Mode, first press
the main menu key SYSTEM . At the System Menu
display, press Config . The System Configuration
Menu (below) is displayed.
7-12
681XXC OM
USE WITH
OTHER INSTRUMENTS
USE WITH A 360B VECTOR
NETWORK ANALYZER
At the System Configuration menu, press GPIB .
The Configure GPIB Menu (below) is displayed.
Verify that the GPIB address and terminator shown
on the display match the System Bus source address
and data terminator that are set on the 360B VNA.
SS MODE
When SS Mode is selected on, this
message is displayed (in the frequency mode title bar) on all menu
displays to remind the operator
that the 681XXC is in a source lock
mode.
If the address of the 681XXC on the System Bus
needs changing, press GPIB Address . Enter the
new address using the cursor control key or the data
entry keypad and the terminator key
HZ
ms
ADRS
The new GPIB address will appear on the display.
NOTES
A 360B VNA and a 68137C Source
in SS Mode should not be operated
below 2.1 GHz because it may fail to
lock.
A 360B VNA that is using a 3612A,
3613A, 3622A, 3623A, or 3631A
Test Set and a 681XXC Source in SS
Mode should not be operated above
60 GHz because it will fail to lock.
For operations above 60 GHz, use
the 681XXC Source in tracking
mode.
681XXC OM
To change the data terminator, press Line Term to
select the correct GPIB data delimiter.
Press SS Mode to turn on SS mode. This places the
681XXC in a source lock mode.
The signal generator is now configured for 360B
source lock mode operation.
Initiating 360B Source Lock Mode Operations
Turn on the 360B and configure it for source lock
mode of operation. (Refer to the 360B VNA operation manual.) Once configured, the 360B takes control of the signal generator.
When the 360B takes control, the display of all parameters on the 681XXC is disabled and the messages SS MODE, Secure Mode Active, and Remote
appear on the front panel display.
7-13
USE WITH
OTHER INSTRUMENTS
USE WITH A 360B VECTOR
NETWORK ANALYZER
Terminating 360B Source Lock Mode Operations
To terminate 360B VNA source lock mode operations, you must first return the 681XXC to local control and then turn off the SS Mode.
To return the 681XXC to local control, turn off the
360B VNA.
On the 681XXC, press SYSTEM , then Reset . This
turns off the Secure mode.
Next, press SYSTEM , then Config to access the
System Configuration Menu display.
At the System Configuration Menu,press GPIB .
When the Configure GPIB Menu (shown below) is
displayed, press SS Mode to turn the SS mode off.
Tracking
Mode
When operating in tracking mode, the 360B steers
its second local oscillator frequency and phase signal so as to phase-lock itself to the reference signal
from the 681XXC. Due to the inherent resolution of
the 360B’s frequency readout, frequency resolution
is limited to 1 kHz intervals.
Tracking Mode Configuration
In order for the 681XXC to operate with a 360B in
tracking mode, the signal generator must be operating in normal mode (SS Mode off). In addition, its
GPIB address and data terminator must match the
System Bus source address and data terminator
that are set on the 360B VNA.
To verify the GPIB address and data terminator or
to turn the SS mode off, press SYSTEM . At the
System Menu display, press Config . When the System Configuration Menu is displayed, press GPIB .
The Configure GPIB Menu (shown below) is displayed.
7-14
681XXC OM
USE WITH
OTHER INSTRUMENTS
USE WITH A 360B VECTOR
NETWORK ANALYZER
If the address of the 681XXC on the System Bus
needs changing, press GPIB Address . Enter the
new address using the cursor control key or the data
entry keypad and the terminator key
HZ
ms
ADRS
The new GPIB address will appear on the display.
To change the data terminator, press Line Term to
select the correct GPIB data delimiter.
To turn SS mode off, press SS Mode .
The signal generator is now configured for 360B
tracking mode operation.
Initiating 360B Tracking Mode Operations
Turn on the 360B and configure it for tracking mode
of operation. (Refer to the 360B VNA operation manual.) Once configured, the 360B should take control
of the signal generator.
When the 360B takes control, the display of all parameters on the 681XXC is disabled and the messages Secure Mode Active and Remote appear on the
front panel display.
Terminating 360B Tracking Mode Operations
To terminate 360B VNA tracking mode operations,
you must first return the 681XXC to local control
and then turn off the Secure mode.
To return the 681XXC to local control, turn off the
360B VNA.
On the 681XXC, press SYSTEM , then Reset . This
turns off the Secure mode.
681XXC OM
7-15
USE WITH
OTHER INSTRUMENTS
7-5
USE WITH A HP8757D
SCALAR NETWORK ANALYZER
The 681XXC signal generator is compatible with the Hewlett Packard
8757D Scalar Network Analyzer (SNA). The following paragraphs provide instructions for connecting the 681XXC to the HP8757D SNA and
setting up the signal generator so that it can operate as a signal
source for the analyzer. Operating instructions for the scalar network
analyzer can be found in the Hewlett Packard 8757D Scalar Network
Analyzer Operation Manual.
USE WITH A HP8757D
SCALAR NETWORK
ANALYZER
S T O P S W E E P
S W P D W E L L IN
S E Q
S Y N C
P O S Z B L A N K
H O R IZ O U T
S W E E P IN
M O D U L A T O R D R IV E
IN
A U X
I/O
0 - 1 0 V
IE E E -4 8 8
G P IB
8 7 5 7 S Y S T E M
IN T E R F A C E
A
6 8 1 X X C
S IG N A L G E N E R A T O R
T o D U T
B
C
R
H P 8 7 5 7 D S C A L A R
N E T W O R K A N A L Y Z E R
T o D U T
S E N S O R
Figure 7-4.
681XXC to HP8757D SNA Connections
Connecting
the 681XXC to
the HP8757D
7-16
Connect the 681XXC signal generator to the
HP8757D scalar network analyzer as shown in
Figure 7-4.
Step 1
Connect one end of a GPIB cable to the
681XXC rear panel IEEE-488 GPIB connector. Connect the other end to the
HP8757D rear panel 8757 SYSTEM INTERFACE connector.
Step 2
Connect one end of a coaxial cable having
BNC connectors to the 681XXC rear
panel
IN connector. Connect the other
end of the cable to the HP8757D rear
panel MODULATOR DRIVE connector.
681XXC OM
USE WITH
OTHER INSTRUMENTS
USE WITH A HP8757D
SCALAR NETWORK ANALYZER
Step 3
Connect the special AUX I/O interface
cable (Anritsu Part No. 806-90) to the
681XXC rear panel AUX I/O connector.
Connect the cable end having BNC connectors as follows:
a. Connect the cable end labeled “SEQ
SYNC” to the HP8757D rear panel
POS Z BLANK connector.
b. Connect the cable end labled “SWP
DWELL IN” to the HP8757D rear
panel STOP SWEEP connector.
c. Connect the cable end labled “HORIZ
OUT” to the HP8757D rear panel
SWEEP IN 0 - 10V connector.
Setting Up
the 681XXC
The 681XXC must be set to GPIB address 19 and in
the 8757D Scalar mode of operation to operate as a
signal source for the SNA. The following paragraphs
describe how to set up the 681XXC to enable the
8757D Scalar GPIB mode.
On the 681XXC front panel, press LINE to place the
signal generator in operation.
Allow the signal generator to warm up, then press
the SYSTEM main menu key. At the System Menu
display, press Config . The System Configuration
Menu (below) is displayed.
At the System Configuration menu, press GPIB .
The Configure GPIB Menu (on the following page) is
displayed.
681XXC OM
7-17
USE WITH
OTHER INSTRUMENTS
USE WITH A HP8757D
SCALAR NETWORK ANALYZER
Press GPIB Address to change the address of the
681XXC on the bus. Enter 19 using the cursor control key or the data entry keypad and the terminator key
HZ
ms
ADRS
The new GPIB address (19) will appear on the display.
Press More to go to the First Additional Configure
GPIB menu (below).
At this menu, press More to go to the Second Additonal Configure GPIB menu (below).
Press 8757D Scalar to enable the 8757D Scalar
GPIB mode. When enabled, the 681XXC will shift to
the analog sweep frequency mode sweeping at the
full range of the instrument.
7-18
681XXC OM
USE WITH
OTHER INSTRUMENTS
USE WITH A HP8757D
SCALAR NETWORK ANALYZER
Initiating
HP8757D
SNA
Operation
681XXC OM
Turn ON the HP8757D to initiate scalar network
analyzer operation. (Refer to the Hewlett Packard
Model 8757D Scalar Network Analyzer Operation
Manual for operating instructions.
7-19/7-20
Appendix A
Rear Panel Connectors
A-1
A-2
A-3
INTRODUCTION
This appendix provides descriptions for the rear panel connectors on a
typical Series 681XXC Synthesized Signal Generator.
REAR PANEL
CONNECTORS
Figure A-1 provides a illustration of the rear panel and describes the
rear panel connectors.
CONNECTOR PINOUT
DIAGRAMS
Figures A-2 and A-3 provide pinout diagrams and descriptions for the
AUX I/O and IEEE-488 GPIB multipin connectors on the rear panel.
681XXC OM
A-1
REAR PANEL
CONNECTORS
2
1
3
1 0 M H z
R E F IN
6
5
4
8
7
1 0 M H z
R E F
O U T
!
C A U T IO N
H O R IZ
O U T
A M
IN
!
W A R N IN G
F O R
P R O
O N L
T Y P
C O
T E
Y W
E A
N T IN
C T IO
IT H
N D R
U E D
N R E P
S P E C
A T E D
F IR
L A
IF IE
F U
N O T E : U S E S L O W
E
T 2
2 2
T
1 1
C E
D
S E
.5 A
0 V
5 A
0 V
B L O
F U S E S O N L Y
1 1 0
2 2 0
> 1 8 k g
H E A V Y W E IG H T
A U X I/O
1 0
9
L IN E
S E L E C T
IN
!
F M
IN
E X T
A L C
IN
- 1 3 2 V A C
- 2 6 4 V A C
- 4 4 0 H z
0 V A m a x
S E R IA L
I/O
IE E E -4 8 8 G P IB
!
W A R N IN G
N O O
A B L E
R E F E
Q U A L
P E
P
R
IF
R A
A R
S E
IE D
T O
T S
R V
P
R S
IN S
IC IN
E R S
E
ID
G
O
R V IC E E .
T O
N N E L
1 3
! C A U T IO N
1 2
N O T E : U S E S L O W B L O
F U S E S O N L Y
W A R N IN G
F O R C O N T IN U E D F IR E
P R O T E C T IO N R E P L A C E
O N L Y W IT H S P E C IF IE D
T Y P E A N D R A T E D F U S E
1 1 0
T 2 .5 A
2 2 0 V
T 5 A
1 1 0 V
2 2 0
> 1 8 k g
1 1
~ IN P U T
9 0
1 8 0
4 8
4 0
H E A V Y W E IG H T
W A R N IN G
D O N O T O P E R A T E
W IT H P O W E R C O R D
U N G R O U N D E D
2 2 0 V
2 .5 A
1 1 0 V
5 A
!
L IN E
S E L E C T
W A R N IN G
D O N O T O P E R A T E
W IT H P O W E R C O R D
U N G R O U N D E D
~ IN P U T
9 0 - 1 3 2 V A C
1 8 0 - 2 6 4 V A C
4 8 - 4 4 0 H z
4 0 0 V A m a x
!
W A R N IN G
N O O P E R A T O R S E R V IC E A B L E P A R T S IN S ID E .
R E F E R S E R V IC IN G T O
Q U A L IF IE D P E R S O N N E L
Figure A-1.
A-2
Rear Panel, Series 681XXC Synthesized Signal Generator (1 of 2)
681XXC OM
REAR PANEL
CONNECTORS
1
AUX I/O: 25-pin connector that provides for single cable interface with another 68XXXB/C (master-slave
operation) and with other Anritsu instruments such as the Anritsu 56100A Scalar Network Analyzer. A
pinout diagram for this connector is shown in Figure A-2.
2
HORIZ OUT: Provides a 0V to 10V ramp during all sweep modes, regardless of sweep width. In the CW
mode, provides a voltage between 0V and 10V proportional to the full frequency range of the instrument.
When the CW Ramp is enabled, connector provides a repetitive 0V to 10V ramp. BNC connector, 50W
impedance.
3
10 MHz REF IN: Accepts an external 10 MHz ±100 Hz, 0 to 10 dBm time-base signal. Automatically
disconnects the internal high-stability, time-base option, if installed. BNC connector, 50W impedance.
4
10 MHz REF OUT: Provides a 0.5 Vp-p, AC coupled, 10 MHz signal derived from the internal frequency
standard of the signal generator. BNC connector, 50W impedance.
5
AM IN: Accepts an external modulating signal to produce AM on the RF output. AM sensitivity (linear or
log) and input impedance (50W or 600W) are selectable via front panel menu or GPIB. BNC connector.
6
FM IN: Accepts an external modulating signal to produce FM on the RF output. FM sensitivity and input
impedance (50W or 600W) are selectable via front panel menu or GPIB. BNC connector.
7
IN: Accepts an external TTL level signal to square wave (pulse) modulate the RF output. BNC
connector.
8
EXT ALC IN: Provides for leveling the RF output signal externally with either a remote detector or a
power meter. Connector accepts a positive or negative 0.5—500 mV signal from a remote detector or a
±1V signal from a remote power meter. BNC connector.
9
Line Fuse: Provides over-voltage/current protection for signal generator circuits during operation and
standby. Unit requires a 5A, type T fuse for 110 Vac line voltage or a 2.5A, type T fuse for 220 Vac line
voltage.
10 LINE SELECT Switch: Provides selection of 110 or 220 Vac line voltages. When 110 Vac is selected, the
681XXC accepts 90-132 Vac, 48-440 Hz line voltage; when 220 Vac is selected, the 681XXC accepts
180-264 Vac, 48-440 Hz line voltage.
11 Input Line Voltage Receptacle: Provides for connecting line voltage to the 681XXC signal generator.
12 IEEE-488 GPIB: 24-pin connector that provides for remotely controlling the signal generator from an
external controller via the IEEE-488 bus (GPIB). A pinout diagram for this connector is shown in Figure
A-3.
13 SERIAL I/O: Provides access to two RS-232 terminal ports to support service and calibration functions
and master-slave operations. RJ45 connector.
Figure A-1.
Rear Panel, Series 681XXC Synthesized Signal Generator (2 of 2)
681XXC OM
A-3
REAR PANEL
CONNECTORS
CONNECTOR
PINOUT DIAGRAMS
AUX I/O
25
24
23
22
21
20
19
18
17
16
15
14
PIN
1
HORIZ OUTPUT
2
GND
3
SEQ SYNC
4
L ALT ENABLE
5
MARKER OUTPUT
6
RETRACE BLANKING
7
L ALT SWP
8
Shield
9
TRIGGER OUTPUT
10
SWP DWELL OUT
11
LOCK STATUS
12
RXb
13
EXT TRIGGER
Figure A-2.
A-4
SIGNAL NAME
13
12
11
10
9
8
7
6
5
4
3
2
1
SIGNAL DESCRIPTION
Horizontal Sweep Output: Provides a 0V at beginning and +10V at end of sweep
for all sweep modes, regardless of sweep width. In the CW mode, the voltage is
proportional to frequency between 0V at low end and +10V at the high end of
range. In CW mode, if CW Ramp is enabled, a repetitive, 0V to +10V ramp is provided. The ramp speed is adjusted by the Sweep Time function.
Chassis Ground
Sequential Sync Output: Provides a +5V signal during sweep retrace, at bandswitching points, and during each frequency step in step sweep mode, –5V during
markers, and –10V during the selected marker.
L-Alternate Enable Output: Provides a TTL low-level signal which indicates that
the alternate sweep mode is active.
Marker Output: Provides a +5V or –5V signal during a marker. Signal polarity selected from a front panel menu.
Retrace Blanking Output: Provides a +5V or –5V signal coincident with sweep retrace. Signal polarity selected from a front panel menu.
L-Alternate Sweep Output: Provides a TTL low-level signal to indicate that the
primary sweep is in progress or a TTL high-level signal to indicate that the alternate sweep is in progress.
Cable Shield/Chassis Ground
Trigger Output: Provides a TTL low-level trigger signal for external devices or instruments.
Sweep Dwell Output: Provides an open-collector output which goes to ground
when the sweep is dwelled at the start, stop, and bandswitching frequencies, and
at the markers.
Lock Status Output: Provides a TTL high-level signal when the frequency is
phase-locked.
RXb: Serial Data Input to the processor (/t1).
External Trigger: Accepts a TTL low-level signal of 1 ms width to trigger a sweep.
Pinout Diagram, AUX I/O Connector (1 of 2)
681XXC OM
REAR PANEL
CONNECTORS
CONNECTOR
PINOUT DIAGRAMS
PIN
SIGNAL NAME
14
V/GHz
15
EOS INPUT
16
EOS OUTPUT
17
AUX 1
18
SWP DWELL IN
19
AUX 2
20
BANDSWITCH BLANK
21
SPARE
22
HORIZ IN
23
Return
24
TXb
25
MEMORY SEQ
Figure A-2.
SIGNAL DESCRIPTION
V/GHz Output: Provides a reference voltage relative to the RF output frequency
(1.0 V/GHz for Models 68117C, 68137C, and 68147C; 0.5 V/GHz for Model
68167C; 0.25V/GHz for Models 68177C, 68187C, and 68197C).
End-of-Sweep Input: Accepts a TTL high-level signal to tell the signal generator
to begin the end of sweep dwell.
End-of-Sweep Output: Provides a TTL high-level signal when the signal generator has begun the end of sweep dwell.
Aux 1: Auxiliary input/output to the processor (PB6).
Sweep Dwell Input: Permits a TTL low-level signal to stop the sweep in both analog- and step-sweep modes. The sweep resumes when the signal is removed.
Aux 2: Auxiliary input/output to the processor (PC3).
Bandswitch Blanking Output: Provides a +5V or –5V signal coincident with bandswitching points. Signal polarity is selected from a front panel menu.
Horizontal Sweep Input: Accepts a 0V to 10V external sweep ramp from a Master
signal generator. This input is automatically selected when the signal generator is
in the Slave Mode.
Horizontal Sweep Input return.
TXb: Serial Data Output from the processor.
Memory Sequencing Input: Accepts a TTL low-level signal to sequence through
nine stored, front panel setups.
Pinout Diagram, AUX I/O Connector (2 of 2)
681XXC OM
A-5
REAR PANEL
CONNECTORS
CONNECTOR
PINOUT DIAGRAMS
IEEE-488 GPIB
13 14 15 16 17 18 19 20 21 22 23 24
1
2
3
4
5
6
7
8
9 10 11 12
PIN
SIGNAL NAME
SIGNAL DESCRIPTION
1-4
DIO 1 thru DIO 4
5
EOI
6
DAV
7
NRFD
8
NDAC
9
IFC
10
SRQ
11
ATN
12
Shield
Data Input/Output: Bits are HIGH when the data is logical 0 and LOW when the
data is logical 1.
End or Identify: A low-true state indicates that the last byte of a multibyte message has been placed on the line.
Data Valid: A low-true state indicates that the active talker has (1) sensed that
NRFD is high-false and NDAC is low-true, (2) placed the data byte on the bus,
and (3) waited an appropriate length of time for the data to settle.
Not Ready For Data: A high-false state indicates that all active listeners are ready
to accept new data.
Not Data Accepted: A low-true state indicates that all addressed listeners have
accepted the current data byte for internal processing.
Interface Clear: A low-true state places all bus instruments in a known, quiescent
state—unaddressed to talk, unaddressed to listen, and service request idle.
Service Request: A low-true state indicates that a bus instrument desires the immediate attention of the controller.
Attention: A low-true state indicates that the bus is in the command mode (data
lines are carrying bus commands). A high-false state indicates that the bus is in
the data mode (data lines are carrying device-dependent instructions or data).
Chassis Ground
13-16
DIO5 thru DIO6
17
REN
18-24
GND
Figure A-3.
A-6
Data Input/Output: Bits are HIGH when the data is logical 0 and LOW when the
data is logical 1.
Remote Enable: A low-true state enables bus instruments to be operated remotely, when addressed.
Logic Ground
Pinout Diagram, IEEE-488 GPIB Connector
681XXC OM
Appendix B
Performance Specifications
MODEL SUMMARY
Model
Frequency Range
68117C
0.01 to 8.4 GHz
68137C
2.0 to 20.0 GHz
68147C
0.01 to 20.0 GHz
68167C
0.01 to 40.0 GHz
68177C
0.01 to 50.0 GHz
68187C
0.01 to 60.0 GHz
68197C
0.01 to 65.0 GHz
FREQUENCY
CW MODE
Output: Twenty independent, presettable CW frequencies
(F0 – F9 and M0 – M9).
Accuracy: Same as internal or external 10 MHz time base.
Internal Time Base Stability:
With Aging: <2 x 10-8/day
(<5 x 10–10/day with Option 16)
With Temperature: <2 x 10-8/°C over 0°C to 55°C
(<2 x 10-10/°C with Option 16)
Resolution:
1 kHz (0.1 Hz with Option 11)
External 10 MHz Reference Input: Accepts external
10 MHz 100 Hz, –10 to +20 dBm time base signal.
Automatically disconnects the internal high-stability
time-base option, if installed. BNC, rear panel, 50W
impedance.
10 MHz Reference Output: 0.5 Vp-p into 50W,AC
coupled. Rear panel BNC; 50W impedance.
Switching Time (typical maximum):
Units having a high-end frequency of ³20 GHz:
<40 ms to be within 1 kHz of final frequency.
Units having a high-end frequency of 8.4 GHz:
<15 ms to be within 1 kHz of final frequency.
681XXC OM
ANALOG SWEEP MODE
Sweep Width: Independently selected from 1 MHz to full
range continuous sweep.
Accuracy: The lesser of:
±30 MHz or (±2 MHz + 0.25% of sweep width) for sweep
speeds of £50 MHz/ms.
Sweep Time Range: 30 ms to 99 seconds
PHASE-LOCKED STEP SWEEP MODE
Sweep Width: Independently selected, 1 kHz (0.1 Hz with
Option 11) to full range. Every frequency step in sweep
range is phase-locked.
Accuracy: Same as internal or external 10 MHz time base.
Resolution (Minimum Step Size):
1 kHz (0.1 Hz with Option 11)
Linear/Log Sweep: User-selectable linear or log sweep.
In log sweep, step size logarithmically increases with frequency.
Steps: User-selectable number of steps or the step size.
Number of Steps: Variable from 1 to 10,000
Step Size: 1 kHz (0.1 Hz with Option 11) to the full frequency range of the instrument. (If the step size does not
divide into the selected frequency range, the last step is
truncated.)
Dwell Time Per Step: Variable from 1 ms to 99 seconds
Fixed Rate Sweep: Allows the user to set the total time of
the sweep, including lock time. Variable from 20 ms to 99
seconds.
Switching Time (typical maximum):
Units having a high-end frequency of ³20 GHz:
<15 ms + 1 ms/GHz step size or <40 ms, whichever is
less, to be within 1 kHz of final frequency.
Units having a high-end frequency of 8.4 GHz:
<7 ms to be within 1 kHz of final frequency.
ALTERNATE SWEEP MODE
Sweeps alternately in analog or step sweep between any
two sweep ranges. Each sweep range may be associated
with a different power level.
MANUAL SWEEP MODE
Provides stepped, phase-locked adjustment of frequency
between sweep limits. User-selectable number of steps or
step size.
B-1
PERFORMANCE
SPECIFICATIONS
360B VNA SOURCE LOCK MODE
Under control of the Anritsu 360B Vector Network Analyzer, the synthesized signal generator is phase-locked at a
typical <8.5 ms/step sweep speed. Frequency resolution is
limited to 100 kHz.
Minimum specified frequency is 2.1 GHz for model
68137C.
LIST SWEEP MODE
Under GPIB control or via the front panel, up to 4 tables
with 2000 non-sequential frequency/power sets can be
stored and the addressed as a phase-locked step sweep.
One table of 2000 points is stored in non-volatile memory,
all other tables are stored in volatile memory.
Switching Time (typical maximum):
Units having a high-end frequency of ³20 GHz:
<25 ms to be within 1 kHz of final frequency.
Units having a high-end frequency of 8.4 GHz:
<5 ms to be within 1 kHz of final frequency.
PROGRAMMABLE FREQUENCY AGILITY
Under GPIB control, up to 3202 non-sequential frequency/
power sets can be stored and then addressed as a
phase-locked step sweep. Data stored in volatile memory.
Switching Time (typical maximum):
Units having a high-end frequency of ³20 GHz:
<25 ms to be within 1 kHz of final frequency.
Units having a high-end frequency of 8.4 GHz:
<5 ms to be within 1 kHz of final frequency.
MARKERS
Up to 20 independent, settable markers (F0 – F9 and
M0 – M9).
Video Markers: +5V or –5V marker output, selectable
from system menus. AUX I/O connector, rear panel.
Intensity Markers (Available in Analog Sweeps of
<1 Second Sweep Time): Produces an intensified dot on
trace, obtained by momentary dwell in RF sweep.
Marker Accuracy: Same as sweep frequency accuracy.
Marker Resolution (Analog Sweep):
1 MHz or Sweep Width/4096, whichever is greater.
Marker Resolution (Step Sweep):
1 kHz (0.1 Hz with Option 11)
SPECTRAL PURITY
All specifications apply to the phase-locked CW and Step
Sweep modes at the lesser of +10 dBm output or maximum specified leveled output power, unless otherwise
noted.
SPURIOUS SIGNALS
Harmonic and Harmonic Related:
0.1 Hz to 10 MHz (Option 22):
<–30 dBc
10 MHz to £50 MHz:
<–30 dBc
>50 MHz to £2 GHz:
<–40 dBc
>2 GHz to £20 GHz:
<–60 dBc
>20 GHz to £40 GHz:
<–40 dBc
Harmonic and Harmonic Related (Models having a
high-end frequency of >40 GHz and units with Option
15A at maximum specified leveled output power):
10 MHz to £50 MHz:
<–30 dBc
>50 MHz to £2 GHz:
<–40 dBc
>2 GHz to £20 GHz:
<–50 dBc
>20 GHz to £40 GHz:
<–40 dBc
50 GHz units:
>40 GHz to £50 GHz:
<–40 dBc
60 GHz units:
>40 GHz to £60 GHz:
<–30 dBc
65 GHz units:
>40 GHz to £65 GHz:
<–25 dBc
Nonharmonics:
0.1 Hz to 10 MHz (Option 22):
<–30 dBc
10 MHz to £2 GHz:
<–40 dBc
>2 GHz to £65 GHz:
<–60 dBc
SWEEP TRIGGERING
Sweep triggering is provided for Analog Frequency Sweep,
Step Frequency Sweep, List Frequency Sweep, and CW
Power Sweep.
Auto: Triggers sweep automatically.
External: Triggers a sweep on the low to high transition of
an external TTL signal. AUX I/O connector, rear panel.
Single: Triggers, aborts, and resets a single sweep. Reset
sweep may be selected to be at the top or bottom of the
sweep. The pen lift will activate at sweep times ³1 second.
B-2
681XXC OM
PERFORMANCE
SPECIFICATIONS
SINGLE-SIDEBAND PHASE NOISE (dBc/Hz)
Offset From Carrier
Frequency Range
100 Hz
1 kHz
10 kHz
100 kHz
0.1 Hz to <10 MHz
(w/Option 22)
–90
–120
–130
–130
³10 MHz to £2.0 GHz
–77
–88
–86
–100
>2.0 GHz to £6.0 GHz
–78
–88
–86
–102
>6.0 GHz to £10.0 GHz
–73
–86
–83
–102
>10.0 GHz to £20.0 GHz
–66
–78
–78
–100
>20.0 GHz to £40.0 GHz
–60
–75
–72
–94
>40.0 GHz to £65.0 GHz
–54
–69
–64
–88
POWER LINE and FAN ROTATION SPURIOUS EMISSIONS (dBc)
Offset From Carrier
Frequency Range
10 MHz to £8.4 GHz
<300 Hz
300Hz to 1 kHz
>1 kHz
<–50
<–60
<–60
>8.4 GHz to £20 GHz
<–46
<–56
<–60
>20 GHz to £40 GHz
<–40
<–50
<–54
>40 GHz to £65 GHz
<–34
<–44
<–48
RESIDUAL FM (CW and Step Sweep modes, 50 Hz - 15 kHz BW)
Frequency Range
Residual FM (Hz RMS)
10 MHz to £8.4 GHz
<120
>8.4 GHz to £20 GHz
<220
>20 GHz to £40 GHz
<440
>40 GHz to £65 GHz
<880
RESIDUAL FM (Analog Sweep and Unlocked FM modes, 50 Hz - 15 kHz BW)
Frequency Range
Unlocked Narrow FM Mode
(kHz RMS)
Unlocked Wide FM Mode
(kHz RMS)
10 MHz to £20 GHz
<5
<25
>20 GHz to £40 GHz
<10
<50
>40 GHz to £65 GHz
<20
<100
AM Noise Floor: Typically <–145 dBm/Hz at 0 dBm output and offsets >5 MHz from carrier.
681XXC OM
B-3
PERFORMANCE
SPECIFICATIONS
RF OUTPUT
Power level specifications apply at 25° ±10°C.
MAXIMUM LEVELED OUTPUT POWER
Model
Number
Frequency
Range
(GHz)
Output
Power
(dBm)
Output Power with
Step Attenuator
(dBm)
Output Power with
Electronic Step
Attenuator (dBm)
w/Option 22
0.1 Hz to 10 MHz
+13.0
+11.0
+9.0
68117C
0.01 to £8.4
+13.0
+11.0
+9.0
68137C
2.0 to £20.0
+13.0
+11.0
+3.0
68147C
0.01 to £20.0
+13.0
+11.0
+3.0
68167C
0.01 to £2.0
>2.0 to £20.0
>20.0 to £40.0
+13.0
+9.0
+6.0
+11.0
+7.0
+3.0
Not
Available
68177C
0.01 to £2.0
>2.0 to £20.0
>20.0 to £40.0
>40.0 to £50.0
+12.0
+10.0
+2.5
+2.5
+10.0
+8.5
0.0
–1.0
Not
Available
68187C
0.01 to £2.0
>2.0 to £20.0
>20.0 to £40.0
>40.0 to £50.0
>50.0 to £60.0
+12.0
+10.0
+2.5
+2.0
+2.0
+10.0
+8.5
0.0
–1.5
–2.0
Not
Available
68197C
0.01 to £2.0
>2.0 to £20.0
>20.0 to £40.0
>40.0 to £50.0
>50.0 to £65.0
+12.0
+10.0
+2.5
0.0
–2.0
Not
Available
Not
Available
With Option 15A (High Power) Installed
68117C
0.01 to £2.0
>2.0 to £8.4
+13.0
+17.0
+11.0
+15.0
+11.0
+11.0
68137C
2.0 to £20.0
+17.0
+15.0
+7.0
68147C
0.01 to £2.0
>2.0 to £20.0
+13.0
+17.0
+11.0
+15.0
+11.0
+7.0
68167C
0.01 to £20.0
>20.0 to £40.0
+13.0
+6.0
+11.0
+3.0
Not
Available
Note: In models with Option 22 that have a high-end frequency of £20 GHz, rated output power is reduced by 1 dB
In models with Option 22 that have a high-end frequency of >20 GHz, rated output power is reduced by 2 dB.
B-4
681XXC OM
PERFORMANCE
SPECIFICATIONS
LEVELED OUTPUT POWER RANGE
Standard Units
Without an Attenuator: Maximum leveled power to
–15 dBm (–20 dBm typical).
With an Attenuator: Maximum leveled power to
–120 dBm.
With an Electronic Attenuator: Maximum leveled
power to–140 dBm.
Units with Option 15A, High Power
Without an Attenuator: Maximum leveled power to
–5 dBm (–10 dBm typical).
With an Attenuator: Maximum leveled power to
–115 dBm (–120 dBm typical). For units with a high frequency limit >40 GHz and units with Option 15A, minimum settable power is –105 dBm (–110 dBm typical).
With an Electronic Attenuator: Maximum leveled
power to –115 dBm (–110 dBm typical).
UNLEVELED OUTPUT POWER RANGE (typical)
Without an Attenuator: >40 dB below max power.
With an Attenuator: >130 dB below max power.
POWER LEVEL SWITCHING TIME (to within specified
accuracy):
Without Change in Step Attenuator: <3 ms typical
With Change in Step Attenuator: <20 ms typical
With Change in Electronic Step Attenuator: < 3 m s
typical. Power level changes across –70 dB step will result in 20 ms delay.
ACCURACY AND FLATNESS
Accuracy specifies the total worst case accuracy. Flatness
is included with the accuracy specification.
Step Sweep and CW Modes
Attenuation
Below
Max Power 0.01-20
Accuracy:
0-25 dBÁ
±1.0 dB
25-60 dB
±1.0 dB
>60 dB
±1.0 dB
20-40
±1.0 dB
Frequency
(GHz)
40-50
50-60
±1.5 dB
±1.5 dB
±1.0 dB ±1.5 dB ±3.5 dBÀ
±1.0 dB ±2.5 dBÀ ±3.5 dBÀ
±1.5 dB
±1.1 dB
Flatness:
0-25 dBÁ
±0.8 dB
±0.8 dB
25-60 dB
±0.8 dB
>60 dB
±0.8 dB
±1.1 dB ±3.1 dBÀ
±0.8 dB ±2.1 dBÀ ±3.1 dBÀ
±1.1 dB
±1.1 dB
±0.8 dB
À Typical
Á 0 to 25 dB or to minimum rated power, whichever is higher
681XXC OM
60-65
N/A
N/A
N/A
N/A
Analog Sweep Mode (typical)
Attenuation
Below
Max Power
0.01-0.05
Frequency
(GHz)
0.05-20
20-40
40-65
Accuracy
0-12 dB
±2.0 dB
±1.0 dB
±2.0 dB
±3.0 dB
0-30 dB
±3.5 dB
±3.5 dB
±4.6 dB
±5.6 dB
30-60 dB
±4.0 dB
±4.0 dB
±5.2 dB
±6.2 dB
60-122 dB
±5.0 dB
±5.0 dB
±6.2 dB
±7.2 dB
Flatness
0-12 dB
±2.0 dB
±1.0 dB
±2.0 dB
±2.5 dB
0-30 dB
±3.5 dB
±3.0 dB
±4.1 dB
± 5.1 dB
30-60 dB
±3.5 dB
±3.5 dB
±4.6 dB
±5.6 dB
60-122 dB
±4.0 dB
±4.0 dB
±5.2 dB
±6.2 dB
OTHER OUTPUT POWER SPECIFICATIONS
Output Units: Output units selectable as either dBm or
mV. Selection of mV assumes 50W load. All data entry and
display are in the selected units.
Output Power Resolution: 0.01 dB or 0.001 mV
Source Impedance: 50W nomimal
Source SWR (Internal Leveling): <2.0 typical
Power Level Stability with Temperature:
0.04 dB/°C typical
Level Offset: Offsets the displayed power level to establish a new reference level.
Output On/Off: Toggles the RF output between an Off and
On state. During the Off state, the RF oscillator is turned off.
The On or Off state is indicated by two LEDs located below
the OUTPUT ON/OFF key on the front panel.
RF On/Off Between Frequency Steps: System menu selection of RF On or RF Off during frequency switching in
CW, Step Sweep, and List Sweep modes.
RF On/Off During Retrace: System menu selection of RF
On or RF Off during retrace.
Internal Leveling: Power is leveled at the output connector in all modes.
External Leveling:
External Detector: Levels output power at a remote
detector location. Accepts a positive or negative 0.5 mV to
500 mV input signal from the remote detector. EXT ALC
ADJ adjusts the input signal range to an optimum value.
BNC connector, front and rear panel.
External Power Meter: Levels output power at a remote power meter location. Accepts a ±1V full scale input
signal from the remote power meter. EXT ALC ADJ adjusts the input signal range to an optimum value. BNC
connector, front and rear panel.
External Leveling Bandwidth:
30 kHz typical in Detector mode.
0.7 Hz typical in Power Meter mode.
B-5
PERFORMANCE
SPECIFICATIONS
User Level Flatness Correction:
Number of points: 2 to 801 points per table
Number of tables: 5 available
Entry modes: GPIB power meter or computed data
CW POWER SWEEP
Range: Sweeps between any two power levels at a single
CW frequency.
Resolution: 0.01 dB/step (Log) or 0.001 mV (Linear)
Accuracy: Same as CW power accuracy.
Log/Linear Sweep: Power sweep selectable as either log
or linear. Log sweep is in dB; linear sweep is in mV.
Step Size: User-controlled, 0.01 dB (Log) or 0.001 mV
(Linear) to the full power range of the instrument.
Step Dwell Time: Variable from 1 ms to 99 seconds. If the
sweep crosses a step attenuator setting, there will be a
sweep dwell of approximately 20 ms to allow setting of the
step attenuator.
SWEEP FREQUENCY/STEP POWER
A power level step occurs after each frequency sweep.
Power level remains constant for the length of time required to complete each sweep.
MODULATION
AMPLITUDE MODULATION
All amplitude modulation specifications apply at 50%
depth, 1 kHz rate, with RF level set 6 dB below maximum
specified leveled output power, unless otherwise noted.
External AM Input: Log AM or Linear AM input, front or
rear-panel BNC, 50W or 600W input impedance. All options
selectable from modulation menu.
AM Sensitivity:
Log AM: Continuously variable from 0 dB/volt to
25 dB/volt
Linear AM: Continuously variable from 0% per volt to
100% per volt
AM Depth (typical): 0-90% linear; 20 dB log
AM Bandwidth (3 dB): DC to 50 kHz minimum
DC to 100 kHz typical
Flatness (DC to 10 kHz rates): ±0.3 dB
Accuracy: ±5%
Distortion: <5% typical
Incidential Phase Modulation
(30% depth, 10 kHz rate): <0.2 radians
Maximum Input: ±1V
B-6
FREQUENCY MODULATION
External FM Input: Front or rear panel BNC, 50W or 600W
input impedance. All options selectable from modulation
menu.
FM Sensitivity: Continuously variable from ±10 kHz per
volt to ±20 MHz per volt (Locked or Unlocked Narrow FM
modes) or ±100 kHz per volt to ±100 MHz per volt (Unlocked Wide FM mode), selectable from modulation menu.
Maximum FM Deviation:
Locked Mode (1 kHz to 500 kHz rates):
The lesser of ±10 MHz or rate x 300
Unlocked Narrow Mode (DC to 500 kHz rates):
±10 MHz
Unlocked Wide Mode (DC to 100 Hz rates):
±100 MHz
FM Bandwidth (3 dB):
Locked Mode: 1 kHz to 500 kHz
Unlocked Narrow Mode: DC to 500 kHz
Unlocked Wide Mode: DC to 100 Hz
Flatness (10 kHz to 500 kHz rates): ±1 dB
Accuracy (100 kHz rate, ±1V input): 10% (5% typical)
Maximum Input: ±1V
SQUARE WAVE MODULATION
The RF output can be pulse modulated via an external
modulating signal or an internal square wave generator.
On/Off Ratio: >50 dB
Rise/Fall Time: <1 ms typical
Internal Square Wave Generator: Four square wave signals (400 Hz, 1 kHz, 7.8125 kHz, and 27.8 kHz), selectable
from modulation menu.
Accuracy: Same as internal or external 10 MHz time
base.
Square Wave Symmetry: 50% ±5% at all power levels
External Input: Front or rear-panel BNC, selectable from
modulation menu.
Drive Level: TTL compatible input
Minimum Pulse Width: >5 ms.
Input Logic: Positive-true or negative-true, selectable
from modulation menu.
681XXC OM
PERFORMANCE
SPECIFICATIONS
REMOTE OPERATION
GENERAL
All instrument functions, settings, and operating modes
(except for power on/standby) are controllable using commands sent from an external computer via the GPIB
(IEEE-488 interface bus).
GPIB Address: Selectable from a system menu
IEEE-488 Interface Function Subset:
Source Handshake: SH1
Acceptor Handshake: AH1
Talker: T6
Listener: L4
Service Request: SR1
Remote/Local: RL1
Parallel Poll: PP1
Device Clear: DC1
Device Trigger: DT1
Controller Capability: C0, C1, C2, C3, C28
Tri-State Driver: E2
GPIB Status Annunciators: When the instrument is operating in Remote, the GPIB status annunciators (listed below) will appear in a window on the front panel LCD.
REMOTE: Operating on the GPIB (all instrument front
panel keys except for the SYSTEM key and the RETURN
TO LOCAL soft-key will be ignored).
LLO (LOCAL LOCKOUT): Disables the RETURN TO
LOCAL soft-key. Instrument can be placed in local mode
only via GPIB.
Emulations: The instrument responds to the published
GPIB commands and responses of the Anritsu Models
6600, 6700, and 6XX00-series signal sources. When emulating another signal source, the instrument will be limited to
the capabilities, mnemonics, and parameter resolutions of
the emulated instrument.
Stored Setups: Stores front panel settings and nine additional front-panel setups in a non-volatile RAM. A system
menu allows saving and recalling of instrument setups.
Whenever the instrument is turned on, control settings
come on at the same functions and values existing when
the instrument was turned off.
Memory Sequencing Input: Accepts a TTL low-level signal to sequence through nine stored setups. AUX I/O connector, rear panel.
Self-Test: Instrument self-test is performed when Selftest
soft-key is selected. If an error is detected, an error message is displayed in a window on the LCD identifying the
probable cause and remedy.
Secure Mode: Disables all frequency, power level, and
modulation state displays. Stored setups saved in secure
mode remain secured when recalled. Mode selectable from
a system menu and via GPIB.
Parameter Entry: Instrument-controlled parameters can
be entered in three ways—keypad, rotary data knob, or the
Ù and Ú touch pads of the cursor-control key.
The keypad is used to enter new parameter values; the
rotary data knob and the cursor-control key are used to
edit existing parameter values. The < and > touch pads of
the cursor-control key move the cursor left and right one
digit under the open parameter. The rotary data knob or
the Ù and Ú touch pads will increment or decrement the
digit position over the cursor.
Keypad entries are terminated by pressing the appropriate unit key (GHz/Sec/dBm, MHz/ms/dB, kHz/ms/STEPS,
or Hz/ns/ADRS). Edits are terminated by exiting the edit
menu.
Reset: Returns all instrument parameters to predefined default states or values. Any pending GPIB I/O is aborted. Selectable from the system menu.
Master/Slave Operation: Allows two output signals
(68XXXB/C) to be swept with a user-selected frequency offset. One instrument controls the other via AUX I/O and SERIAL I/O connections. Requires a Master/Slave Interface
Cable Set (Part No. ND36329).
User Level Flatness Correction: Allows user to calibrate
out path loss due to external switching and cables via entered power table from a GPIB power meter or calculated
data. When user level correction is activated, entered power
levels are delivered at the point where calibration was performed. Supported power meters are Anritsu ML2437A,
ML2438A, and ML4803A and HP 437B, 438A, and 70100A.
Five user tables are available with up to 801 points/table.
681XXC OM
B-7
PERFORMANCE
SPECIFICATIONS
Warm Up Time:
From Standby: 30 minutes.
From Cold Start (0°C): 120 hours to achieve specified
frequency stabiltiy with aging.
Instruments disconnected from ac line power for more
than 72 hours require 30 days to return to specified frequency stability withaging.
Power:
90-132 Vac or 180-264 Vac, 48–440 Hz, 400 VA maximum
Standby: With ac line power connected, unit is placed in
standby when front panel power switch is released from the
OPERATE position.
Weight: 23 kg maximum
Dimensions:
133 H x 429 W x 597 D mm
RF Output Connector:
Type K female, £40 GHz models
Type V female, >40 GHz models.
ENVIRONMENTAL
Storage Temperature Range: –40°C to +75°C.
Operating Temperature Range: 0°C to +50°C.
Relative Humidity: 5% to 95% at 40°C.
Altitude: 4,600 meters.
EMI
Meets the radiated emission requirements of:
EN55011:1991/CISPR-11:1990 Group 1 Class A
EN50082-1:1997/
EN 61000-4-2:1995 - 4 kV CD, 8 kV AD
EN 61000-4-3:1997 - 3 V/m
ENV 50204 - 3 V/m
EN 61000-4-4:1995 - 0.5 kV SL, 1 kV PL
EN 61000-4-5:1995 - 1 kV L-L, 2 kV L-E
MIL-STD-461C Part 2 RE01, RE02, CE01, CE03,
CS01, CS02, CS06, RS03
B-8
INPUTS and OUTPUTS
Input/Output Connectors
Nomenclature
Type
Location
AM IN
BNC
Front & Rear Panel
FM IN
BNC
Front & Rear Panel
BNC
Front & Rear Panel
BNC
Front & Rear Panel
IN
EXT ALC IN
RF OUTPUT
K-Connector Standard-Front Panel
V-Connector Option 9-Rear Panel
10 MHz REF IN
BNC
Rear Panel
10 MHz REF OUT
BNC
Rear Panel
HORIZ OUT
BNC
Rear Panel
AUX I/O
25-pin D-type
Rear Panel
SERIAL I/O
RJ45
Rear Panel
IEEE-488 GPIB
Type 57
Rear Panel
AM IN : Accepts an external signal to AM modulate the RF
output signal. Front or rear-panel input, 50W or 600W
impedance, both selectable from front-panel modulation
menu.
FM IN : Accepts an external signal to FM modulate the RF
output signal. Front or rear-panel input, 50W or 600W
impedance, both selectable from front-panel modulation
menu.
IN : Accepts an external TTL compatible signal to
pulse modulate the RF output signal. Front or rear-panel input, selectable from front-panel modulation menu.
EXT ALC IN (External ALC Input): Provides for leveling
the RF output signal externally with either a detector or
power meter. Signal requirements are shown in the RF Output specifications on page B-5.
RF OUTPUT: Provides for RF output from 50W source
impedance. K or V Connector, female. Option 9 moves the
RF Output connector to the rear panel.
10 MHz REF IN: Accepts an external 10 MHz ±100 Hz,
0 to +10 dBm time-base signal. Automatically disconnects
the internal high-stability time-base option, if installed. 50W
impedance.
10 MHz REF OUT: Provides a 0.5 Vp-p, AC coupled,
10 MHz signal derived from the internal frequency standard.
50W impedance.
HORIZ OUT (Horizontal Sweep Output): Provides 0V at
beginning and +10V at end of sweep for all sweep modes,
regardless of sweep width. In CW mode, the voltage is proportional to frequency between 0V at low end and +10V at
the high end of range. In CW mode, if CW RAMP is enabled, a repetitive, 0V to +10V ramp is provided.
681XXC OM
PERFORMANCE
SPECIFICATIONS
AUX I/O (Auxiliary Input/Output): Provides for most of
the rear panel BNC connections through a single, 25-pin,
D-type connector. Supports master-slave operation with another 68XXXB/C synthesizer and allows for a single-cable
interface with the Model 56100A Scalar Network Analyzer
and other Anritsu instruments. For a pinout diagram and descriptions, see Appendix A, Figure A-2.
SERIAL I/O (Serial Input/Output): Provides access to
RS-232 terminal ports to support service and calibration
functions, and master-slave operations.
IEEE-488 GPIB: Provides input/output connections for the
General Purpose Interface Bus (GPIB). For a pinout diagram, see Appendix A, Figure A-3.
681XXC OM
OPTIONS
Option 1, Rack Mounting: Rack mount kit containing a
set of track slides (90° tilt capability), mounting ears, and
front panel handles to let the instrument be mounted in a
standard 19-inch equipment rack.
Option 2A, 110 dB Step Attenuator: Adds a 10 dB/step
attenuator with 110 dB range for models having a high-end
frequency of £20 GHz. Rated RF output power is reduced.
Option 2B, 110 dB Step Attenuator: Adds a 10 dB/step
attenuator with 110 dB range for models having a high-end
frequency of £40 GHz. Rated RF output power is reduced.
Option 2C, 90 dB Step Attenuator: Adds a 10 dB/step
attenuator with 90 dB range for models having a high-end
frequency of £50 GHz. Rated RF output power is reduced.
Option 2D, 90 dB Step Attenuator: Adds a 10 dB/step
attenuator with 90 dB range for models having a high-end
frequency of £60 GHz. Rated RF output power is reduced.
Option 2E, 120 dB Electronic Step Attenuator: Adds a
10 dB/step electronic attenuator with a 120 dB range for
models having a high-end frequency of £8.4 GHz. Rated RF
output power is reduced.
Option 2F, 120 dB Electronic Step Attenuator: Adds a
10 dB/step electronic attenuator with a 120 dB range for
models having a high-end frequency of £20 GHz. Rated RF
output power is reduced.
Option 9, Rear Panel RF Output: Moves the RF output
connector to the rear panel.
Option 11, 0.1 Hz Frequency Resolution: Provides frequency resolution of 0.1 Hz.
Option 14, Rack Mounting without Chassis Slides:
Modifies rack mounting hardware to install unit in a console
that has mounting shelves. Includes mounting ears and
front panel handles.
Option 15A, High Power Output: Adds high-power RF
components to the instrument in the 2-20 GHz frequency
range. Option 15A is standard in models having a high-end
frequency that is >40 GHz.
Option 16, High-Stability Time Base: Adds an ovenized,
10 MHz crystal oscillator as a high-stability time base.
Option 17A, Delete Front Panel: Deletes the front panel
for use in remote control applications where a front panel
display and keyboard control are not needed.
Option 18, mmWave Module Bias Output: Provides bias
output for 54000-xWRxx Millimeter Wave Source Modules.
BNC Twinax connectors, rear panel.
Option 19, SCPI Programmability: Adds GPIB command
mnemonics complying with Standard Commands for Programmable Instruments (SCPI), Version 1993.0 SCPI programming complies with IEEE 488.2-1987.
Option 22, 0.1 Hz to 10 MHz Audio Frequency: Adds
frequency coverage below 10 MHz. In models having a
high-end frequency of £20 GHz, rated output power is reduced by 1 dB; in models having a high-end frequency of
>20 GHz, rated output power is reduced by 2 dB.
B-9/B-10
Subject Index
Number
681XXC
Front Panel Layout, 3-6
General Description, 1-3
Manual, Electronic, 1-5
Manuals, Related, 1-5
Models, List of, 1-4
Options, List of, 1-6
Performance Specifications, B-1
Rear Panel Layout, A-2
A
ALC, 3-60
AM Mode
Menu Map, 4-15
Operating Modes, 3-73
Providing AM, 3-73
Analog Sweep Frequency Mode
Menu Map, 4-7
C
Calibration, Reference Oscillator, 3-92
Connectors
Front Panel, 3-7
Rear Panel, A-1
CW Frequency Accuracy Test
Test Procedure, 5-6
Test Records, 5-7 - 5-12
Test Setup, 5-5
CW Frequency Mode
Menu Map, 4-6
CW Power Sweep Mode
Menu Map, 4-12
Selecting a Sweep Range, 3-56
Selecting a Sweep Trigger, 3-55
Selecting CW Power Sweep Mode, 3-53
Selecting Linear or Logarithmic Sweep, 3-57
Setting Dwell Time, 3-54
Setting Step Size, 3-54
D
Data Display
Description, 3-8
681XXC OM
Menu Display Format, 3-9
Menu Keys, 3-10
Data Entry Area
Description, 3-12
Default Parameters, 3-16
E
Entering Data
Setting Increment Sizes, 3-88
Error Messages
Operation Related, 6-8
Self Test, 6-3 - 6-7
F
Fixed Power Level Mode
Menu Map, 4-11
FM Mode
Menu Map, 4-16
Operating Modes, 3-74
Providing FM, 3-75
Frequency Scaling, 3-81
Front Panel
Connectors, 3-7
Data Display Area, 3-6, 3-8
Data Entry Area, 3-7, 3-12
Description, 3-6
Layout, 3-6
G
General Description, 1-3
General Purpose Interface Bus (GPIB)
Address, 2-7
Cable Length Restrictions, 2-7
Interface Connector, 2-7
Line Terminator, 2-9
Native Interface Language, 2-9
SCPI Interface Language, 2-9
Setup and Interconnection, 2-7
I
Identification Number, 1-5
Initial Inspection, 2-3
Index 1
SUBJECT
INDEX
G
M
L
Leveling Operations
ALC Power Slope, 3-65
Attenuator Decoupling, 3-64
External Leveling, 3-61
Fixed Gain, 3-63
Internal Leveling, 3-61
Menu Map, 4-14
Selecting a Leveling Mode, 3-60
User Cal (User Level Flatness Correction), 3-67
List Sweep Frequency Mode
Menu Map, 4-10
M
Maintenance, Routine
Display Cleaning, 6-13
Fan Filter Cleaning, 6-13
Line Fuse Replacement, 6-14
Manual Sweep Frequency Mode
Menu Map, 4-9
Manual, Electronic, 1-5
Manual, GPIB Programming, 1-5
Manual, Maintenance, 1-6
Manual, SCPI Programming, 1-5
Master-Slave Operation, 7-4
Menu Maps
AM Mode, 4-15
Analog Sweep Frequency Mode, 4-7
CW Frequency Mode, 4-6
CW Power Sweep Mode, 4-12
Description, 4-3
Fixed Power Level Mode, 4-11
FM Mode, 4-16
Leveling Modes, 4-14
List Sweep Frequency Mode, 4-10
Manual Sweep Frequency Mode, 4-9
Sample Menu Map, 4-5
Square Wave Modulation Mode, 4-17
Step Sweep Frequency Mode, 4-8
Sweep Frequency/Step Power Mode, 4-13
System Configuration, 4-18
Messages
Error, 6-3 - 6-8
Status, 6-9
Warning, 6-9
Models, List of, 1-4
Modulation Modes
AM Mode, 3-73
FM Mode, 3-73
Index 2
Square Wave Modulation Mode, 3-73
O
Operating Environment, 2-6
Operational Verification Tests, 5-3
Operator Maintenance
Error and Warning/Status Messages, 6-3
Routine Maintenance, 6-13
Troubleshooting, 6-10
Options, List of, 1-6
P
Performance Specifications, 1-7, B-1
Power Level Accuracy and Flatness Tests
Accuracy Test Procedure, 5-14
Flatness Test Procedure, 5-15
Test Records, 5-19 - 5-45
Test Setup, 5-13
Power Level Control
Selecting a Preset Sweep Range, 3-57
Setting a Preset Sweep Range, 3-57
Power Level Modes
CW Power Sweep Mode, 3-53
Sweep Frequency/Step Power Mode, 3-53
Power Requirements, 2-4
Preparation for Storage/Shipment, 2-13
Preparation for Use, 2-4
Line Voltage Selection, 2-4
Operating Environment, 2-6
Power Requirements, 2-4
Standby Operation, 2-5
Warmup Time, 2-6
R
Rear Panel Connectors, A-1
Recommended Test Equipment, 1-8
Reference Oscillator Calibration, 3-92
S
Saving/Recalling Instrument Setups, 3-89
Scope of Manual, 1-3
Secure Operation, 3-91
Self Test
Error Messages, 6-3 - 6-7
From System Menu, 3-15
Specifications, Performance, B-1
Square Wave Modulation Mode
Menu Map, 4-17
681XXC OM
SUBJECT
INDEX
Operating Modes, 3-77
Providing Square Wave Modulation, 3-77
SS Mode Operation, 7-12
Start Up, 3-14
Start-Up Display, 3-14
Step Sweep Frequency Mode
Menu Map, 4-8
Sweep Frequency/Step Power Mode
Menu Map, 4-13
Selecting a Sweep Frequency/Step Power Mode,
3-58
Selecting a Sweep Range, 3-56
Selecting Linear or Logarithmic Sweep, 3-57
Setting Step Size, 3-59
System Configuration
Configuring the Front Panel, 3-81
Configuring the GPIB, 3-85
Configuring the Rear Panel, 3-82
Configuring the RF, 3-83
Frequency Scaling, 3-81
Menu Map, 4-18
681XXC OM
O
S
Setting Increment Sizes, 3-88
T
Test Equipment, 1-8, 5-3
Testing, Operational Verification
CW Frequency Accuracy, 5-5
Initial 681XXC Checkout, 5-4
Power Level Accuracy and Flatness, 5-13
Test Equipment, 5-3
Test Records, 5-3, 5-7 - 5-12, 5-19 - 5-45
Troubleshooting Tables, 6-10 - 6-12
U
Use With Other Instruments
Master-Slave Operation, 7-4
Use with a 360B Vector Network Analyzer, 7-11
Use with a 56100A Scalar Network Analyzer,
7-10
Use With a HP8757D Scalar Network Analyzer,
7-16
Index 3/Index 4