Agilent Technologies 33120A Welding System User Manual

Service Guide
Publication Number 33120-90017 (order as 33120-90104 manual set)
Edition 6, March 2002
© Copyright Agilent Technologies, Inc. 1994-2002
For Safety information, Warranties, and Regulatory information,
see the last page in this manual.
Agilent 33120A
15 MHz Function /
Arbitrary Waveform Generator
Cover Page for Web Version ONLY (Service Guide)
Note: Unless otherwise indicated, this manual applies to all Serial Numbers.
The Agilent Technologies 33120A is a high-performance 15 MHz
synthesized function generator with built-in arbitrary waveform
capability. Its combination of bench-top and system features makes this
function generator a versatile solution for your testing requirements now
and in the future.
Convenient bench-top features
œ 10 standard waveforms
œ Built-in 12-bit 40 MSa/s arbitrary waveform capability
œ Easy-to-use knob input
œ Highly visible vacuum-fluorescent display
œ Instrument state storage
œ Portable, ruggedized case with non-skid feet
Flexible system features
œ Four downloadable 16,000-point arbitrary waveform memories
œ GPIB (IEEE-488) interface and RS-232 interface are standard
œ SCPI (Standard Commands for Programmable Instruments) compatibility
œ Agilent IntuiLink Arb Waveform Generation Software for
Microsoft® Windows®
Warning
The procedures in this manual are intended for use by qualified,
service-trained personnel only.
Agilent 33120A
15 MHz Function /
Arbitrary Waveform Generator
Page 1 (Service Guide)
The Front Panel at a Glance
1
2
3
4
2
Function / Modulation keys
Menu operation keys
Waveform modify keys
Single / Internal Trigger key
(Burst and Sweep only)
5
6
7
8
Recall / Store instrument state key
Enter Number key
Shift / Local key
Enter Number “units” keys
Front-Panel Number Entry
You can enter numbers from the front-panel using one of three methods.
Use the knob and the arrow keys to modify the displayed number.
Use the arrow keys to edit individual digits.
Increments the flashing digit.
Decrements the flashing digit.
Moves the flashing digit to the right.
Moves the flashing digit to the left.
Use the “Enter Number” mode to enter a number with the appropriate units.
Use “Enter” for those operations that do not
require units to be specified (AM Level,
Offset, % Duty, and Store/Recall State).
3
The Front-Panel Menu at a Glance
The menu is organized in a top-down tree structure with three levels.
A: MODulation MENU
1: AM SHAPE
Õ
Õ
2: AM SOURCE
6: BURST PHAS
Õ
Õ
2: STOP F
Õ
Õ
3: FM SHAPE
7: BURST SRC
B: SWP (Sweep) MENU
1: START F
Õ
Õ
4: BURST CNT
8: FSK FREQ
3: SWP TIME
Õ
Õ
Õ
9: FSK RATE
5: BURST RATE
Õ
Õ
10: FSK SRC
4: SWP MODE
C: EDIT MENU*
1: NEW ARB
Õ [ 2: POINTS ] Õ [ 3: LINE EDIT ] Õ [ 4: POINT EDIT ] Õ [ 5: INVERT ] Õ [ 6: SAVE AS ] Õ 7: DELETE
* The commands enclosed in square brackets ( [ ] ) are “hidden” until you make a selection from the
NEW ARB command to initiate a new edit session.
D: SYStem MENU
1: OUT TERM
Õ
2: POWER ON
E: Input / Output MENU
1: HPIB ADDR
Õ
2: INTERFACE
Õ
3: ERROR
Õ
F: CALibration MENU*
1: SECURED or [ 1: UNSECURED ]
Õ
4: TEST
3: BAUD RATE
Õ
Õ
[ 2: CALIBRATE ]
Õ
5: COMMA
4: PARITY
Õ
Õ
Õ
6: REVISION
5: LANGUAGE
3: CAL COUNT
Õ
4: MESSAGE
* The commands enclosed in square brackets ( [ ] ) are “hidden” unless the function generator
is UNSECURED for calibration.
4
Display Annunciators
Adrs
Rmt
Trig
AM
FM
Ext
FSK
Burst
Swp
ERROR
Offset
Shift
Num
Arb
Function generator is addressed to listen or talk over a remote interface.
Function generator is in remote mode (remote interface).
Function generator is waiting for a single trigger or external trigger (Burst, Sweep).
AM modulation is enabled.
FM modulation is enabled.
Function generator is set for an external modulation source (AM, FSK, Burst).
FSK (frequency-shift keying) modulation is enabled.
Burst modulation is enabled.
Sweep mode is enabled.
Hardware or remote interface command errors are detected.
The waveform is being output with an offset voltage.
“Shift” key has been pressed. Press “Shift” again to turn off.
“Enter Number” mode is enabled. Press “Shift-Cancel” to disable.
Arbitrary waveform function is enabled.
Sine waveform function is enabled.
Square waveform function is enabled.
Triangle waveform function is enabled.
Ramp waveform function is enabled.
To review the display annunciators, hold down the Shift key as you
turn on the function generator.
5
The Rear Panel at a Glance
1
2
3
4
Chassis ground
Power-line fuse-holder assembly
Power-line voltage setting
AM modulation input terminal
5 External Trigger / FSK / Burst modulation
input terminal
6 GPIB (IEEE-488) interface connector
7 RS-232 interface connector
Use the front-panel Input / Output Menu to:
œ Select the GPIB or RS-232 interface (see chapter 4 in User’s Guide).
œ Set the GPIB bus address (see chapter 4 in User’s Guide).
œ Set the RS-232 baud rate and parity (see chapter 4 in User’s Guide).
6
In This Book
Specifications Chapter 1 lists the function generator’s specifications
and describes how to interpret these specifications.
Quick Start Chapter 2 prepares the function generator for use and
helps you get familiar with a few of its front-panel features.
Front-Panel Menu Operation Chapter 3 introduces you to the front-panel
menu and describes some of the function generator’s menu features.
Calibration Procedures Chapter 4 provides calibration, verification,
and adjustment procedures for the function generator.
Theory of Operation Chapter 5 describes block and circuit level theory
related to the operation the function generator.
Service Chapter 6 provides guidelines for returning your function
generator to Agilent for servicing, or for servicing it yourself.
Replaceable Parts Chapter 7 contains a detailed parts lists of the
function generator.
Schematics Chapter 8 contains the function generator’s block diagram,
schematics, disassembly drawings, and component locator drawings.
For information on using the Phase-Lock Option for the 33120A, refer to
the User’s and Service Guide included with the Option 001.
If you have questions relating to the operation of the 33120A,
call 1-800-452-4844 in the United States, or contact your nearest
Agilent Technologies Sales Office.
If you believe your 33120A has failed, refer to “Operating Checklist”,
“Types of Service Available”, and “Repackaging for Shipment” at the
beginning of chapter 6.
7
8
Contents
Chapter 1 Specifications
Chapter 2 Quick Start
To prepare the function generator for use 21
If the function generator does not turn on 22
To adjust the carrying handle 24
To set the output frequency 25
To set the output amplitude 26
To set a dc offset voltage 27
To set the duty cycle 28
To output a stored arbitrary waveform 29
To output a dc voltage 30
To store the instrument state 31
To rack mount the function generator 33
Contents
Chapter 3 Front-Panel Menu Operation
Front-panel menu reference 37
A front-panel menu tutorial 39
To select the output termination 44
To output a modulated waveform 45
To unsecure the function generator for calibration 47
Chapter 4 Calibration Procedures
Agilent Calibration Services 51
Calibration Interval 51
Time Required for Calibration 51
Automating Calibration Procedures 52
Recommended Test Equipment 52
Test Considerations 53
Performance Verification Tests 54
Frequency Verification 56
Function Gain and Linearity Verification 56
DC Function Offset Verification 57
AC Amplitude Verification 57
Amplitude Flatness Verification 60
AM Modulation Depth Verification 61
Optional Performance Verification Tests 62
9
Contents
Chapter 4 Calibration Procedures (continued)
Contents
Calibration Security Code 64
Calibration Count 66
Calibration Message 66
General Calibration/Adjustment Procedure 67
Aborting a Calibration in Progress 69
Frequency and Burst Rate Adjustment 69
Function Gain and Linearity Adjustment 70
AC Amplitude Adjustment (High-Z) 70
Modulation Adjustment 72
AC Amplitude Adjustment (50W) 73
DC Output Adjustment 76
Duty Cycle Adjustment 77
AC Amplitude Flatness Adjustment 77
Output Amplifier Adjustment (Optional) 80
Error Messages 81
Chapter 5 Theory of Operation
Block Diagram Overview 85
Output Attenuator 86
Output Amplifier 87
AM Modulation 89
Pre-attenuator 90
Square Wave and Sync 90
Filters 92
Waveform DAC/Amplitude Leveling/Waveform RAM 93
Direct Digital Synthesis (DDS ASIC) 95
System DACs 96
Floating Logic 97
Earth-Referenced Logic 98
Power Supplies 98
Display and Keyboard 100
10
Contents
Chapter 6 Service
Operating Checklist 103
Types of Service Available 104
Repackaging for Shipment 105
Cleaning 105
Electrostatic Discharge (ESD) Precautions 106
Surface Mount Repair 106
To Replace the Power-Line Fuse 107
To Replace the Output Protection Fuse (F801) 107
Troubleshooting Hints 108
Self-Test Procedures 110
Chapter 7 Replaceable Parts
Replaceable Parts 113
Contents
Chapter 8 Schematics
33120A Block Diagram 129
Mechanical Disassembly 130
Floating Logic Schematic 131
Digital Waveform Data Synthesis 132
System DAC Schematic 133
Waveform DAC Schematic 134
Filters Schematic 135
Sync, Square Wave, and Attenuator Schematic 136
Output Amplifier Schematic 137
Output Attenuator Schematic 138
Earth Reference Logic Schematic 139
Power Supplies Schematic 140
Display and Keyboard Schematic 141
33120-66521 Component Locator Diagram 142
33120-66502 Component Locator Diagram 143
11
12
Contents
1
1
Specifications
Chapter 1 Specifications
Agilent 33120A Function Generator
SIGNAL CHARACTERISTICS
WAVEFORMS
Standard Waveforms:
Arbitrary Waveforms:
Waveform Length:
Amplitude Resolution:
Sample Rate:
Non-Volatile Memory:
Sine, Square, Triangle,
Ramp, Noise, DC volts,
Sine(x)/x, Negative Ramp,
Exponential Rise,
Exponential Fall, Cardiac
Squarewave
Rise/Fall Time:
Overshoot:
Asymmetry:
Duty Cycle:
8 to 16,000 points
12 bits (including sign)
40 MSa / sec
Four 16,000-point waveforms
Triangle, Ramp, Arb
Rise/Fall Time:
Linearity:
Settling Time:
Jitter:
FREQUENCY CHARACTERISTICS
Sine:
Square:
Triangle:
Ramp:
Noise (Gaussian):
Arbitrary Waveforms:
8 to 8,192 points:
8,193 to 12,287 points:
12,288 to 16,000 points:
100 mHz – 15 MHz
100 mHz – 15 MHz
100 mHz – 100 kHz
100 mHz – 100 kHz
10 MHz bandwidth
Resolution:
10 mHz or 10 digits
Accuracy:
< 20 ns
< 4%
1% + 5 ns
20% to 80% (to 5 MHz)
40% to 60% (to 15 MHz)
40 ns (typical)
< 0.1% of peak output
< 250 ns to 0.5% of final value
< 25 ns
OUTPUT CHARACTERISTICS (1)
Amplitude (into 50W): (2)
Accuracy (at 1 kHz):
Flatness
< 100 kHz:
100 kHz to 1 MHz:
1 MHz to 15 MHz:
1 MHz to 15 MHz:
50 mVpp – 10 Vpp
– 1% of specified output
(sine wave relative to 1 kHz)
– 1% (0.1 dB)
– 1.5% (0.15 dB)
– 2% (0.2 dB) Ampl ˜ 3Vrms
– 3.5% (0.3 dB) Ampl < 3Vrms
Offset (into 50W): (3)
Accuracy: (4)
– 5 Vpk ac + dc
– 2% of setting + 2 mV
10 ppm in 90 days,
20 ppm in 1 year,
18•C – 28•C
Output Impedance:
50 ohms fixed
Resolution:
3 digits, Amplitude and Offset
Temperature Coefficient:
< 2 ppm / •C
Output Units:
Vpp, Vrms, dBm
Aging:
< 10 ppm / yr
Isolation:
42 Vpk maximum to earth
Protection:
Short-circuit protected
– 15 Vpk overdrive < 1 minute
100 mHz – 5 MHz
100 mHz – 2.5 MHz
100 mHz – 200 kHz
SINEWAVE SPECTRAL PURITY (into 50W)
Harmonic Distortion
DC to 20 kHz:
20 kHz to 100 kHz:
100 kHz to 1 MHz:
1 MHz to 15 MHz:
-70 dBc
-60 dBc
-45 dBc
-35 dBc
Total Harmonic Distortion
DC to 20 kHz:
< 0.04%
(1) Add 1/10th of output amplitude and offset specification
per •C for operation outside of 18•C to 28•C range
(1-year specification).
(2) 100 mVpp – 20 Vpp amplitude into open-circuit load.
Spurious (non-harmonic)
Output (DC to 1 MHz):
Output (> 1 MHz):
< -65 dBc
< -65 dBc + 6 dB/octave
Phase Noise:
< -55 dBc in a 30 kHz band
14
(3) Offset ˆ 2 X peak-to-peak amplitude.
(4) For square wave outputs, add 2% of output amplitude
additional error.
Chapter 1 Specifications
Agilent 33120A Function Generator
1
MODULATION CHARACTERISTICS
SYSTEM CHARACTERISTICS
AM Modulation
Carrier -3 dB Freq:
Modulation:
Frequency:
Configuration Times (2)
Function Change: (3)
Frequency Change: (3)
Amplitude Change:
Offset Change:
Select User Arb:
Modulation Parameter Change:
Depth:
Source:
FM Modulation
Modulation:
Frequency:
10 MHz (typical)
Any internal waveform plus Arb
10 mHz to 20 kHz ( – 0.05% to
2.5 kHz, then decreases linearly
to – 0.4% at upper limit)
0% to 120%
Internal / External
Peak Deviation:
Source:
Any internal waveform plus Arb
10 mHz to 10 kHz ( – 0.05% to
600 Hz, then decreases linearly
to – 0.8% at upper limit)
10 mHz to 15 MHz
Internal Only
Burst Modulation
Carrier Frequency:
Count:
Start Phase:
Internal Rate:
Gate Source:
Trigger Source:
5 MHz max.
1 to 50,000 cycles, or Infinite
-360• to +360•
10 mHz to 50 kHz –1%
Internal or External Gate (1)
Single, External, or Internal Rate
FSK Modulation
Frequency Range:
Internal Rate:
Source:
10 mHz to 15 MHz ( – 0.05% to
600 Hz, then decreases linearly
to – 4% at upper limit)
10 mHz to 50 kHz
Internal / External (1 MHz max.)
80 ms
30 ms
30 ms
10 ms
100 ms
< 350 ms
Arb Download Times over GPIB:
Arb Length
Binary
ASCII Integer
16,000 points
8,192 points
4,096 points
2,048 points
8 sec
4 sec
2.5 sec
1.5 sec
81 sec
42 sec
21 sec
11 sec
ASCII Real (4)
100 sec
51 sec
26 sec
13 sec
Arb Download Times over RS-232 at 9600 Baud: (5)
Arb Length
Binary
ASCII Integer
16,000 points
8,192 points
4,096 points
2,048 points
35 sec
18 sec
10 sec
6 sec
101 sec
52 sec
27 sec
14 sec
ASCII Real (6)
134 sec
69 sec
35 sec
18 sec
FREQUENCY SWEEP
Type:
Direction:
Start F / Stop F:
Time:
Source:
Linear or Logarithmic
Up or Down
10 mHz to 15 MHz
1 ms to 500 sec –0.1%
Single, External, or Internal
(1) Trigger source ignored when External Gate is selected.
(2) Time to change parameter and output the new signal.
REAR-PANEL INPUTS
External AM
Modulation:
External Trigger/FSK
Burst Gate: (1)
Latency:
Jitter:
– 5 Vpk = 100% Modulation
5 kW Input Resistance
TTL (low true)
1.3 ms
25 ns
(3) Modulation or sweep off.
(4) Times for 5-digit and 12-digit numbers.
(5) For 4800 baud, multiply the download times by two;
For 2400 baud, multiply the download times by four, etc.
(6) Time for 5-digit numbers. For 12-digit numbers,
multiply the 5-digit numbers by two.
15
Chapter 1 Specifications
Agilent 33120A Function Generator
GENERAL SPECIFICATIONS
Power Supply: (1)
100V / 120V / 220V / 240V –10%
(switch selectable)
Power-Line Frequency:
50 Hz to 60 Hz –10% and
400 Hz –10%. Automatically
sensed at power-on.
Power Installation:
Safety Designed to:
EN61010, CSA1010, UL-1244
EMC:
EN61326, 1:1997 + 1A:1998
Vibration and Shock:
MIL-T-28800E, Type III, Class 5
(data on file)
CAT II
Acoustic Noise:
30 dBa
Power Consumption:
50 VA peak (28 W average)
Warm-Up Time:
1 hour
Operating Environment:
0•C to 55•C
80% Relative Humidity to 40•C
Indoor or sheltered location
Warranty:
3 years standard
Remote Interface:
IEEE-488 and RS-232 standard
Storage Environment:
-40•C to 70•C
Programming Language:
SCPI-1993, IEEE-488.2
State Storage Memory:
Power-off state automatically
saved. Three (3) UserConfigurable Stored States,
Arbitrary waveforms stored
separately.
Accessories Included:
User’s Guide, Service Guide,
Quick Reference Card,
IntuiLink Arb software,
RS-232 cable, Test Report,
and power cord.
Dimensions (W x H x D)
Bench Top:
Rack Mount:
254.4 mm x 103.6 mm x 374 mm
212.6 mm x 88.5 mm x 348.3 mm
Weight:
4 kg (8.8 lbs)
(1) For 400 Hz operation at 120 Vac, use the 100 Vac
line-voltage setting.
16
N10149
Chapter 1 Specifications
Agilent 33120A Function Generator
1
PRODUCT DIMENSIONS
TOP
All dimensions are
shown in millimeters.
17
18
2
2
Quick Start
Quick Start
One of the first things you will want to do with your function generator is
to become acquainted with its front panel. We have written the exercises
in this chapter to prepare the function generator for use and help you get
familiar with some of the front-panel operations.
The front panel has two rows of keys to select various functions and
operations. Most keys have a shifted function printed in blue above the
key. To perform a shifted function, press Shift (the Shift annunciator will
turn on). Then, press the key that has the desired label above it. For
example, to select the AM (amplitude modulation) function, press
Shift AM (the shifted version of the
key).
If you accidentally press Shift , just press it again to turn off the Shift
annunciator.
Most keys also have a number printed in green next to the key. To enable
the number mode, press Enter Number (the Num annunciator will turn on).
Then, press the keys that have the desired numbers printed next to them.
For example, to select the number “10”, press Enter Number 1 0
(next to the
and Recall keys).
If you accidentally press Enter Number , just press Shift Cancel to turn
off the Num annunciator.
20
Chapter 2 Quick Start
To prepare the function generator for use
To prepare the function generator for use
The following steps help you verify that the function generator is
ready for use.
2
1 Check the list of supplied items.
Verify that you have received the following items with your function
generator. If anything is missing, contact your nearest Agilent
Technologies Sales Office.
One power cord.
One RS-232 serial cable.
One User’s Guide.
á This Service Guide.
One folded Quick Reference card.
Certificate of Calibration.
Agilent IntuiLink Arb Waveform Generation Software.
2 Connect the power cord and turn on the function generator.
If the function generator does not turn on, see chapter 6 for troubleshooting
information. The front-panel display will light up while the function
generator performs its power-on self-test. The GPIB bus address is
displayed. Notice that the function generator powers up in the sine wave
function at 1 kHz with an amplitude of 100 mV peak-to-peak (into a 50W
termination).
To review the power-on display with all annunciators turned on,
hold down Shift as you turn on the function generator.
3 Perform a complete self test.
The complete self-test performs a more extensive series of tests than
those performed at power-on. Hold down Shift as you press the Power
switch to turn on the function generator; hold down the key for more than
5 seconds. The self-test will begin when you release the key.
If the self-test is successful, “PASS” is displayed on the front panel.
If the self-test is not successful, “FAIL” is displayed and the ERROR
annunciator turns on. See chapter 6 for instructions on returning the
function generator to Agilent for service.
21
Chapter 2 Quick Start
If the function generator does not turn on
If the function generator does not turn on
Use the following steps to help solve problems you might experience
when turning on the function generator. If you need more help,
see chapter 6 for instructions on returning the function generator to
Agilent for service.
1 Verify that there is ac power to the function generator.
First, verify that the function generator’s Power switch is in the
“On” position. Also, make sure that the power cord is firmly plugged into
to the power module on the rear panel. You should also make sure that
the power source you plugged the function generator into is energized.
2 Verify the power-line voltage setting.
The line voltage is set to the proper value for your country when the
function generator is shipped from the factory. Change the voltage
setting if it is not correct. The settings are: 100, 120, 220, or 240 Vac
(for 230 Vac operation, use the 220 Vac setting).
See the next page if you need to change the line-voltage setting.
3 Verify that the power-line fuse is good.
The function generator is shipped from the factory with a 500 mAT fuse
installed. This is the correct fuse for all line voltages.
See the next page if you need to change the power-line fuse.
To replace the 500 mAT fuse, order Agilent part number 2110-0458.
22
Chapter 2 Quick Start
If the function generator does not turn on
1 Remove the power cord. Remove the
fuse-holder assembly from the rear panel.
2 Remove the line-voltage selector from
the assembly.
2
Fuse: 500 mAT (for all line voltages)
Part Number: 2110-0458
3 Rotate the line-voltage selector until the
correct voltage appears in the window.
4 Replace the fuse-holder assembly in
the rear panel.
100, 120, 220 (230), or 240 Vac
Verify that the correct line voltage is selected and the power-line fuse is good.
23
Chapter 2 Quick Start
To adjust the carrying handle
To adjust the carrying handle
To adjust the position, grasp the handle by the sides and pull outward.
Then, rotate the handle to the desired position.
Bench-top viewing positions
24
Carrying position
Chapter 2 Quick Start
To set the output frequency
To set the output frequency
At power-on, the function generator outputs a sine wave at 1 kHz with
an amplitude of 100 mV peak-to-peak (into a 50W termination).
The following steps show you how to change the frequency to 1.2 MHz.
2
1 Enable the frequency modify mode.
Freq
The displayed frequency is either the power-on value or the previous
frequency selected. When you change functions, the same frequency is
used if the present value is valid for the new function.
1.000,000,0 KHz
Enter Number
1
.
2 Enter the magnitude of the desired frequency.
1
Notice that the Num annunciator turns on and “ENTER NUM” flashes on
the display, indicating that the number mode is enabled.
2
1.2
To cancel the number mode, press Shift Cancel .
¾
MHz
m Vpp
3 Set the units to the desired value.
The units are selected using the arrow keys on the right side of the front
panel. As soon as you select the units, the function generator outputs the
waveform with the displayed frequency. To turn off the flashing digit,
move the cursor to the left of the display using the arrow keys.
1.200,000,0 MHz
1
You can also use the knob and arrow keys to enter a number.
25
Chapter 2 Quick Start
To set the output amplitude
To set the output amplitude
At power-on, the function generator outputs a sine wave with an
amplitude of 100 mV peak-to-peak (into a 50W termination).
The following steps show you how to change the amplitude to 50 mVrms.
1 Enable the amplitude modify mode.
Ampl
The displayed amplitude is either the power-on value or the previous
amplitude selected. When you change functions, the same amplitude is
used if the present value is valid for the new function.
100.0
Enter Number
5
mVPP
2 Enter the magnitude of the desired amplitude.
1
Notice that the Num annunciator turns on and “ENTER NUM” flashes on
the display, indicating that the number mode is enabled.
0
50
To cancel the number mode, press Shift Cancel .
3 Set the units to the desired value.
Shift
¿
The units are selected using the arrow keys on the right side of the front
panel. As soon as you select the units, the function generator outputs the
waveform with the displayed amplitude. To turn off the flashing digit,
move the cursor to the left of the display using the arrow keys.
kHz
m Vrms
50.00
1
mVRMS
You can also use the knob and arrow keys to enter a number.
26
Chapter 2 Quick Start
To set a dc offset voltage
To set a dc offset voltage
At power-on, the function generator outputs a sine wave with a dc offset
voltage of 0 volts (into a 50W termination). The following steps show you
how to change the offset to –1.5 mVdc.
1 Enable the offset modify mode.
Offset
The displayed offset voltage is either the power-on value or the previous
offset selected. When you change functions, the same offset is used if the
present value is valid for the new function.
+0.000
2 Enter the magnitude of the desired offset.
Enter Number
–
1
.
VDC
1
Notice that the Num annunciator turns on and “ENTER NUM” flashes on
the display, indicating that the number mode is enabled. Notice that –
toggles the displayed value between + and – .
5
-1.5
To cancel the number mode, press Shift Cancel .
3 Set the units to the desired value.
Shift
¿
At this point, the function generator outputs the waveform with the
displayed offset. Notice that the Offset annunciator turns on, indicating
that the waveform is being output with an offset. The annunciator will
turn on when the offset is any value other than 0 volts. To turn off the
flashing digit, move the cursor to the left of the display using the arrow keys.
kHz
m Vrms
-01.50
1
mVDC
You can also use the knob and arrow keys to enter a number.
27
2
Chapter 2 Quick Start
To set the duty cycle
To set the duty cycle
Applies only to square waves. At power-on, the duty cycle for square waves
is 50%. You can adjust the duty cycle for a square waveform from 20%
to 80%, in increments of 1% (for frequencies above 5 MHz, the range is 40%
to 60%). The following steps show you how to change the duty cycle to 45%.
1 Select the square wave function.
Notice that the
annunciator turns on, indicating that the square
wave function is enabled.
Shift
% Duty
2 Enable the duty cycle modify mode.
The displayed duty cycle is either the power-on value or the previous
value selected.
50 % DUTY
This message appears on the display for approximately 10 seconds.
Repeat this step as needed.
Enter Number
4
3 Enter the desired duty cycle.
1
Notice that the Num annunciator turns on and “ENTER NUM” flashes on
the display, indicating that the number mode is enabled.
5
45
To cancel the number mode, press Shift Cancel .
Enter
4 Output the waveform with the displayed duty cycle.
45 % DUTY
1
You can also use the knob and arrow keys to enter a number.
28
Chapter 2 Quick Start
To output a stored arbitrary waveform
To output a stored arbitrary waveform
There are five built-in arbitrary waveforms stored in non-volatile memory
for your use. You can output these waveforms directly from non-volatile
memory. The following steps show you how to output an “exponential rise”
waveform from memory.
Shift
Arb List
1 Display the list of arbitrary waveforms.
The list contains the five built-in arbitrary waveforms (sinc, negative
ramp, exponential rise, exponential fall, and cardiac). The list may also
contain up to four user-defined arbitrary waveform names. The first
choice on this level is “SINC”.
SINC
This message appears on the display for approximately 10 seconds.
Repeat this step as needed.
>
>
2 Move across to the EXP_RISE choice.
1
EXP_RISE
Enter
3 Select and output the displayed arbitrary waveform.
Notice that the Arb annunciator turns on, indicating that the output is an
arbitrary waveform. The waveform is output using the present settings
for frequency, amplitude, and offset unless you change them.
The selected waveform is now assigned to the Arb key. Whenever you
press this key, the selected arbitrary waveform is output.
1
You can also use the knob to scroll left or right through the choices in the list.
29
2
Chapter 2 Quick Start
To output a dc voltage
To output a dc voltage
In addition to generating waveforms, you can also output a dc voltage in
the range – 5 Vdc (into a 50W termination). The following steps show you
how to output +155 mVdc.
1 Press the Offset key and hold it down for more than 2 seconds.
To enter the dc voltage mode, press the Offset key or any key in the top row
of function keys and hold it down for more than 2 seconds. The displayed
voltage is either the power-on value or the previous offset voltage selected.
DCV
+0.000
Enter Number
1
5
VDC
2 Enter the magnitude of the desired voltage.
1
Notice that the Num annunciator turns on and “ENTER NUM” flashes on
the display, indicating that the number mode is enabled.
5
155
To cancel the number mode, press Shift Cancel .
3 Set the units to the desired value.
Shift
¿
At this point, the function generator outputs the displayed dc voltage.
Notice that the Offset annunciator turns on (all other annunciators are
off), indicating that a dc voltage is being output. The annunciator will
turn on when the offset is any value other than 0 volts.
kHz
m Vrms
+155.0
1
mVDC
You can also use the knob and arrow keys to enter a number.
30
Chapter 2 Quick Start
To store the instrument state
To store the instrument state
You can store up to three different instrument states in non-volatile
memory. This enables you to recall the entire instrument configuration
with just a few key presses from the front panel. The following steps show
you how to store and recall a state.
1 Set up the function generator to the desired configuration.
The state storage feature “remembers” the function, frequency,
amplitude, dc offset, duty cycle, as well as any modulation parameters.
Shift
Store
2 Turn on the state storage mode.
Three memory locations (numbered 1, 2, and 3) are available to store
instrument configurations. The instrument configuration is stored in
non-volatile memory and is remembered when power has been off.
STORE
1
This message appears on the display for approximately 10 seconds.
Repeat this step as needed.
¾
3 Store the instrument state in memory location “2”.
1
Use the up and down arrow keys to select the memory location.
STORE
2
To cancel the store operation, press Shift Store again or let the display
time-out after 10 seconds.
Enter
4 Save the instrument state.
The instrument state is now stored. To recall the stored state, turn to the
next page.
1
You can also use the knob or “enter number” mode to enter a memory location.
31
2
Chapter 2 Quick Start
To store the instrument state
To verify that the state was stored properly, you can turn the power off
before recalling the state.
Recall
5 Recall the stored instrument state.
To recall the stored state, you must use the same memory location used
previously to store the state. Use the up and down arrow keys to change
the displayed storage location.
RECALL
2
To cancel the restore operation, press Recall again.
This message appears on the display for approximately 10 seconds.
Repeat this step as needed.
Enter
6 Restore the instrument state.
The function generator should now be configured in the same state as
when you stored the setup on the previous page.
When power is turned off, the function generator automatically stores
its state in memory location “0”. You can recall the power-down state,
but you cannot store the state to location “0” from the front panel.
Use the POWER ON ENABLE command in the SYS MENU to
automatically recall the power-down state when power is turned on.
See chapter 3 for more information on using the front-panel menus.
32
Chapter 2 Quick Start
To rack mount the function generator
To rack mount the function generator
You can mount the function generator in a standard 19-inch rack
cabinet using one of three optional kits available. Instructions and
mounting hardware are included with each rack-mounting kit.
Any Agilent System II instrument of the same size can be rack-mounted
beside the 33120A Function Generator.
Remove the carrying handle, and the front and rear rubber bumpers,
before rack-mounting the function generator.
To remove the handle, rotate it to the vertical position and pull the ends outward.
Front
Rear (bottom view)
To remove the rubber bumper, stretch a corner and then slide it off.
33
2
Chapter 2 Quick Start
To rack mount the function generator
To rack mount a single instrument, order adapter kit 5063-9240.
To rack mount two instruments side-by-side, order lock-link kit 5061-9694
and flange kit 5063-9212.
To install one or two instruments in a sliding support shelf, order shelf 5063-9255,
and slide kit 1494-0015 (for a single instrument, also order filler panel 5002-3999).
34
3
3
Front-Panel
Menu Operation
Front-Panel Menu Operation
By now you should be familiar with some of the basic features of the front
panel. Chapter 2 shows you how to prepare the function generator for use
and describes a few of the front-panel features. If you are not familiar
with this information, we recommend that you read chapter 2, “Quick Start,”
starting on page 19.
Chapter 3 introduces you to the use of the front-panel menu. This chapter
does not give a detailed description of every front-panel key or menu
operation. It does, however, give you an overview of front-panel menu
operations related to verification, adjustment and service. See chapter 3
“Features and Functions” in the User’s Guide for a complete discussion of
the function generator’s capabilities and operation.
If you purchased the Phase-Lock Option for the 33120A, an additional
menu (G: PHASE MENU) is available from the front panel. For information on using the Phase-Lock Option, refer to the User’s and Service
Guide included with Option 001.
36
Chapter 3 Front-Panel Menu Operation
Front-panel menu reference
Front-panel menu reference
A: MODulation MENU
1: AM SHAPE
Õ 2: AM SOURCE Õ 3: FM SHAPE Õ 4: BURST CNT Õ 5: BURST RATE Õ
Õ 6: BURST PHAS Õ 7: BURST SRC Õ 8: FSK FREQ Õ 9: FSK RATE Õ 10: FSK SRC
1: AM SHAPE
2: AM SOURCE
3: FM SHAPE
4: BURST CNT
5: BURST RATE
6: BURST PHAS
7: BURST SRQ
8: FSK FREQ
9: FSK RATE
10: FSK SRC
Selects the shape of the AM modulating waveform.
Enables or disables the internal AM modulating source.
Selects the shape of the FM modulating waveform.
Sets the number of cycles per burst (1 to 50,000 cycles).
Sets the burst rate in Hz for an internal burst source.
Sets the starting phase angle of a burst (-360 to +360 degrees).
Selects an internal or external gate source for burst modulation.
Sets the FSK “hop” frequency.
Selects the internal FSK rate between the carrier and FSK frequency.
Selects an internal or external source for the FSK rate.
B: SWP (Sweep) MENU
1: START F
Õ 2: STOP F Õ 3: SWP TIME Õ 4: SWP MODE
1: START F
2: STOP F
3: SWP TIME
4: SWP MODE
Sets the start frequency in Hz for sweeping.
Sets the stop frequency in Hz for sweeping.
Sets the repetition rate in seconds for sweeping.
Selects linear or logarithmic sweeping.
C: EDIT MENU *
1: NEW ARB
Õ 2: POINTS Õ [3: LINE EDIT] Õ [4: POINT EDIT] Õ [5: INVERT] Õ [6: SAVE AS] Õ 7:DELETE
1: NEW ARB
2: POINTS
3: LINE EDIT
4: POINT EDIT
5: INVERT
6: SAVE AS
7: DELETE
Initiates a new arb waveform or loads the selected arb waveform.
Sets the number of points in a new arb waveform (8 to 16,000 points).
Performs a linear interpolation between two points in the arb waveform.
Edits the individual points of the selected arb waveform.
Inverts the selected arb waveform by changing the sign of each point.
Saves the current arb waveform in non-volatile memory.
Deletes the selected arb waveform from non-volatile memory.
* The commands enclosed in square brackets ( [ ] ) are “hidden” until you make a selection from the NEW ARB
command to initiate a new edit session.
37
3
Chapter 3 Front-Panel Menu Operation
Front-panel menu reference
D: SYStem MENU
Õ 2: POWER ON Õ 3: ERROR Õ 4: TEST Õ 5: COMMA Õ 6:REVISION
1: OUT TERM
1: OUT TERM
2: POWER ON
3: ERROR
4: TEST
5: COMMA
6: REVISION
Selects the output termination (50W or high impedance).
Enables or disables automatic power-up in power-down state “0”.
Retrieves errors from the error queue (up to 20 errors).
Performs a complete self-test.
Enables or disables a comma separator between digits on the display.
Displays the function generator’s firmware revision codes.
E: Input / Output MENU
1: HPIB ADDR
Õ 2: INTERFACE Õ 3: BAUD RATE Õ 4: PARITY Õ 5: LANGUAGE
1: HPIB ADDR
2: INTERFACE
3: BAUD RATE
4: PARITY
5: LANGUAGE
Sets the GPIB bus address (0 to 30).
Selects the GPIB or RS-232 interface.
Selects the baud rate for RS-232 operation.
Selects even, odd, or no parity for RS-232 operation.
Verifies the interface language: SCPI.
F: CALibration MENU *
1: SECURED
Õ [1: UNSECURED] Õ [2: CALIBRATE] Õ 3: CAL COUNT Õ 4: MESSAGE
1: SECURED
1: UNSECURED
2: CALIBRATE
3: CAL COUNT
4: MESSAGE
The function generator is secured against calibration; enter code to unsecure.
The function generator is unsecured for calibration; enter code to secure.
Performs individual calibrations; must be UNSECURED.
Reads the total number of times the function generator has been calibrated.
Reads the calibration string (up to 11 characters) entered from remote.
* The commands enclosed in square brackets ( [ ] ) are “hidden” unless the function generator is UNSECURED for
calibration.
38
Chapter 3 Front-Panel Menu Operation
A front-panel menu tutorial
A front-panel menu tutorial
This section is a step-by-step tutorial which shows you how to use the
front-panel menu. We recommend that you spend a few minutes with this
tutorial to get comfortable with the structure and operation of the menu
before attempting verification, calibration, or adjustments.
The menu is organized in a top-down tree structure with three levels
(menus, commands, and parameters). You move down ¿ or up ¾
the menu tree to get from one level to the next. Each of the three levels
has several horizontal choices which you can view by moving left <
or right > .
3
Menus
Commands
Parameters
The menu is organized in a top-down tree structure with three levels.
œ To turn on the menu, press Shift
œ To turn off the menu, press Shift
Menu On/Off .
Menu On/Off .
œ To execute a menu command, press Enter .
œ To recall the last menu command that was executed,
press Shift Recall Menu .
œ To turn off the menu at any time without saving changes,
press Shift Cancel .
39
Chapter 3 Front-Panel Menu Operation
A front-panel menu tutorial
Messages Displayed During Menu Use
TOP OF MENU You pressed ¾ while on the “MENUS” level; this is the top
level of the menu and you cannot go any higher.
To turn off the menu, press Shift Menu On/Off . To move across the choices on
a level, press < or > . To move down a level, press ¿ .
MENUS You are on the “MENUS” level. Press
< or >
to view the choices.
COMMANDS You are on the “COMMANDS” level. Press < or > to view the
command choices within the selected menu group.
PARAMETER You are on the “PARAMETER” level. Press < or > to view
and edit the parameter for the selected command.
MENU BOTTOM You pressed ¿ while on the “PARAMETER” level; this is the
bottom level of the menu and you cannot go any lower.
To turn off the menu, press Shift Menu On/Off . To move up a level, press ¾ .
ENTERED The change made on the “PARAMETER” level is saved. This is
displayed after you press Enter (Menu Enter) to execute the command.
MIN VALUE The value you specified on the “PARAMETER” level is too small for
the selected command. The minimum value allowed is displayed for you to edit.
MAX VALUE The value you specified on the “PARAMETER” level is too large for
the selected command. The maximum value allowed is displayed for you to edit.
EXITING
You will see this message if you turn off the menu by pressing
Shift Menu On/Off or Shift Cancel . You did not edit any values on the
“PARAMETER” level and changes were NOT saved.
NOT ENTERED
You will see this message if you turn off the menu by pressing
Shift Menu On/Off or Shift Cancel . You did some editing of parameters but
the changes were NOT saved. Press Enter (Menu Enter) to save changes
made on the “PARAMETER” level.
40
Chapter 3 Front-Panel Menu Operation
A front-panel menu tutorial
The following steps show you how to turn on the menu, move up and
down between levels, move across the choices on each level, and turn off
the menu. In this example, you will restore the function generator to the
power-on default state. This procedure is recommended before performing
the verification procedures in chapter 4.
Menu Example 1
1 Turn on the menu.
Shift
You enter the menu on the “MENUS” level. The MOD MENU is your first
choice on this level.
Menu On/Off
3
A: MOD MENU
>
>
>
2 Move across to the SYS MENU choice on this level.
1
There are six menu group choices available on the “MENUS” level. Each
choice has a letter prefix for easy identification (A: , B: , etc.).
D: SYS MENU
¿
3 Move down to the “COMMANDS” level within the SYS MENU.
The OUT TERM command is your first choice on this level.
1: OUT TERM
>
4 Move across to the POWER ON command on this level.
1
There are six command choices available in the SYS MENU. Each choice
on this level has a number prefix for easy identification (1: , 2: , etc.).
2: POWER ON
1
You can also use the knob to scroll left or right through the choices on each
level of the menu.
41
Chapter 3 Front-Panel Menu Operation
A front-panel menu tutorial
¿
5 Move down a level to the “PARAMETER” choices.
The first parameter choice is “DEFAULT” for the POWER ON command
(“DEFAULT” is the factory setting and is stored in non-volatile memory).
DEFAULT
>
6 Move across to the “LAST STATE” choice.
1
There are two parameter choices for POWER ON.
LAST STATE
Enter
7 Save the change and turn off the menu.
The function generator beeps and displays a message to show that the
change is now in effect. You are then exited from the menu.
ENTERED
8 Cycle the power to restore the default values.
Turn the function generator OFF and then ON. The default output
state will now be in effect (1 kHz sine wave, 100 mV peak-to-peak,
50W termination).
1
You can also use the knob to scroll left or right through the choices on each
level of the menu.
42
Chapter 3 Front-Panel Menu Operation
A front-panel menu tutorial
Some commands in the menu require that you enter a numeric
parameter value. The following steps show you how to enter a number in
the menu. For this example, you will change the output amplitude.
Menu Example 2
1 Select amplitude adjustment
Ampl
The function generator displays the current output amplitude.
100.0
mVPP
3
2 Move the flashing cursor over to edit the first digit.
<
The cursor movement wraps around.
100.0
^
^
^
mVPP
3 Increment the first digit until 300.0 mVPP is displayed.
1
The output amplitude of the function changes as you adjust the
displayed value.
300.0
1
mVPP
You can also use the knob and arrow keys to enter a number.
43
Chapter 3 Front-Panel Menu Operation
To select the output termination
To select the output termination
The function generator has a fixed output impedance of 50 ohms on the
OUTPUT terminal. You can specify whether you are terminating the
output into a 50W load or an open circuit. Incorrect impedance matching
between the source and load will result in an output amplitude or dc offset
which does not match the specified value.
1 Turn on the menu.
Shift
A: MOD MENU
Menu On/Off
>
>
>
2 Move across to the SYS MENU choice on this level.
1
D: SYS MENU
3 Move down a level to the OUT TERM command.
¿
1: OUT TERM
¿
>
4
Move down a level and then across to the HIGH Z choice.
1
With the output termination set to “HIGH Z”, the function generator
allows you to set the unloaded (open circuit) output voltage.
HIGH Z
Enter
5 Save the change and turn off the menu.
The function generator beeps and displays a message to show that the
change is now in effect. You are then exited from the menu.
1
You can also use the knob to scroll left or right through the choices on each
level of the menu.
44
Chapter 3 Front-Panel Menu Operation
To output a modulated waveform
To output a modulated waveform
A modulated waveform consists of a carrier and a modulating waveform.
In AM (amplitude modulation), the amplitude of the carrier is varied by
the amplitude of the modulating waveform. For this example, you will
output an AM waveform with 80% modulation depth. The carrier will be a
5 kHz sine wave and the modulating waveform will be a 200 Hz sine wave.
3
1 Select the function, frequency, and amplitude of the carrier.
For the carrier waveform, you can select a sine, square, triangle, ramp,
or arbitrary waveform. For this example, select a 5 kHz sine wave with
an amplitude of 5 Vpp.
Shift
AM
2 Select AM.
Notice that the AM annunciator turns on.
3 Use the menu to select the shape of the modulating waveform.
Shift
<
Recall Menu
After you enable the AM function, the “recall menu” key will
automatically take you to the AM SHAPE command in the MOD MENU.
1: AM SHAPE
45
Chapter 3 Front-Panel Menu Operation
To output a modulated waveform
4 Move down a level verify that “SINE” is selected.
¿
For the modulating waveform, you can select a sine, square, triangle,
ramp, noise, or arbitrary waveform. For this example, you will modulate
the carrier with a sine waveform. Notice that the AM annunciator flashes,
indicating that the displayed parameter is for AM.
SINE
5 Save the change and turn off the menu.
Enter
The modulating waveform is now a sine waveform.
ENTERED
Shift
Freq
6 Set the modulating frequency to 200 Hz.
Notice that the AM annunciator flashes, indicating that the displayed
frequency is the modulating frequency. Also notice that the modulating
frequency is displayed with fewer digits than the carrier frequency.
MOD
200.0
Hz
This message appears on the display for approximately 10 seconds.
Repeat this step as needed.
Shift
Level
7 Set the modulation depth to 80%.
Notice that the AM annunciator flashes, indicating that the displayed
percentage is the AM depth (also called percent modulation).
080
%
DEPTH
This message appears on the display for approximately 10 seconds.
Repeat this step as needed.
At this point, the function generator outputs the AM waveform with the
specified modulation parameters.
46
Chapter 3 Front-Panel Menu Operation
To unsecure the function generator for calibration
To unsecure the function generator for calibration
The function generator can use a calibration security code to prevent
unauthorized or accidental calibration. This procedure shows you how to
unsecure the function generator for calibration.
Shift
Menu On/Off
<
1 Turn on the menu.
A: MOD MENU
3
2 Move across to the CAL MENU choice on this level.
F: CAL MENU
¿
3 Move down a level to the SECURED command.
1: SECURED
If the display shows UNSECURED, you do not need to perform this
procedure to execute a calibration.
47
Chapter 3 Front-Panel Menu Operation
To unsecure the function generator for calibration
4 Move down to the “parameters” level.
¿
^000000:CODE
0
3
3
1
2
0
ENTER
5 Unsecure the function generator by entering the security code.
^033120:CODE
The security code is set to “HP33120” when the function generator is
shipped from the factory. The security code is stored in non-volatile
memory and does not change when the power has been off or after a
remote interface reset.
To enter the security code from the front panel, enter only the six digits.
To enter the security code from the remote interface, you may enter up to
12 characters. Use the knob or arrow keys to move left or right between
digits. Use the up or down arrow keys to change the digits.
To re-secure the function generator following a calibration, perform this
procedure again.
Additional information about the calibration security feature is given
on page 64.
48
4
4
Calibration
Procedures
Calibration Procedures
This chapter contains procedures for verification of the function
generator’s performance and adjustment (calibration). The chapter is
divided into the following sections:
œ Agilent Calibration Services . . . . . . . . . . . . . . 51
œ Calibration Interval . . . . . . . . . . . . . . . . . . . 51
œ Time Required for Calibration . . . . . . . . . . . . . 51
œ Automating Calibration Procedures . . . . . . . . . . 52
œ Recommended Test Equipment . . . . . . . . . . . . . 52
œ Test Considerations . . . . . . . . . . . . . . . . . . . 53
œ Performance Verification Tests . . . . . . . . . . . . . 54
œ Frequency Verification . . . . . . . . . . . . . . . . . 56
œ Function Gain and Linearity Verification . . . . . . . 56
œ DC Function Offset Verification . . . . . . . . . . . . 57
œ AC Amplitude Verification . . . . . . . . . . . . . . . 57
œ Amplitude Flatness Verification . . . . . . . . . . . . 60
œ AM Modulation Depth Verification . . . . . . . . . . . 61
œ Optional Performance Verification Tests . . . . . . . . 62
œ Calibration Security Code . . . . . . . . . . . . . . . . 64
œ Calibration Count . . . . . . . . . . . . . . . . . . . . 66
œ Calibration Message . . . . . . . . . . . . . . . . . . . 66
œ General Calibration/Adjustment Procedure . . . . . . 67
œ Aborting a Calibration in Progress . . . . . . . . . . . 69
œ Frequency and Burst Rate Adjustment
. . . . . . . . 69
œ Function Gain and Linearity Adjustment . . . . . . . 70
œ AC Amplitude Adjustment (High-Z) . . . . . . . . . . 70
œ Modulation Adjustment . . . . . . . . . . . . . . . . . 72
œ AC Amplitude Adjustment (50W) . . . . . . . . . . . . 73
œ DC Output Adjustment . . . . . . . . . . . . . . . . . 76
œ Duty Cycle Adjustment . . . . . . . . . . . . . . . . . 77
œ AC Amplitude Flatness Adjustment . . . . . . . . . . 77
œ Output Amplifier Adjustment (Optional)
. . . . . . . 80
œ Error Messages . . . . . . . . . . . . . . . . . . . . . 81
50
Chapter 4 Calibration Procedures
Agilent Calibration Services
Closed-Case Electronic Calibration The function generator features
closed-case electronic calibration since no internal mechanical
adjustments are required for normal calibration. The function generator
calculates correction factors based upon the input reference value you set.
The new correction factors are stored in non-volatile memory until the
next calibration adjustment is performed (non-volatile memory does not
change when power has been off or after a remote interface reset).
Agilent Calibration Services
When your function generator is due for calibration, contact your local
Agilent Service Center for a low-cost recalibration. The 33120A Function
Generator is supported on automated calibration systems which allow
Agilent to provide this service at competitive prices. Calibrations to
MIL-STD-45662 are also available at competitive prices.
4
Calibration Interval
The function generator should be calibrated on a regular interval
determined by the measurement accuracy requirements of your
application. A 1- or 2-year interval is adequate for most applications.
Agilent does not recommend extending calibration intervals beyond
two years for any application.
Whatever calibration interval you select, Agilent recommends that complete
re-adjustment should always be performed at the calibration interval.
This will increase your confidence that the 33120A will remain within
specification for the next calibration interval. This criteria for re-adjustment
provides the best long-term stability. Performance data measured using this
method can be used to extend future calibration intervals.
Time Required for Calibration
The 33120A can be automatically calibrated under computer control.
With computer control you can perform the complete calibration
procedure and performance verification tests in less than 15 minutes.
Manual calibrations using the recommended test equipment will take
approximately 45 minutes.
51
Chapter 4 Calibration Procedures
Automating Calibration Procedures
Automating Calibration Procedures
You can automate the complete verification and adjustment procedures
outlined in this chapter if you have access to programmable test
equipment. You can program the instrument configurations specified for
each test over the remote interface. You can then enter readback
verification data into a test program and compare the results to the
appropriate test limit values.
You can also enter calibration constants from the remote interface.
Remote operation is similar to the local front-panel procedure. You can
use a computer to perform the adjustment by first selecting the required
setup. The calibration value is sent to the function generator and then
the calibration is initiated over the remote interface. The function
generator must be unsecured prior to initiating the calibration procedure.
For further detailing on programming the function generator, see
chapters 3 and 4 in the Agilent 33120A User’s Guide.
Recommended Test Equipment
The test equipment recommended for the performance verification and
adjustment procedures is listed below. If the exact instrument is not
available, use the accuracy requirements shown to select substitute
calibration standards.
Instrument
50 W feedthrough load
6 1/2 digit Digital
Multimeter (DMM)
Thermal Voltage Converter
(50 W termination type)
or
Power Meter
or
Wideband ACrms Meter
Frequency Meter
Oscilloscope
Spectrum Analyzer
*
52
Requirements
Recommended Model
50 W – 0.1 W
Q,P,O,T
20 Vdc – 0.01%
Integrating ACrms
10 Vacrms – 0.1%
Agilent 34401A
1kHz to 15 MHz
3 Volt
100 kHz to 15 MHz
1 VAC rms – 0.5%
1 kHz to 20 MHz
Use*
Agilent E4418A with
Agilent 8482A
and 20 dB attenuator
—
Q,P,T
Q,P
1 ppm accuracy
Agilent 53131A
Q,P,T
100 MHz
Agilent 54624A
T
Response to 90 MHz
Agilent 8560EC
O
Q = Quick Verification
P = Performance Verification Tests
O= Optional Verification Tests
T = Troubleshooting
Chapter 4 Calibration Procedures
Test Considerations
Test Considerations
To ensure proper instrument operation, verify that you have selected the
correct power line voltage prior to attempting any test procedure in this
chapter. See page 22 in chapter 2 for more information.
For optimum performance, all test procedures should comply with the
following recommendations:
œ Verify the function generator is set to the default power on state
(power on default). A procedure is given on page 41.
œ Make sure that the calibration ambient temperature is stable and
between 18 •C and 28 •C.
œ Make sure ambient relative humidity is less than 80%.
œ Allow a 1-hour warm-up period before verification or adjustment.
4
œ Use only RG-58 or equivalent 50W cable.
œ Keep cables as short as possible, consistent with the impedance
requirements.
53
Chapter 4 Calibration Procedures
Performance Verification Tests
Performance Verification Tests
The performance verification tests use the function generator’s
specifications listed in chapter 1, “Specifications,” starting on page 13.
You can perform four different levels of performance verification tests:
œ Self-Test A series of internal verification tests that give a high
confidence that the function generator is operational.
Q
œ Quick Verification A combination of the internal self-tests and
selected verification tests.
P
œ Performance Verification Tests An extensive set of tests that are
recommended as an acceptance test when you first receive the function
generator or after performing adjustments.
O
œ Optional Verification Tests Tests not performed with every
calibration. These tests can can be used to verify additional instrument
specifications following repairs to specific circuits.
Self-Test
A brief power-on self-test occurs automatically whenever you turn on the
function generator. This limited test assures that the function generator
is capable of operation.
To perform a complete self-test hold down the Shift key as you press the
Power switch to turn on the function generator; hold down the key for
more than 5 seconds (a complete description of these tests can be found in
chapter 6). The function generator will automatically perform the
complete self-test procedure when you release the key. The self-test will
complete in approximately 5 seconds.
You can perform many tests individually (or all tests at once) using the
TEST command in the SYS MENU. You can also perform a self-test from
the remote interface (see chapter 3 in the Agilent 33120A User’s Guide).
œ If the self-test is successful, “PASS” is displayed on the front panel.
œ If the self-test fails, “FAIL” is displayed and the ERROR annunciator
turns on. If repair is required, see chapter 6, “Service,” for further details.
œ If all tests pass, you have a high confidence (90%) that the function
generator is operational.
54
Chapter 4 Calibration Procedures
Performance Verification Tests
Quick Performance Check
The quick performance check is a combination of internal self-test and an
abbreviated performance test (specified by the letter Q in the performance
verification tests). This test provides a simple method to achieve high
confidence in the function generator’s ability to functionally operate and
meet specifications. These tests represent the absolute minimum set of
performance checks recommended following any service activity.
Auditing the function generator’s performance for the quick check points
(designated by a Q) verifies performance for “normal” accuracy drift
mechanisms. This test does not check for abnormal component failures.
To perform the quick performance check, do the following:
œ Set the function generator to the default power on state (power on default).
A procedure is given on page 41.
œ Perform a complete self-test. A procedure is given on page 21.
4
œ Perform only the performance verification tests indicated with
the letter Q.
If the function generator fails the quick performance check, adjustment or
repair is required.
Performance Verification Tests
The performance verification tests are recommended as acceptance tests
when you first receive the function generator. The acceptance test results
should be compared against the 1 year test limits. After acceptance, you
should repeat the performance verification tests at every calibration interval.
If the function generator fails performance verification, adjustment or
repair is required.
55
Chapter 4 Calibration Procedures
Frequency Verification
Frequency Verification
This test verifies the frequency accuracy of the two sources in the
function generator. All output frequencies are derived from a single
generated frequency, and only one frequency point is checked.
The second test verifies the burst rate frequency.
Set the function generator for each output indicated in the table below.
Use a frequency meter to measure the output frequency. Compare the
measured results to the test limits shown in the table. This is a 50W
output termination test.
Agilent 33120A
Measurement
Function
OUT 1
TERM
Q
Sine wave
50 W
3.5 Vrms 1.00 kHz
Q
Square wave
50 W
3.5 Vrms 1.00 kHz 500 Hz 1 CYC
Ampl
Freq
BURST BURST
RATE
CNT
—
—
Nominal
Error
1.00 kHz
– 0.02 Hz
500 Hz
– 5 Hz
Function Gain and Linearity Verification
This test verifies the output amplitude accuracy specification for
sine wave, triangle wave, ramp, and square wave outputs.
Set the function generator for each output indicated in the table below.
Use a DMM to measure the function generator ACrms output voltage.
Compare the measured results to the test limits shown in the table.
This is a HIGH Z output termination test.
Agilent 33120A
Function
1
Measurement
Ampl
Freq
Nominal
Error
Sine wave
HIGH Z
7.0 Vrms
1.0 kHz
7.0 Vrms
– 0.07 Vrms
Sine wave
HIGH Z
5.7 Vrms
1.0 kHz
5.7 Vrms
– 0.057 Vrms
Triangle wave
HIGH Z
5.7 Vrms
100 Hz
5.7 Vrms
– 0.057 Vrms
Ramp wave
HIGH Z
5.7 Vrms
100 Hz
5.7 Vrms
– 0.057 Vrms
Square wave
HIGH Z
10.0 Vrms
100 Hz
10.0 Vrms
– 0.1 Vrms
Square wave
HIGH Z
8.0 Vrms
100 Hz
8.0 Vrms
– 0.08 Vrms
Q
Q
OUT TERM
1
Output termination set using front panel controls. HIGH Z assumes no load on
output. 50W assumes a 50W – 0.1W load on output.
56
Chapter 4 Calibration Procedures
DC Function Offset Verification
DC Function Offset Verification
This test verifies the DC offset and DC output specifications.
Set the function generator for each output indicated in the table below.
Use a DMM to measure the function generator dcV output. Compare the
measured results to the test limits shown in the table. This is a HIGH Z
output termination test.
Agilent 33120A
Function
Q
OUT TERM
1
Measurement
Ampl
Nominal
Error
DC Volts
HIGH Z
10.0 Vdc
10.0 Vdc
– 0.20 Vdc
DC Volts
HIGH Z
-10.0 Vdc
-10.0 Vdc
– 0.20 Vdc
4
AC Amplitude Verification
This procedure is used to check the output amplitude calibration of the
function generator. Verification checks are performed to check the
accuracy of the pre-attenuator and post attenuator. Make sure you have
read “Test Considerations” on page 53.
Set the function generator for each output indicated in the table on the
next page. Use a DMM to measure the ACrms output voltage of the
function generator. Compare the measured results to the test limits
shown in the table. This is a HIGH Z output termination test.
1
Output termination set using front panel controls. HIGH Z assumes no load on
output. 50W assumes a 50W –0.1W load on output.
57
Chapter 4 Calibration Procedures
AC Amplitude Verification
Agilent 33120A
Function
Q
Q
Q
Q
OUT TERM
1
Measurement
Ampl
Freq
Nominal
Error
Sine wave
HIGH Z
7.0 Vrms
1.00 kHz
7.0 Vrms
– 0.070 Vrms
Sine wave
HIGH Z
5.7 Vrms
1.00 kHz
5.7 Vrms
– 0.057 Vrms
Sine wave
HIGH Z
5.5 Vrms
1.00 kHz
5.5 Vrms
– 0.055 Vrms
Sine wave
HIGH Z
4.4 Vrms
1.00 kHz
4.4 Vrms
– 0.044 Vrms
Sine wave
HIGH Z
3.5 Vrms
1.00 kHz
3.5 Vrms
– 0.035 Vrms
Sine wave
HIGH Z
2.8 Vrms
1.00 kHz
2.8 Vrms
– 0.028 Vrms
Sine wave
HIGH Z
2.2 Vrms
1.00 kHz
2.2 Vrms
– 0.022 Vrms
Sine wave
HIGH Z
1.7 Vrms
1.00 kHz
1.7 Vrms
– 0.017 Vrms
Sine wave
HIGH Z
1.4 Vrms
1.00 kHz
1.4Vrms
– 0.014 Vrms
Sine wave
HIGH Z
1.1 Vrms
1.00 kHz
1.1 Vrms
– 0.011 Vrms
Sine wave
HIGH Z
0.88 Vrms
1.00 kHz
0.88 Vrms
– 0.0088 Vrms
Sine wave
HIGH Z
0.70 Vrms
1.00 kHz
0.70 Vrms
– 0.0070 Vrms
Sine wave
HIGH Z
0.55 Vrms
1.00 kHz
0.55 Vrms
– 0.0055 Vrms
Sine wave
HIGH Z
0.44 Vrms
1.00 kHz
0.44 Vrms
– 0.0044 Vrms
Sine wave
HIGH Z
0.35 Vrms
1.00 kHz
0.35 Vrms
– 0.0035 Vrms
Sine wave
HIGH Z
0.28 Vrms
1.00 kHz
0.28 Vrms
– 0.0028 Vrms
Sine wave
HIGH Z
0.22 Vrms
1.00 kHz
0.22 Vrms
– 0.0022 Vrms
Sine wave
HIGH Z
0.17 Vrms
1.00 kHz
0.17 Vrms
– 0.0017 Vrms
Sine wave
HIGH Z
0.14 Vrms
1.00 kHz
0.14 Vrms
– 0.0014 Vrms
Sine wave
HIGH Z
0.11 Vrms
1.00 kHz
0.11 Vrms
– 0.0011 Vrms
Sine wave
HIGH Z
0.088 Vrms
1.00 kHz
0.088Vrms
– 0.00088 Vrms
Sine wave
HIGH Z
0.070 Vrms
1.00 kHz
0.070 Vrms
– 0.00070 Vrms
Sine wave
HIGH Z
0.055 Vrms
1.00 kHz
0.055 Vrms
– 0.00055 Vrms
Sine wave
HIGH Z
0.044 Vrms
1.00 kHz
0.044 Vrms
– 0.00044 Vrms
Sine wave
HIGH Z
0.036 Vrms
1.00 kHz
0.036 Vrms
– 0.00036 Vrms
1
Output termination set using front panel controls. HIGH Z assumes no load on
output. 50W assumes a 50W – 0.1W load on output.
58
Chapter 4 Calibration Procedures
AC Amplitude Verification
Install the 50W feedthrough load between the DMM and the function
generator output. Set the function generator for each output indicated in
the table on the next page. Use a DMM to measure the ACrms output
voltage of the function generator. Compare the measured results to the
test limits shown in the table. This is a 50W output termination test.
Agilent 33120A
Q
Q
Q
Measurement
Function
OUT TERM 1
Ampl
Freq
Nominal
Error
Sine wave
50 W
3.5 Vrms
1.0000 kHz
3.5 Vrms
– 0.035 Vrms
Sine wave
50 W
2.8 Vrms
1.0000 kHz
2.8 Vrms
– 0.028 Vrms
Sine wave
50 W
2.2 Vrms
1.0000 kHz
2.2 Vrms
– 0.022 Vrms
Sine wave
50 W
1.7 Vrms
1.0000 kHz
1.7 Vrms
– 0.017 Vrms
Sine wave
50 W
1.4Vrms
1.0000 kHz
1.4Vrms
– 0.014 Vrms
Sine wave
50 W
1.1 Vrms
1.0000 kHz
1.1 Vrms
– 0.011 Vrms
Sine wave
50 W
0.88 Vrms
1.0000 kHz
0.88 Vrms
– 0.0088 Vrms
Sine wave
50 W
0.70 Vrms
1.0000 kHz
0.70 Vrms
– 0.0070 Vrms
Sine wave
50 W
0.55 Vrms
1.0000 kHz
0.55 Vrms
– 0.0055 Vrms
Sine wave
50 W
0.44 Vrms
1.0000 kHz
0.44 Vrms
– 0.0044 Vrms
Sine wave
50 W
0.35 Vrms
1.0000 kHz
0.35 Vrms
– 0.0035 Vrms
Sine wave
50 W
0.28 Vrms
1.0000 kHz
0.28 Vrms
– 0.0028 Vrms
Sine wave
50 W
0.22 Vrms
1.0000 kHz
0.22 Vrms
– 0.0022 Vrms
Sine wave
50 W
0.17 Vrms
1.0000 kHz
0.17 Vrms
– 0.0017 Vrms
Sine wave
50 W
0.14 Vrms
1.0000 kHz
0.14 Vrms
– 0.0014 Vrms
Sine wave
50 W
0.11 Vrms
1.0000 kHz
0.11 Vrms
– 0.0011 Vrms
Sine wave
50 W
0.088Vrms
1.0000 kHz
0.088Vrms
– 0.00088 Vrms
Sine wave
50 W
0.070 Vrms
1.0000 kHz
0.070 Vrms
– 0.00070 Vrms
Sine wave
50 W
0.055 Vrms
1.0000 kHz
0.055 Vrms
– 0.00055 Vrms
Sine wave
50 W
0.044 Vrms
1.0000 kHz
0.044 Vrms
– 0.00044 Vrms
Sine wave
50 W
0.035 Vrms
1.0000 kHz
0.035 Vrms
– 0.00035 Vrms
Sine wave
50 W
0.028 Vrms
1.0000 kHz
0.028 Vrms
– 0.00028 Vrms
Sine wave
50 W
0.022 Vrms
1.0000 kHz
0.022 Vrms
– 0.00022 Vrms
Sine wave
50 W
0.018 Vrms
1.0000 kHz
0.018 Vrms
– 0.00018 Vrms
1
Output termination set using front panel controls. HIGH Z assumes no load on
output. 50W assumes a 50W – 0.1W load on output.
59
4
Chapter 4 Calibration Procedures
Amplitude Flatness Verification
Amplitude Flatness Verification
This test verifies the output amplitude flatness specification at selected
frequencies. If you use a TVC (recommended) or a wide band ACrms
voltmeter (with a 50W feed through load), perform this procedure as
described. If you are using a measurement device that requires a transfer
measurement (for example, a power meter), make the transfer in the
reference measurement at 100 kHz.
Set the function generator to the first output indicated in the table below
and make a reference measurement. Select each function generator output
in the table below and adjust the function generator output amplitude until
the measured output is at the reference measurement. Compare the
amplitude level set on the front panel to the test limits shown in the table.
This test is a 50W output termination test.
Agilent 33120A
Measurement
1
Q
Q
Q
1
Function
OUT
TERM
Ampl
Freq
Nominal
Sine wave
50 W
3.0 Vrms
1.00 kHz
<reference>
Sine wave
50 W
3.0 Vrms
100.00 kHz
<reference>
– 0.03 Vrms
Sine wave
50 W
3.0 Vrms
500.00 kHz
<reference>
– 0.045 Vrms
Sine wave
50 W
3.0 Vrms
1.00 MHz
<reference>
– 0.045 Vrms
Sine wave
50 W
3.0 Vrms
3.00 MHz
<reference>
– 0.06 Vrms
Sine wave
50 W
3.0 Vrms
5.00 MHz
<reference>
– 0.06 Vrms
Sine wave
50 W
3.0 Vrms
7.00 MHz
<reference>
– 0.06 Vrms
Sine wave
50 W
3.0 Vrms
9.00 MHz
<reference>
– 0.06 Vrms
Sine wave
50 W
3.0 Vrms
11.00 MHz
<reference>
– 0.06 Vrms
Sine wave
50 W
3.0 Vrms
13.00 MHz
<reference>
– 0.06 Vrms
Sine wave
50 W
3.0 Vrms
15.00 MHz
<reference>
– 0.06 Vrms
Error
Output termination set using front panel controls. HIGH Z assumes no load on
output. 50W assumes a 50W –0.1W load on output.
60
Chapter 4 Calibration Procedures
AM Modulation Depth Verification
AM Modulation Depth Verification
This test verifies the modulation depth specification.
Select each function generator output in the table below. Use a DMM to
measure the function generator ACrms output voltage. Compare the
measured results to the test limits shown in the table. This is a HIGH Z
output termination test.
Agilent 33120A
Measurement
AM Modulation
1
Q
OUT
TERM
Freq
Shape
Freq
Depth
Nominal
Error
Sine wave HIGH Z 1.0 Vrms
1.00 kHz
Sinewave
100 Hz
0%
0.50 Vrms
– 0.005 Vrms
Sine wave HIGH Z 1.0 Vrms
1.00 kHz
Sinewave
100 Hz
100%
Function
Ampl
0.61 Vrms – 0.0061 Vrms
4
1
Output termination set using front panel controls. HIGH Z assumes no load on
output. 50W assumes a 50W – 0.1W load on output.
61
Chapter 4 Calibration Procedures
Optional Performance Verification Tests
Optional Performance Verification Tests
These tests are not intended to be performed with every calibration.
They are provided as an aid for verifying additional instrument specifications.
Square Wave Duty Cycle Verification
This test verifies the duty cycle specification of the squarewave output.
Select each function generator output in the table below. Use an integrating
DMM to measure the Vdc output of the function generator. Compare the
measured results to the test limits shown in the table. This is a HIGH Z
output termination test.
Agilent 33120A
Function
OUT 1
TERM
Ampl
Square wave
HIGH Z
Square wave
Square wave
Measurement
Freq
Duty
Cycle
Nominal
Error
1.0 Vrms
300.00 Hz
50%
0.00 Vdc
– 0.020 Vdc
HIGH Z
1.0 Vrms
300.00 Hz
25%
- 0.50 Vdc
– 0.020 Vdc
HIGH Z
1.0 Vrms
300.00 Hz
75%
+ 0.50 Vdc
– 0.020 Vdc
The DMM used for this test must be an integrating multimeter. If the
first step does not measure 0 Vdc, use an oscilloscope for this test.
Do not use an auto-ranging function on the DMM for this test. Fix the
DMM measurement range at 10 Vdc.
1
Output termination set using front panel controls. HIGH Z assumes no load on
output. 50W assumes a 50W – 0.1W load on output.
62
Chapter 4 Calibration Procedures
Optional Performance Verification Tests
Distortion Verification
This test checks the Harmonic Distortion at selected frequencies and
harmonics. This test requires the use of a spectrum analyzer with
dynamic range, frequency range, and resolution bandwidth adequate for
the measurement.
Select each function generator output in the table below. Use a spectrum
analyzer connected to the function generator output. Set the fundamental
frequency reference to 0 dB and measure the 2nd through 5th harmonic
frequencies relative to this reference. This test is a 50W output
termination test.
Agilent 33120A
Measurement
harmonic
Function
OUT 1
TERM
Ampl
Freq
Fundamental
2nd
3rd
Sine wave
50 W
1.1 Vrms
20.00 kHz
reference
40 kHz
60 kHz
80 kHz 100 kHz
< 70 dB
Sine wave
50 W
1.1 Vrms 100.00 kHz
reference
200 kHz 300 kHz 400 kHz 500 kHz
< 60 dB
Sine wave
50 W
1.1 Vrms
1.00 MHz
reference
2 MHz
5 MHz
< 45 dB
Sine wave
50 W
1.1 Vrms 15.00 MHz
reference
30 MHz 45 MHz 60 MHz 75 MHz
< 35 dB
1
3 MHz
4th
4 MHz
5th
Value below
reference
Output termination set using front panel controls. HIGH Z assumes no load on
output. 50W assumes a 50W – 0.1W load on output.
63
4
Chapter 4 Calibration Procedures
Calibration Security Code
Calibration Security Code
This feature allows you to enter a security code (electronic key) to prevent
accidental or unauthorized calibrations of the function generator.
When you first receive your function generator, it is secured. Before you
can adjust calibration constants you must unsecure the function generator
by entering the correct security code. A procedure to unsecure the
function generator is given on page 47.
œ The security code is set to “HP033120” when the function generator is
shipped from the factory. The security code is stored in non-volatile
memory, and does not change when power has been off or after a remote
interface reset.
œ To secure the function generator from the remote interface, the security
code may contain up to 12 alphanumeric characters as shown below.
The first character must be a letter, but the remaining characters can be
letters or numbers. You do not have to use all 12 characters but the first
character must always be a letter.
A _ _ _ _ _ _ _ _ _ _ _
(12 characters)
œ To secure the function generator from the remote interface but allow it to
be unsecured from the front panel, use the eight-character format shown
below. The first two characters must be “HP” and the remaining
characters must be numbers. Only the last six characters are recognized
from the front panel, but all eight characters are required. (To unsecure
the function generator from the front panel, omit the “HP” and enter the
remaining numbers.)
H P _ _ _ _ _ _
(8 characters)
œ If you forget your security code, you can disable the security feature by
adding a jumper inside the function generator, and then entering a
new code. See the procedure on the following page.
64
Chapter 4 Calibration Procedures
Calibration Security Code
To Unsecure the Function Generator Without the Security Code
To unsecure the function generator without the correct security code,
follow the steps below. A procedure to unsecure the function generator is
given on page 47. Also see “Electrostatic Discharge (ESD) Precautions” in
chapter 6 before beginning this procedure.
WARNING
SHOCK HAZARD. Only service-trained personnel who are aware
of the hazards involved should remove the instrument covers.
The procedures in this section require that you connect the power
cord to the instrument with the covers removed. To avoid
electrical shock and personal injury, be careful not to touch the
power-line connections.
1 Disconnect the power cord and all input connections (front and rear terminals).
2 Remove the instrument cover. Refer to the disassembly drawing on page 130.
4
3 Connect the power cord and turn on the function generator.
4 Apply a short between the two exposed metal pads on JM101 (located
near U106 and U205) as shown in the figure below.
5 While maintaining the short, enter any unsecure code. The function
generator is now unsecured.
6 Remove the short at JM101.
7 Turn off and reassemble the function generator.
8 The function generator is now unsecured and you can enter a new
security code. Be sure you take note of the new security code.
65
Chapter 4 Calibration Procedures
Calibration Count
Calibration Count
The calibration count feature provides an independent “serialization” of
your calibrations. You can determine the number of times that your
function generator has been calibrated. By monitoring the calibration
count, you can determine whether an unauthorized calibration has been
performed. Since the value increments by one for each calibration, a
complete calibration increases the value by approximately 85 counts.
œ The calibration count is stored in non-volatile memory and does not
change when power has been off or after a remote interface reset.
Your function generator was calibrated before it left the factory.
When you receive your function generator, read the calibration count
to determine its value.
œ The calibration count increments up to a maximum of 32,767 after which
it wraps around to 0. There is no way provided to program or reset the
calibration count. It is an independent electronic calibration
“serialization” value.
Calibration Message
You can use the calibration message feature to record calibration
information about your function generator. For example, you can store
such information as the last calibration date, the next calibration due
date, the function generator’s serial number, or even the name and phone
number of the person to contact for a new calibration.
You can record information in the calibration message only from the
remote interface. You can read the message from either the front-panel
menu or the remote interface.
œ The calibration message may contain up to 40 characters. The function
generator can display up to 11 characters of the message on the front
panel; any additional characters are truncated.
œ The calibration message is stored in non-volatile memory, and does not
change when power has been off or after a remote interface reset.
66
Chapter 4 Calibration Procedures
General Calibration/Adjustment Procedure
General Calibration/Adjustment Procedure
The adjustment procedures described in chapter 4 use the CAL MENU to
generate and set internal calibration constants. The general menu
procedure is the same for all calibration setups. The following example
demonstrates making the Frequency and Burst Rate adjustments.
Shift
1 Turn on the menu.
A: MOD MENU
Menu On/Off
<
2 Move across to the CAL MENU choice on this level.
1
F: CAL MENU
¿
4
3 Move down a level to the UNSECURED command.
1: UNSECURED
If the display shows SECURED, you will have to unsecure the function
generator to perform the calibration procedures. A procedure is given on
page 47.
>
4
Move across to the CALIBRATE choice.
1
2: CALIBRATE
¿
5 Move down one level.
The display indicates the calibration setup number. You can change this
number to perform individual specification adjustments.
SETUP 00
Enter
6 Begin the Frequency and Burst Rate adjustment procedure.
67
Chapter 4 Calibration Procedures
General Calibration/Adjustment Procedure
<
^
>
¿
7 Move the flashing cursor over the digit to be edited.
1
8 Change the value in the display to match the measured frequency.
1.000,0040KHz
Enter
9 Calculate and save the new value.
CALIBRATING
10 Perform the next adjustment procedure.
The setup number and function generator output is automatically set for
the next adjustment procedure.
SETUP ^01
You will press ENTER twice for each calibration step, once to select
the setup (as described in step 6) and once to enter the adjustment
(as described in step 9).
1
You can also use the knob to scroll left or right through the choices on each level of
the menu
68
Chapter 4 Calibration Procedures
Aborting a Calibration in Progress
Aborting a Calibration in Progress
Sometimes it may be necessary to abort a calibration after the procedure
has already been initiated. You can abort a calibration at any time by
pressing any front-panel key (except Shift-Cancel ). When performing a
calibration from the remote interface, you can abort a calibration by
issuing a remote interface device clear message or by pressing the
front-panel LOCAL key.
Frequency and Burst Rate Adjustment
The function generator stores two calibration constants related to
frequency and burst rate output. The constants are calculated from the
adjustment value entered and are stored at the completion of each setup.
1 Use a frequency meter to measure the function generator output
frequency for each setup in the following table. These adjustments use
a 50W output termination.
4
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
00 *
1.00 kHz
10 Vpp
Adjustment for main frequency
generator, sine wave output
01
500 Hz
10 Vpp
Adjustment for burst rate timing,
pulse output.
* A new calibration (SETUP 86 – Rev 4.0) has been added as an alternative to SETUP 00.
The new calibration outputs a 10 MHz sine wave, rather than the 1 kHz signal used for
SETUP 00. The new calibration reduces slew rate dependent errors in the frequency
measurement and is especially important when calibrating the Phase-Lock Assembly
(Option 001). Note that either setup is sufficient to calibrate the carrier frequency and
you don’t need to perform both.
2 Use the CALIBRATE menu to adjust the displayed frequency at each
setup to match the measured frequency and enter the value.
3 Perform the Frequency Verification procedures on page 56.
69
Chapter 4 Calibration Procedures
Function Gain and Linearity Adjustment
Function Gain and Linearity Adjustment
The function generator stores six calibration constants related to function
gain and linearity. The constants are calculated from the adjustment
value entered. If the calibration procedure is aborted before all setup steps
have been completed, no calibration constants are stored.
1 Use a DMM to measure the function generator ACrms output voltage for
each setup in the following table. These adjustments use a HIGH Z
output termination.
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
02
1 kHz
7.07 V rms
Adjustment for sine wave gain.
03
1 kHz
5.6 V rms
Adjustment for amplitude linearity.
04
100 Hz
5.6 V rms
Adjustment for triangle wave gain.
05
100 Hz
5.6 V rms
Adjustment for ramp gain.
06
100 Hz
10.0 V rms
Adjustment for square wave gain.
07
100 Hz
1.1 Vrms
Adjustment for square wave linearity.
2 Use the CALIBRATE menu to adjust the displayed amplitude at each
setup to match the measured amplitude and enter the value.
3 Perform the Function Gain and Linearity Verification procedures on page 56.
AC Amplitude Adjustment (High-Z)
The function generator stores twenty-two calibration constants related to
HIGH Z output, and sixteen calibration constants related to 50W output.
The constants are calculated from the adjustment value entered. The calibration constants are stored following completion of setup 22 (HIGH Z
output) and the calibration procedure may be aborted after that point.
No calibration constants are stored if the procedures are aborted at any
other setup.
1 Use a DMM to measure the function generator ACrms output voltage for
each setup in the following table. These adjustments use a HIGH Z
output termination.
70
Chapter 4 Calibration Procedures
AC Amplitude Adjustment (High-Z)
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
Adjustment for:
8
1 kHz
5.5 V rms
2 dB Output Attenuator
9
1 kHz
4.4 V rms
4 dB Output Attenuator
10
1 kHz
3.5 V rms
6 dB Output Attenuator
11
1 kHz
2.8 V rms
8 dB Output Attenuator
12
1 kHz
2.2 V rms
10 dB Output Attenuator
13
1 kHz
1.7 V rms
12 dB Output Attenuator
14
1 kHz
1.4 V rms
14 dB Output Attenuator
15
1 kHz
1.1 V rms
16 dB Output Attenuator
16
1 kHz
0.88 V rms
18 dB Output Attenuator
17
1 kHz
0.70 V rms
20 dB Output Attenuator
18
1 kHz
0.55 V rms
22 dB Output Attenuator
19
1 kHz
0.44 V rms
24 dB Output Attenuator
20
1 kHz
0.35 V rms
26 dB Output Attenuator
21
1 kHz
0.28 V rms
28 dB Output Attenuator
22
1 kHz
0.22 V rms
30 dB Output Attenuator
23
1 kHz
5.5 V rms
2 dB Pre-attenuator
24
1 kHz
4.4 V rms
4 dB Pre-attenuator
25
1 kHz
3.5 V rms
6 dB Pre-attenuator
26
1 kHz
2.8 V rms
8 dB Pre-attenuator
27
1 kHz
2.2V rms
10 dB Pre-attenuator
28
1 kHz
1.7 V rms
12 dB Pre-attenuator
29
1 kHz
1.4 Vrms
14 dB Pre-attenuator
4
2 Use the CALIBRATE menu to adjust the displayed amplitude at each
setup to match the measured amplitude and enter the value.
3 Perform the AC Amplitude Verification procedures on page 57.
71
Chapter 4 Calibration Procedures
Modulation Adjustment
Modulation Adjustment
The function generator stores three calibration constants related to
amplitude modulation depth. The constants are calculated from the
adjustment value entered. If the calibration procedure is aborted before
all setup steps have been completed, no calibration constants are stored.
1 Use a DMM to measure the function generator ACrms output voltage for
each setup in the following table. These adjustments use a HIGH Z
output termination.
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
30
1 kHz
3.5 Vrms
0% modulation depth.
Adjustment for:
31
1 kHz
0.707 Vrms
50% modulation depth.
32
1 kHz
6.36 Vrms
100% modulation depth.
2 Use the CALIBRATE menu to adjust the displayed amplitude at each
setup to match the measured amplitude and enter the value.
3 Perform the AM Modulation Depth Verification procedures on page 61.
NEW CALIBRATION: A new calibration (SETUP 85 – Rev 4.0) has
been added to eliminate a small residual error in the AM amplitude
system which could potentially cause a failure of the AM amplitude
verification. The new calibration operates just like the other AM
calibrations (SETUP 30, 31, 32) in that the external measurement is
AC Vrms with no load. The new calibration is not allowed until the
other AM gain calibrations (SETUP 30, 31, 32) are performed.
The new algorithm is designed such that the calibration should not be
required again once the function generator has been calibrated at the
factory. However, if you change any critical analog components which
determine amplitude in AM modulation, you should perform the
calibration again.
72
Chapter 4 Calibration Procedures
AC Amplitude Adjustment (50W)
AC Amplitude Adjustment (50W)
1 The function generator stores 16 calibration constants related to 50W
output. The constants are calculated from the adjustment value entered.
The calibration constants are stored following completion of setup 49 and
the calibration procedure may be aborted after that point. No calibration
constants are stored if the procedures are aborted at any other setup.
2 Use the DMM to measure the resistance of a 50W feedthrough load.
Record the measurement for step 3. You can measure the load and cable
resistance (recommended procedure) or just the load as shown below.
4
3 Enter the following setup and use the calibrate menu to enter the
measured value of the 50W feedthrough load (and cable). This number
will be used to calculate the 50W output amplitude calibration constants.
Nominal Input
SETUP
LOAD Z
33
50 W
Enter measured value of load.
Once the value of the 50W load and cable are entered, use the SAME
load and cable for all 50W tests.
73
Chapter 4 Calibration Procedures
AC Amplitude Adjustment (50W)
4 Use the DMM to measure the function generator ACrms output voltage
for each setup in the table on the next page. These adjustments use the
50W load and cable measured in step 2 and connected as shown below.
74
Chapter 4 Calibration Procedures
AC Amplitude Adjustment (50W)
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
Adjustment for:
34
1 kHz
3.5 Vrms
0 dB Output Attenuator
35
1 kHz
2.8 Vrms
2 dB Output Attenuator
36
1 kHz
2.23 Vrms
4 dB Output Attenuator
37
1 kHz
1.77 Vrms
6 dB Output Attenuator
38
1 kHz
1.41 Vrms
8 dB Output Attenuator
39
1 kHz
1.12 Vrms
10 dB Output Attenuator
40
1 kHz
.887 Vrms
12 dB Output Attenuator
41
1 kHz
.704 Vrms
14 dB Output Attenuator
42
1 kHz
.559 Vrms
16 dB Output Attenuator
43
1 kHz
.442 Vrms
18 dB Output Attenuator
44
1 kHz
.350 Vrms
20 dB Output Attenuator
44
1 kHz
.281 Vrms
22 dB Output Attenuator
46
1 kHz
.223 Vrms
24 dB Output Attenuator
47
1 kHz
.177 Vrms
26 dB Output Attenuator
48
1 kHz
.141 Vrms
28 dB Output Attenuator
49
1 kHz
.112 Vrms
30 dB Output Attenuator
4
5 Use the CALIBRATE menu to adjust the displayed amplitude at each
setup to match the measured amplitude and enter the value.
6 Perform the AC Amplitude Verification procedures beginning on page 57.
75
Chapter 4 Calibration Procedures
DC Output Adjustment
DC Output Adjustment
The function generator stores nine calibration constants related to
DC volts output. The constants are calculated from the adjustment value
entered. The calibration constants are stored following completion of
setup 59. No calibration constants are stored if the procedures are aborted
at any other setup.
1 Use a DMM to measure the function generator dcV output voltage for
each setup in the following table. These adjustments use a HIGH Z
output termination.
Nominal Output
SETUP
DC Volts
Adjustment for:
50
- 8.0 Vdc
Negative offset gain
51
8.0 Vdc
Positive offset gain
52
0.0 Vdc
AM offset
53
0.0 Vdc
2 dB Pre-attenuator offset.
54
0.0 Vdc
4 dB Pre-attenuator offset.
55
0.0 Vdc
6 dB Pre-attenuator offset.
56
0.0 Vdc
8 dB Pre-attenuator offset.
57
0.0 Vdc
10 dB Pre-attenuator offset.
58
0.0 Vdc
12 dB Pre-attenuator offset.
59
0.0 Vdc
14 dB Pre-attenuator offset.
2 Use the CALIBRATE menu to adjust the displayed output voltage at
each setup to match the measured voltage and enter the value.
3 Perform the DC Function Offset Verification procedures on page 57.
76
Chapter 4 Calibration Procedures
Duty Cycle Adjustment
Duty Cycle Adjustment
The function generator stores two calibration constants related to
squarewave offset and two calibration constants related to squarewave
duty cycle. The constants are calculated from the adjustment value
entered. The calibration constants are stored following completion of
setup 63. No calibration constants are stored if the procedures are aborted
at any other setup.
1 Use a DMM to measure the function generator dcV output voltage for
each setup in the following table. These adjustments use a HIGH Z
output termination.
For this test, the DMM must be set to a fixed range capable of measuring
from +10 V to -10 V. Do not use an auto-ranging function for this test.
4
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
60
—
10.0 Vdc
Positive squarewave offset.
61
—
-10.0 Vdc
Negative squarewave offset.
62
300 Hz
0.0 Vdc
50% duty cycle squarewave.
63
300 Hz
5.0 Vdc
75% duty cycle squarewave
2 Use the CALIBRATE menu to adjust the displayed output voltage at
each setup to match the measured voltage and enter the value.
3 Perform the Squarewave Duty Cycle Verification procedures on page 62.
AC Amplitude Flatness Adjustment
The function generator stores eleven calibration constants related to AC
Amplitude Flatness from 1 kHz to 15 MHz. The constants are calculated
from the adjustment value entered and one of two calculation constants
related to the type of measurement device you are using. The calibration
constants are stored following completion of setup 82. No calibration
constants are stored if the procedures are aborted at any other setup.
77
Chapter 4 Calibration Procedures
AC Amplitude Flatness Adjustment
This procedure can be performed with one of three types of measurement
device; a broadband ACrms voltmeter, a power meter, or a thermal
voltage converter. The procedure differs slightly depending upon the type
of measurement device used. These adjustments us a 50W output termination.
1 Use a DMM to measure the ACrms output voltage of the function generator
and enter the measurement value for the setup in the table below.
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
64
1 kHz
3.0 V rms
Reference for:
1 kHz flatness DAC gain
2 a. If you are using a broadband ACrms voltmeter, proceed to step 3.
b. If you are using a power meter capable of measurements at 1 kHz,
use the power meter to measure the function generator output and enter
the value for the setup in the table below. (If your power meter does not
measure to 1 kHz, see the transfer measurement procedure below.)
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
83
1 kHz
3.0 V rms
Reference for:
V rms, dBm
Transfer Measurement Procedure
If you are using a power meter not capable of measurement to 1 kHz,
you can perform the transfer measurement at a different frequency.
For example, the Agilent E4418A Power Meter with the Agilent 8482A
probe and 20 dB attenuator are specified to a low frequency of 100 kHz.
To use this measurement device, perform step 1, then use setup 65 to
obtain a 100 kHz output. Measure the output with the power meter and
record the measured value. Perform setup 83 and enter the recorded
value (not a new measurement). Then, perform step 3 (you will use setup
65 twice). This procedure assumes the output of the function generator is
flat from 1 kHz to 100 kHz.
c. If you are using a Thermal Voltage Converter (TVC), use the TVC to
measure the function generator output and enter the measurement for
the setup in the table below (TVC values entered are in mVdc).
Nominal Output
78
SETUP
FREQUENCY
AMPLITUDE
84
1 kHz
3.0 V rms
Reference for:
Thermal Voltage Converter
Chapter 4 Calibration Procedures
AC Amplitude Flatness Adjustment
3 For each setup in the table below, use the CALIBRATE command to
change the displayed amplitude to match the measured amplitude.
Nominal Output
SETUP
FREQUENCY
AMPLITUDE
Adjustment for:
65
100 kHz
3.0 V rms
100 kHz amplitude flatness
66
500 kHz
3.0 V rms
500 kHz amplitude flatness
67
1 MHz
3.0 V rms
1 MHz amplitude flatness
68
3 MHz
3.0 V rms
3 MHz amplitude flatness
69
5 MHz
3.0 V rms
5 MHz amplitude flatness
70
7 MHz
3.0 V rms
7 MHz amplitude flatness
71
9 MHz
3.0 V rms
9 MHz amplitude flatness
72
10 MHz
3.0 V rms
10 MHz amplitude flatness
73
10.5 MHz
3.0 V rms
10.5 MHz amplitude flatness
74
11 MHz
3.0 V rms
11 MHz amplitude flatness
75
11.5 MHz
3.0 V rms
11.5 MHz amplitude flatness
76
12 MHz
3.0 V rms
12 MHz amplitude flatness
77
12.5 MHz
3.0 V rms
12.5 MHz amplitude flatness
78
13 MHz
3.0 V rms
13 MHz amplitude flatness
79
13.5 MHz
3.0 V rms
13.5 MHz amplitude flatness
80
14 MHz
3.0 V rms
14 MHz amplitude flatness
81
14.5 MHz
3.0 V rms
14.5 MHz amplitude flatness
82
15 MHz
3.0 V rms
15 MHz amplitude flatness
4
4 Perform the Amplitude Flatness Verification procedures on page 60.
Shift
Menu On/Off
Completion of adjustment procedures. Return the function generator
to the normal operating mode.
EXITING
79
Chapter 4 Calibration Procedures
Output Amplifier Adjustment (Optional)
Output Amplifier Adjustment (Optional)
This adjustment procedure should only be performed following repairs to
the Output Amplifier circuitry. The adjustment improves the high frequency
performance of the Output Amplifier.
1 Remove the function generator power and cover as described on page 130.
2 Use a DMM to measure the ACrms voltage across J701 as shown below.
Cable Shield is
Circuit Ground
3 Turn on the function generator.
4 Set the function generator for a 1 kHz, 1V rms, sine wave output.
5 Adjust R710 for a minimum reading on the voltmeter. Typical readings
are less than 0.005 Vrms.
6 Replace the covers as described on page 130.
80
Chapter 4 Calibration Procedures
Error Messages
Error Messages
The following tables are abbreviated lists of function generator’s error
messages. They are intended to include errors which are likely to be
encountered during the procedures described in this chapter. For a more
complete list of error messages and descriptions, see chapter 5 in the
Agilent 33120A User’s Guide.
System Error Messages
Error
Error Message
-330
-350
501
502
Self-test Failed
Too many errors
Isolator UART framing error
Isolator UART overrun error
511
512
513
514
521
522
550
RS-232 framing error
RS-232 overrun error
RS-232 parity error
Command allowed only with RS-232
Input buffer overflow
Output buffer overflow
Command not allowed in Local
4
Self-Test Error Messages
Error
Error Message
601
Front panel does not respond
602
RAM read/write fail
603
Waveform RAM readback failed
604
Modulation RAM readback failed
605
Serial configuration readback failed
606
Waveform ASIC failed
607
SYNC signal detection failure
608
SYNC signal detection failure
625
I/O Processor not responding
626
I/O Processor failed self-test
627
I/O Processor reset; possible low power line voltage
81
Chapter 4 Calibration Procedures
Error Messages
Calibration Error Messages
Error
Error Message
701
702
703
704
705
706
707
708
Cal security disabled by jumper
Cal secured
Invalid secure code
Secure code too long
Cal aborted
Cal value out of range
Cal signal measurement out of range
Flatness cal failed
709
760
850
851
852
853
854
855
Cannot calibrate frequency while externally locked (Option 001)
RAM checksum failure
Cal setup invalid
Negative offset gain cal required (CAL:SETup 50)
Flatness DAC gain cal required (CAL:SETup 64)
AM cal 1 required (CAL:SETup 30)
AM cal 2 required (CAL:SETup 31)
Cal load resistance not specified (CAL:SETup 33)
856
857
858
Square wave positive offset cal required (CAL:SETup 60)
Square wave 50% duty cycle cal required (CAL:SETup 62)
AM cal 3 required (CAL:SETup 32)
82
5
5
Theory of
Operation
Theory of Operation
This chapter is organized to provide descriptions of the circuitry
contained on the schematics shown in chapter 8. A block diagram
overview is provided followed by more detailed descriptions of the
circuitry contained in the schematics chapter.
œ Block Diagram Overview . . . . . . . . . . . . . . . . 85
œ Output Attenuator
. . . . . . . . . . . . . . . . . . . 86
œ Output Amplifier . . . . . . . . . . . . . . . . . . . . 87
œ AM Modulation . . . . . . . . . . . . . . . . . . . . . 89
œ Pre-attenuator . . . . . . . . . . . . . . . . . . . . . . 90
œ Square Wave and Sync . . . . . . . . . . . . . . . . . 90
œ Filters . . . . . . . . . . . . . . . . . . . . . . . . . . 92
œ Waveform DAC/Amplitude Leveling/Waveform RAM . . 93
œ Direct Digital Synthesis (DDS ASIC)
. . . . . . . . . 95
œ System DACs . . . . . . . . . . . . . . . . . . . . . . 96
œ Floating Logic . . . . . . . . . . . . . . . . . . . . . . 97
œ Earth-Referenced Logic . . . . . . . . . . . . . . . . . 98
œ Power Supplies . . . . . . . . . . . . . . . . . . . . . 98
œ Display and Keyboard . . . . . . . . . . . . . . . . . . 100
The self-test procedures are described in chapter 6.
84
Chapter 5 Theory of Operation
Block Diagram Overview
Block Diagram Overview
This discussion pertains to the block diagram shown on page 129.
The function function generator’s circuitry is divided into two major
blocks: the floating section and the earth (ground) reference section.
All signal generation, control, and display functions are contained in
the floating section. This section also contains the function generator’s
main CPU.
The floating section can be viewed in two pieces; the analog signal
conditioning section (System DAC, Filters, Sync, Square wave,
Pre-Attenuator, Output Amp, and Output Attenuator) and the digital
logic section (Floating Logic, Digital Waveform Data Synthesis, and
Waveform DAC).
All signal generation, level control, and modulation functions are
performed in the floating section. The waveform DAC generates two
outputs, normal and inverted, between approximately 800 mVp-p and
1 Vp-p. The DAC outputs are routed through anti-alias low-pass filters to
eliminate higher frequency sampling products. The nominal x10 gain of
the output amplifier, combined with preattenuator and output attenuator
settings, are chosen such that the desired output amplitude is produced.
The ground reference section uses a processor configured as a slave to the
main CPU. This processor establishes external I/O communication with
the main CPU through a bi-directional, optically isolated, serial
communications link. The earth referenced processor controls low-level
GPIB (IEEE-488) and RS-232 interface operation. The ground referenced,
rear panel external trigger input uses a dedicated optical isolator to
couple a trigger signal to the main CPU in the floating section.
Separate power supplies are provided for the floating and ground
reference sections. The front panel operates from the floating section with
its logic common different from the CPU logic common.
85
5
Chapter 5 Theory of Operation
Output Attenuator
Output Attenuator
Block 8 on block diagram page 129; Schematic on page 138.
The Output Attenuator provides 0 to 30 dB of signal attenuation between
the output amplifier section and the output BNC connector. Output signal
levels are controlled by combining coarse amplitude control from the
output attenuator section and pre-attenuator section with fine amplitude
control from the Waveform DAC AMP_CTL signal.
Four switched output attenuator pads are combined to achieve the desired
signal attenuation as shown in the table below. Relays K801 through
K804 either bypass an attenuator pad or select that attenuator. K801
selects a 2 dB attenuator, K802 selects a 4 dB attenuator, K803 selects
a 8 dB attenuator, and K804 selects a 16 dB attenuator. Relays are
sequenced to provide signal attenuation in 6 dB steps. Intermediate
amplitude levels are controlled by selecting 0 dB, 2 dB or 4 dB of signal
attenuation through the pre-attenuator solid state switches in
combination with reducing the output level of the waveform DAC itself.
The AMP_CTL signal provides smoothly varying control of the Waveform
DAC output level over a 0 dB to -2 dB range. This operation is described
further in the Waveform DAC and System DAC discussions.
Output Attenuation
K801
K802
K803
K804
0 dB
6 dB
12 dB
18 dB
24 dB
30 dB
set
reset
set
reset
set
reset
set
reset
reset
set
set
reset
set
set
reset
set
reset
reset
set
set
set
reset
reset
reset
K801 through K804 are latching relays. Their set or reset state is selected
by momentarily pulsing the appropriate coil of the relay. Relay coils are
pulsed with 5 volts for 15 ms through relay drivers U301 and U302.
The main controller, U102, writes data bytes to ASIC U103 which
transmits this data to the relay drivers via the internal 3-wire serial data bus
(SERCLK, SERDAT, and SERSTB) to accomplish the relay state changes.
A 30 MHz filter, composed of L801, C801, and C802, eliminates wideband
noise from the function generator output. The output amplifier and output
attenuators are protected from damage by clamps CR801 and CR802 and
by fuse F801. The function generator is protected from accidental
application of voltages <10 volts for short durations.
86
Chapter 5 Theory of Operation
Output Amplifier
Output Amplifier
Block 7 on block diagram page 129; Schematic on page 137.
The output amplifier drives the function generator’s signal output
through the output attenuator section. The output amplifier exhibits an
approximate 35 MHz bandwidth and 1000 V/ms slew rate. AC signals
originating from the DAC+ and DAC- signal paths are combined at the
input of the amplifier. The output amplifier exhibits a nominal x(-10)
voltage gain from its -AMP_IN input and a nominal x12 voltage gain
from its +AMP_IN input. A dc offset signal, related to the front panel
output offset value, is also summed with the ac signal at the input of the
amplifier. A simplified block diagram of the output amplifier is shown below.
5
87
Chapter 5 Theory of Operation
Output Amplifier
The block diagram shows four basic stages: dc amplifier, input differential
amplifier, gain, and power output. The amplifier’s input differential
amplifier stage and gain stage are symmetrical. The +AMP_IN and
-AMP_IN inputs are both amplified through complementary amplifiers
whose outputs are summed together at the input of the power output
stage. Transistors Q701, Q702, Q704 and Q707 form the complementary
input differential amplifiers. Q708 and Q705 are current sources which
provide bias to the input differential amplifiers. Q709 and Q710 are
emitter follower amplifiers used to couple the respective differential
amplifier outputs to the gain stage transistors Q711 and Q715 which
provide virtually all of the amplifiers open loop gain (~ x1000).
The power output stage is a wideband, class C buffer amplifier. Emitter
followers Q714 and Q716 buffer the gain stage output from loading by the
power output emitter follower transistors Q713 and Q718. Idle current
bias for these power output transistors is set by the ratios of R732, R726
and transistor matching between Q713, Q714 and their equivalents in
the other half of the stage: R734, R727 and Q718, Q716. Transistors Q712
and Q717 are current sources which provide bias to emitter followers
Q714 and Q716 respectively.
The low frequency and dc performance of the amplifier is controlled by
U702. This amplifier is used to sense the dc offset present at the
+AMP_IN and -AMP_IN inputs and servo the output amplifier dc offset
to zero volts; to the limit of U702’s own dc offset performance. U702 also
provides a means to add a desired dc offset value into the output signal
path through the x (-1) gain of the OUT_OFFSET signal.
The output amplifier employs a current feedback technique to set the
closed-loop gain. The emitters of Q701 and Q702 are the virtual summing
node points in the amplifier. Amplifier closed loop gain is controlled
predominately by the following ratios:
2 * ( R740 + R710 ) + R717
( R715 + R716 )
and
2 * ( R740 + R710 ) + R711
( R719 + R720 )
Variable resistor R710 is used to match the gain through the high frequency
feedback path (described above) and the dc feedback path summed
through resistors R705, R706. The feedback signal current is injected into
the amplifier through the emitters of Q701 and Q702 respectively.
88
Chapter 5 Theory of Operation
AM Modulation
AM Modulation
Blocks 3 and 6 on block diagram page 129; Schematics on pages 136 and 133.
Amplitude modulation is performed by analog multiplier U603 combining
the AM_IN and +FUNCTION and -FUNCTION signals. Modulation depths
from 0% to 120% are set by varying the signal at AM_IN.
When the amplitude modulation function is selected, the output of U603
is switched into the +AMP_IN signal path by K602. At the same time,
the -AMP_IN signal path is grounded, cutting the output signal
amplitude in half, to accommodate the more than two times peak signal
levels required by >100% modulation depth.
5
The AM_IN signal is a combination of any external modulation inputs
applied to the rear panel BNC connector and the internally generated
AM signals. The function generator can internally synthesize an 8-bit
modulation wave shape through DAC U313. Data from any standard or
arbitrary wave shape can be used as the modulating wave shape.
Modulating wave shapes are automatically expanded or compressed in
length, as required, to meet the specified modulating frequency setting.
Changes in the function generator output will lag changes in the
modulating frequency because new modulation data must be computed
and downloaded internally for every frequency change.
The AM_GAIN and AM_OFFSET dc signals are used to calibrate and vary
the am modulation depth settings. AM_GAIN controls the peak-to-peak
output level from U313 in response to modulation depth setting changes.
Likewise, the AM_OFFSET signal varies inversely to the AM_GAIN signal,
as the AM depth setting is varied, to produce a constant signal offset in the
composite AM_IN modulation signal. The net AM_IN offset is independent
of the modulating ac signal component or AM depth setting.
89
Chapter 5 Theory of Operation
Pre-attenuator
Pre-attenuator
Block 6 on block diagram page 129; Schematic on page 136.
All signals, except square waves, pass through the preattenuator.
The preattenuator multiplexes eight resistive 2 dB attenuators to provide
attenuation from 0 dB to 14 dB in 2 dB steps. The 0 dB, 2 dB, and 4 dB
attenuation steps are used for level settings between the 6 dB steps
selected in the output attenuator section. Amplitude settings between
these 2 dB steps are set by smoothly varying the Waveform DAC output
level from 0 dB to -2 dB of its nominal level via the AMP_CTL signal.
Output attenuator 6 dB steps, preattenuator 0 dB, 2 dB, and 4 dB steps,
and small variations (0 dB to 2 dB) of the Waveform DAC output level
are combined to produce each amplitude setting.
In the preattenuator, U601 and U602 are operated as 8-to-1 multiplexers,
each providing selectable 2 dB attenuation steps. Because of the gain
imbalance of the output amplifier (x 12 on +AMP_IN and x (-10) on
-AMP_IN), the +signal path U601 has an additional 2 dB attenuation
always present (R601 and R602) to equalize the nominal gains in both
the plus and minus signal paths.
Square Wave and Sync
Block 6 on block diagram page 129, schematic on page 136.
During square wave outputs, a sine wave signal is generated internally
and squared-up by comparator U620. Square wave amplitude control is
accomplished by variable gain amplifier Q603 and Q604 and switched
into the output signal path through relay K601. A simplified diagram of
the square wave generator is shown below.
90
Chapter 5 Theory of Operation
Square Wave and Sync
Transistors Q601 and Q602 buffer the output of the sine wave anti-alias
filter to the input of comparator U620. Square wave duty cycles are
controlled by the SQ_SYM input on the inverting input of the comparator.
The squarewave outputs of U620 are amplified by variable gain
amplifiers Q603 and Q604.
The amplifier gain output level is controlled by the variable current
source Q605 and U307D in response to the System DAC dc signal
SW_AMP. Squarewave variable gain amplifier output signal levels are
unbalanced by resistors R643 and R644 to correct for the output
amplifier + and - gain differences as discussed in the preattenuator
section on page 90.
Latching relay K601 connects the square wave into the +FUNCTION
and -FUNCTION paths. The relay set or reset state is selected by
momentarily pulsing the appropriate coil. Relay coils are pulsed with
5 volts for 15 ms through relay driver U301. The main controller, U102,
writes data bytes to ASIC U103 which transmits this data to the relay
drivers via the internal 3-wire serial data bus (SERCLK, SERDAT,
and SERSTB) to accomplish relay state changes.
Multiplexer U604 selects one of five sources for the SYNC output: off,
modulation sync, square wave comparator output, RUN*, or Arbitrary
waveform sync. ARB_SYNC is derived from the WA14 line through
U210B. U215B and U210C control the pulse width of the ARB_SYNC
(arbitrary waveform sync) signal. Square wave sync is taken from the
inverting output of square wave comparator U620. U620 also generates
the MOD_SYNC (modulation sync) through U217. Buffer U621 inverts
the sync signal and provides the output current drive to the SYNC output
BNC connector.
91
5
Chapter 5 Theory of Operation
Filters
Filters
Block 5 on block diagram page 129; Schematic on page 135.
The output of the Waveform DAC passes through one of two anti-alias
filters. A 17 MHz 9th order elliptical filter is used for the sine wave and
square wave output functions. A 10 MHz 7th order Bessel filter is used
for filtering all other output functions, including all arbitrary waveshapes.
The diagrams below show the typical frequency response of these filters.
The filters are switched in or out of the signal path by latching relays
K501 and K502. Their set or reset state is selected by momentarily
pulsing the appropriate coil of the relay. Relay coils are pulsed with
5 volts for 15 ms through relay drivers U301 and U302. The main
controller, U102, writes data bytes to ASIC U103 which transmits this data
to the relay drivers via the internal 3-wire serial data bus (SERCLK,
SERDAT, and SERSTB) to accomplish these relay state changes. When
K501 and K502 are set, the 10 MHz Bessel filter is selected.
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Chapter 5 Theory of Operation
Waveform DAC/Amplitude Leveling/Waveform RAM
Waveform DAC/Amplitude Leveling/Waveform RAM
Block 4 on block diagram page 129; Schematic on page 134.
The Waveform DAC, U407, converts 12-bit digital data from waveform
RAM’s U404 and U405 into positive and negative analog voltages.
A simplified diagram of the Waveform DAC circuitry is shown below.
5
The preattenuator, filters, and associated circuits in the output signal path
provide an approximate 25W load for the Waveform DAC. The Waveform
DAC nominally produces a 40 mA differential output current — yielding
differential 1 Vac output signals. Wave shape (amplitude) data is loaded
into the waveform RAM by the main controller CPU U102. Once loaded,
these data are addressed by the DDS ASIC. The rate at which addresses
are incremented determines the output waveform frequency. Waveform
RAM output data is latched and shifted to ECL levels by U402 and U403
for input to the waveform digital-to-analog converter (DAC) U407. DDS
ASIC U206, waveform data latches U402 and U403, and the Waveform
DAC U407 are clocked at 40 MHz. The 40 MHz clock is generated by
oscillator U413 and ECL level-shifter U401.
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Chapter 5 Theory of Operation
Waveform DAC/Amplitude Leveling/Waveform RAM
The Waveform DAC voltage reference is driven by U410B. This reference
controls the magnitude of the nominal 0 to -40 mA DAC output current.
The reference level is varied to produce 0 to -2 dB fine amplitude level
control via dc signal AMP_CTL and –2 dB of dynamic amplitude flatness
correction for static and swept frequency operation via flatness correction
dac U409. These reference voltage adjustments are summed together in
amplifier U410B. Amplitude flatness correction data are stored in
calibration memory during calibration. These data are used to produce a
modulation program with corresponding 8-bit amplitude correction data
values which are gated to latch U412 during operation. These data
provide real-time correction of the output amplitude level as frequency
changes are made. Amplifier U408 and Q401 use the waveform DAC
reference voltage to center the waveform DAC output signal near 0 volts.
U404 and U405 are the high-speed waveform RAM. Together, U404 and
U405 form a 16383 x 12-bit RAM. Each RAM stores and outputs 6 bits of
the waveform DAC 12-bit WD data bus. RAM U404 drives the least
significant 4 bits and U405 drive the most significant 8 bits of the WD
data bus. Note that DAC U407 calls D1 the most-significant bit (MSB)
and D12 it’s least-significant bit (LSB). Waveform RAM addresses are
controlled by the DDS ASIC’s WA (waveform address) bus.
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Chapter 5 Theory of Operation
Direct Digital Synthesis (DDS ASIC)
Direct Digital Synthesis (DDS ASIC)
Block 2 on block diagram page 129; Schematic on page 132.
The DDS ASIC, U206, controls the WA (waveform address) and MA
(modulation address) busses. The waveform address is used by the
waveform RAMs U404 and U405. The modulation data bus is used by the
modulation RAM U205.
The DDS ASIC is comprised of several internal registers and addressing
state machines. Instructions are written to the DDS ASIC by the main CPU
via memory mapped control registers U108 and U202. When loading data
into Waveform RAM or Modulation RAM, addresses on the WA and MA
busses are incremented by ASIC U206. ASIC addresses are incremented
by each rising edge of the TRIG line while writing data into these RAM.
The state of the HOST_RQ* line controls whether the main CPU or the
modulation RAM U205 is sourcing instructions to the DDS ASIC internal
state machines. The Modulation RAM is loaded with frequency values
and amplitude flatness correction values or AM modulation data for latch
U309 and AM dac U313. Data multiplexer U217 and flip-flop U215 are
used to preselect and synchronize the modulation sync source available to
the SYNC output terminal multiplexer U604.
The external trigger input OGEXT is optically isolated by U213 and
applied to an input of trigger source multiplexer U214. The external
trigger input is used for triggering the start of a frequency sweep or
burst output and for externally gating the output signal on and off
asynchronously. U214 selects one of seven trigger sources for use by
U206 for initiating its internal program.
5
95
Chapter 5 Theory of Operation
System DACs
System DACs
Block 3 on block diagram page 129; Schematic on page 133.
All output amplitudes are derived from the internal voltage reference of
System DAC U303. The system dac track/hold amplifier outputs are used
to provide controllable bias voltages to various analog circuits including
AM modulation depth, square wave amplitude, square wave duty cycle,
output dc offset, and output amplitude level. The System DAC is
programmed and responds to the main controller via the internal 3-wire
serial data bus SERCLK, SERRBK, and SERSTB. The System DAC is
multiplexed to 7 track/hold amplifiers through U304. Each track/ hold
amplifier is refreshed approximately every 3 ms to maintain its output
setting. Changes to track/hold amplifier outputs are accomplished by
dwelling on that position for an extended period.
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Chapter 5 Theory of Operation
Floating Logic
Floating Logic
Block 1 on block diagram page 129; Schematic on page 131.
The floating logic controls the operation of the entire function function
generator. All output functions and bus command interpretation is
performed by the main CPU, U102. The front panel and earth referenced
logic operate as slaves to U102. The main CPU portion of the floating logic
section is clocked from a 12 MHz ceramic resonator, Y101. Non-volatile
EEPROM U106 stores arbitrary waveform data, calibration constants,
calibration secure code, calibration count, and last instrument state.
The main CPU, U102, is a 16-bit micro controller. The 16-bit A (address)
bus and 8-bit AD (address/data) bus are used to provide digital
communication with the 256k byte program ROM U104, 32k byte RAM
U105, 128k byte non-volatile EEPROM U106, 32k byte high speed
Modulation RAM U205, 16k x 12-bit high speed waveform RAM U404
and U405 and DDS ASIC U206.
Gate array U103 provides CPU address latching and memory mapping
functions. There are four internal registers in U103: a configuration
register, an 8-bit counter register, a serial transmit/receive register, and
an internal status register. RAM chip select signal RAMCE* and CPU
port bits RAMA13 and RAMA14 are used to access 4 - 8k byte banks of
program data RAM. Similarly, 4 banks of 56k non-volatile EEPROM and
2 banks of 56k non-volatile RAM are gated from CPU port bits PRG16,
PRG17, and WAVA16 and U103 signal ROMCE*. Addresses on the CPU
address bus are valid when the ALE line is high. Memory mapping of
control of registers U107 and U202, DDS ASIC U206, data transceivers
U201, U203, U204, and write enables for RAM U404 and U405 and U205
are controlled by data selector U108.
The U103 serial register controls the front panel, relay drivers U301 and
U302, and System DAC U303 through a serial data bus. Front panel
signals are FPDI, FPSK*, and FPDO. Interrupts from the front panel are
detected by U103 and signaled to U102 by CHINT. The FPINT line from
U102 signals the front panel that U103 has data to send. The internal
3-bit serial data bus (U102) uses SERCK, SERDAT, and SERSTB to send
data to various registers. SERRBK (serial read back) is used by self test
to verify operation of U103, relay drivers U301, U302, and System DAC
shift register U305.
97
5
Chapter 5 Theory of Operation
Earth-Referenced Logic
The main CPU, U102, communicates with the earth referenced logic
through an optically isolated asynchronous serial data link. U101 isolates
the incoming data (OG_RXD*) from the earth referenced logic. Similarly,
U901 isolates the data from U102 (OG_TXD) to the earth reference logic.
Data is sent in an 11-bit frame at a rate of 187.5 k bits/second. When the
RS-232 interface is selected, data is sent across the serial link at 93.75 k
bits/second. The 11-bit internal data frame is configured for one start bit,
eight data bits, one control bit, and one stop bit.
Earth-Referenced Logic
Block 9 on block diagram page 129; Schematic on page 139.
The earth referenced section provides all rear panel input/output
capability. Microprocessor U903 handles GPIB (IEEE-488) control
through bus interface chip U904 and bus receiver/driver chips U907 and
U908. The RS-232 interface is also controlled through U903. RS-232
transceiver chip U906 provides the required level shifting to approximate
– 9 volt logic levels through on-chip charge-pump power supplies using
capacitors C904 and C906. Communication between the earth referenced
logic interface circuits and the floating logic is accomplished through an
optically-isolated bi-directional serial interface. Isolator U101 couples
data from U903 to microprocessor U102. Isolator U901 couples data from
U102 to microprocessor U903.
Power Supplies
Block 10 on block diagram page 129; Schematic on page 140.
The power supply section, is divided into two isolated blocks similar to
the floating logic and earth referenced logic sections discussed earlier.
The floating supply outputs are – 18 Vdc, +5 Vdc, -5.2 Vdc (VEE), and a
6 Vrms center tapped filament supply for the vacuum fluorescent display.
All earth referenced logic is powered from a single +5 Vdc supply.
Power-on reset signals are provided by both the floating and earth
referenced power supplies. In addition, the floating section +5 Vdc supply
incorporates a power failure detection circuit which provides a priority
interrupt signal to the main CPU (U102).
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Chapter 5 Theory of Operation
Power Supplies
The ac mains are connected by a fused power entry module, P1.
This module incorporates the functions of mains connection, on/off
switching, fusing, and line voltage selection (100/120/220 (230)/240).
The line voltage selection function of module P1 selects which primary
winding of power transformer T1 is energized. The transformer
secondary windings are connected to the main pc board through
connector J1001.
The floating +5 Vdc and -5.2 Vdc supplies are produced by a bridge
rectifier formed by diodes CR1006 through CR1009, filter capacitors
C1005 and C1009, and voltage regulators U1003 and U1004. U1005 and
CR1011 form a clamp circuit to provide over voltage protection in the
event of a mains or transformer failure. The PFAIL and PONRST*
signals are derived from the floating +5 Vdc supply. PFAIL is asserted
when the raw 5 Vdc supply drops below 6.4 V signaling an unstable
power supply condition to the main CPU (U102). Current instrument
state information is copied to non-volatile RAM, U106 for future recall if
needed. The PONRST* signal holds the main CPU and other logic in a
reset state until after the +5 Vdc logic power supply is fully operational.
This signal is generally active only following application of line power to
the instrument.
The floating –18 volt supplies are produced by bridge rectifier CR1001,
filter capacitors C1001 and C1003, and regulators U1001 and U1002.
These supplies are used to power all analog circuits in the function generator.
In addition, the vacuum fluorescent display is driven from the – 18 volt
supplies. A separate winding of T1 provides a center tapped 6 Vrms
filament supply for the display. Bias circuit CR1010, R1009, and C1011
generate the required cathode dc bias for the display filament supply.
The 5 volt earth referenced supply is produced by rectifier CR1051,
C1053, and regulator U1051. This supply is earth referenced through
the screw used to mount the PC board to the instrument chassis.
The GPIB (IEEE-488) and RS-232 computer interfaces and the rearpanel EXT Trigger circuits are powered from this supply. A controlled
power-on reset signal for processor U903 is generated by U1052.
99
5
Chapter 5 Theory of Operation
Display and Keyboard
Display and Keyboard
Block 11 on block diagram page 129; Schematic on page 141.
The front panel circuits consist of vacuum fluorescent display control,
display high voltage drivers, and keyboard scanning. Communication
between the front panel and floating logic circuits is accomplished
through a 4-wire bi-directional serial interface. The main CPU, U102,
can cause a hardware reset to processor U1101 by signal IGFPRES.
The front panel logic operates from -13 volts (logic 1) and -18 volts
(logic 0). The four serial communication signals are level shifted by
comparator U1301 from the floating logic 0 V to 5 V levels to the -18 V
to -13 V levels present on the front panel assembly. The front panel logic
high supply (-13 volts) is produced from the -18 volt supply by voltage
regulator U1102.
Display anode and grid voltages are +18 volts for an on segment and
-18 volts for an off segment. The -12 V cathode bias for the display is
provided by the main pc board’s filament winding center tap bias circuit
CR1010, R1009, and C1011 shown on the power supply schematic
(see page 140).
Keyboard scanning is accomplished through a conventional scanned
row-column key matrix. Keys are scanned by outputting data at
microprocessor U1101 port pins P0.0 through P0.4 to poll each key
column for a key press. Column read-back data are read by the
microprocessor at port pins P1.0 through P1.3 for decoding and
communication to the floating logic circuits. Rotary knob quadrature
inputs are read directly by the microprocessor port pins P1.6 and P1.7.
100
6
6
Service
Service
This chapter discusses the procedures involved for returning a failed
function generator to Agilent for service or repair. Subjects covered
include the following:
œ Operating Checklist . . . . . . . . . . . . . . . . . . . 103
œ Types of Service Available . . . . . . . . . . . . . . . 104
œ Repackaging for Shipment . . . . . . . . . . . . . . . 105
œ Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . 105
œ Electrostatic Discharge (ESD) Precautions
. . . . . . 106
œ Surface Mount Repair . . . . . . . . . . . . . . . . . . 106
œ To Replace the Power-Line Fuse . . . . . . . . . . . . 107
œ To Replace the Output Protection Fuse (F801)
œ Troubleshooting Hints
œ Self-Test Procedures
102
. . . . 107
. . . . . . . . . . . . . . . . . 108
. . . . . . . . . . . . . . . . . . 110
Chapter 6 Service
Operating Checklist
Operating Checklist
Before returning your function generator to Agilent for service or repair,
check the following items:
Is the function generator inoperative?
Verify that the ac power cord is connected to the function generator.
Verify that the front-panel Power switch is depressed.
Verify that the power-line fuse is good (see page 22).
The function generator is shipped from the factory with a
500 mAT fuse installed. This is the correct fuse for all line voltages.
Verify the power-line voltage setting.
See “To prepare the function generator for use” on page 21.
Does the function generator fail self-test?
Verify that the correct power-line voltage is selected.
See “To prepare the function generator for use” on page 21.
Is the function generator’s output inoperative?
Turn off the function generator and remove the power cord.
Using an ohmmeter, measure the resistance between the output
BNC center conductor and case. If the ohmmeter measures >100W,
the internal output protection fuse, F801, may be open.
6
103
Chapter 6 Service
Types of Service Available
Types of Service Available
If your function generator fails during the warranty period (within three
years of original purchase), Agilent will replace or repair it free of charge.
After your warranty expires, Agilent will repair or replace it at a
competitive price. The standard repair process is “whole unit exchange”.
The replacement units are fully refurbished and are shipped with new
calibration certificates.
Standard Repair Service (worldwide)
Contact your nearest Agilent Technologies Service Center. They will
arrange to have your function generator repaired or replaced.
Agilent Express Unit Exchange (U.S.A. only)
You will receive a refurbished, calibrated replacement Agilent 33120A in
1 to 4 days.
1
Call 1-877-447-7278 and ask for “Agilent Express”.
œ You will be asked for your serial number, shipping address, and a credit
card number to guarantee the return of your failed unit.
œ If you do not return your failed unit within 15 business days, your credit
card will be billed for the cost of a new 33120A.
2
Agilent will immediately send a replacement 33120A directly to you.
œ The replacement unit will come with instructions for returning your
failed unit. Please retain the shipping carton and packing materials to
return the failed unit to Agilent. If you have questions regarding these
instructions, please call 1-877-447-7278.
œ The replacement unit will have a different serial number than your
failed unit. If you need to track your original serial number, a blank
label will be shipped with the replacement unit to record your original
serial number.
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Chapter 6 Service
Repackaging for Shipment
Repackaging for Shipment
If the unit is to be shipped to Agilent for service or repair, be sure to:
œ Attach a tag to the unit identifying the owner and indicating the required
service or repair. Include the instrument model number and your full
serial number.
œ Place the unit in its original container with appropriate packaging
material.
œ Secure the container with strong tape or metal bands.
If the original shipping container is not available, place your unit in a
container which will ensure at least 4 inches of compressible packaging
material around all sides for the instrument. Use static-free packaging
materials to avoid additional damage to your unit.
Agilent suggests that you always insure shipments.
Cleaning
Clean the outside of the instrument with a soft, lint-free, slightly
dampened cloth. Do not use detergent. Disassembly is not required
or recommended for cleaning.
6
105
Chapter 6 Service
Electrostatic Discharge (ESD) Precautions
Electrostatic Discharge (ESD) Precautions
Almost all electrical components can be damaged by electrostatic
discharge (ESD) during handling. Component damage can occur at
electrostatic discharge voltages as low as 50 volts.
The following guidelines will help prevent ESD damage when servicing
the function generator or any electronic device.
œ Disassemble instruments only in a static-free work area.
œ Use a conductive work area to dissipate static charge.
œ Use a conductive wrist strap to dissipate static charge accumulation.
œ Minimize handling.
œ Keep replacement parts in original static-free packaging.
œ Remove all plastic, styrofoam, vinyl, paper, and other static-generating
materials from the immediate work area.
œ Use only anti-static solder suckers.
WARNING
SHOCK HAZARD. Only service-trained personnel who are aware
of the hazards involved should remove the instrument covers.
To avoid electrical shock and personal injury, make sure to
disconnect the power cord from the function generator before
removing the covers.
Surface Mount Repair
Surface mount components should only be removed using soldering irons
or desoldering stations expressly designed for surface mount components.
Use of conventional solder removal equipment will almost always result in
permanent damage to the printed circuit board and will void your Agilent
factory warranty.
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Chapter 6 Service
To Replace the Power-Line Fuse
To Replace the Power-Line Fuse
The power-line fuse is located within the function generator’s fuse-holder
assembly on the rear panel (see page 22). The function generator is shipped
from the factory with a 500 mAT slow-blow fuse installed (part number
2110-0458). This is the correct fuse for all line voltages.
To Replace the Output Protection Fuse (F801)
The Output Protection Fuse is located inside the function generator.
This fuse is a thru-hole soldered 500 mA part (part number 2110-0716).
The fuse is located near the output connector (J801) on the main PC board.
You will need to disassemble the function generator to replace this fuse
(use a TORX T-15 driver to remove the screws located on the rear panel).
The disassembly procedure is shown on page 130.
6
107
Chapter 6 Service
Troubleshooting Hints
Troubleshooting Hints
This section provides a brief checklist of common failures. Before troubleshooting or repairing the function generator, make sure the failure is in
the instrument rather than any external connections. Also make sure
that the instrument is accurately calibrated. The function generator’s
circuits allow troubleshooting and repair with basic equipment such as a
61‰2-digit multimeter and a 100 MHz oscilloscope.
Unit is Inoperative
Verify that the ac power cord is connected to the function generator.
Verify that the front-panel Power switch is depressed.
Verify that the power-line fuse is good (see page 22).
The function generator is shipped from the factory with a
500 mAT fuse installed. This is the correct fuse for all line voltages.
Verify the power-line voltage setting.
See “To prepare the function generator for use” on page 21.
Unit Reports Error 760
This error may be produced if you accidentally turn off power the unit
during a calibration or while changing a non-volatile state of the
instrument. Recalibration or resetting the state should clear the error.
If the error persists, a hardware failure may have occurred.
Unit Fails Self-Test
Verify that the correct power-line voltage setting is selected. Also, ensure
that all terminal connections (both front panel and rear terminals) are
removed while the self-test is performed. Failure of the System DAC U03
will cause many self-test failures.
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Chapter 6 Service
Troubleshooting Hints
Power Supply Problems
WARNING
SHOCK HAZARD. Only service-trained personnel who are aware
of the hazards involved should remove the instrument covers.
The procedures in this section require that you connect the power
cord to the instrument with the covers removed. To avoid
electrical shock and personal injury, be careful not to touch the
power-line connections.
Check that the input to the supply voltage regulator is at least
1 volt greater than its output.
Circuit failures can cause heavy supply loads which may pull
down the regulator output voltage.
Check the main supply voltages as tabulated below.
Power Supply
Minimum
Maximum
+5 Ground Ref.
4.75V
5.25V
+5 Floating
4.75V
5.25V
-5.2 Floating
-5.46V
-4.94V
+18 Floating
17.0V
19.1V
-18 Floating
-19.1V
-17.0V
+5REF Floating
4.75V
5.25V
Some circuits produce their own local power supplies derived from
the main supplies. Be sure to check that these local supplies are
active. In particular, the output amplifier and front panel sections
have local supplies. Always check that the power supplies are free
of ac oscillations using an oscilloscope.
6
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Chapter 6 Service
Self-Test Procedures
Self-Test Procedures
Power-On Self-Test
Each time the function generator is powered on, a small set of self-tests
are performed. These tests check that the minimum set of logic and
measurement hardware are functioning properly. The power-on self-test
performs checks 601, 625, and 626.
Complete Self-Test
Hold the shift key while turning on the power to perform a complete
self-test. The tests are performed in the order shown below.
Performing Individual Tests
You can perform individual self-tests through the SYStem menu and
TEST command. The parameters allowed are ALL, 603, 604, 605, 606,
607, and 608. All numbered tests are looped to give a continuous pass/fail
indication when started from the menu (they will repeat the waveform or
sync signal until interrupted).
601
Front panel does not respond The main CPU U102 attempts to
establish serial communications with the front panel processor U1101.
During this test, U1101 turns on all display segments. Communication
must function in both directions for this test to pass. If this error is
detected during power-up self-test, the function generator will beep twice.
This error is only readable from the remote interface.
602
RAM read/write failed This test writes and reads a 55H and AAH
checker board pattern to each address of ram U103. Any incorrect
readback will cause a test failure.
603
Waveform RAM readback failed This test writes and reads a A55H
and 5AAH checker board pattern (12-bit) to each address of waveform
ram U404 and U405. The test writes and reads the pattern twice,
at alternating addresses. Any incorrect readback will cause a test failure.
604
Modulation RAM readback failed This test writes and reads a 5AH
and A5H checker board pattern (8-bit) to each address of Modulation ram
U205. The test writes and reads the pattern twice, at alternating
addresses. Any incorrect readback will cause a test failure.
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Chapter 6 Service
Self-Test Procedures
605
Serial configuration readback failed This test re-sends the last 3
byte serial configuration data to all the serial path (SERDAT, SERBCK,
SERCLK). The data is then clocked back into U103 and compared against
the original 3 bytes sent. A failure occurs if the data do not match.
This tests checks the serial data path through U301, U302, and U305.
This tests does not check the serial path to the system DAC U303.
606
Waveform ASIC failed This test is the first part of test 607 (below).
This test sets up a burst modulation program of a special waveform
(a four period ramp wave) where the data at each waveform address is
the same as the last 12 bits of its address. The burst modulation
waveform is run for 1 cycle plus 1 address and the waveform data is read
back and compared. A correct result infers that the modulation program
ran correctly and halted at the correct address. This checks the ability of
U205 and U206 to correctly run a burst modulation program. This test
and test 604 give a high confidence in the modulation circuitry. This test
will fail if a trigger signal is present on the rear panel Ext Trig BNC input.
607
SYNC signal detection failure, Bessel filter path This test runs the
special waveform described in test 606 and counts transitions of the
SYNC line. The test should provide 8 transitions of the SYNC signal.
The test also checks the 7th Order Bessel filter path and U620 and U604.
An incorrect number of transitions will generate an error. This test will
fail if a trigger signal is present on the rear panel Ext Trig BNC input.
608
SYNC signal detection failure, Elliptical filter path This test runs
a special waveform and counts transitions of the SYNC line. The test
should provide 2 transitions of the SYNC line. The test checks the 9th
Order Elliptical filter path. An incorrect number of transitions will
generate an error. This test will fail if a trigger signal is present on the
rear panel Ext Trig BNC input.
625
I/O processor does not respond This test checks that communications
can be established between U102 and U903 through the optically isolated
(U101 and U901) serial data link. Failure to establish communication in
either direction will generate an error. If this condition is detected at
power-on self-test, the function generator will beep and the error
annunciator will be on.
626
I/O processor failed self-test This test causes the earth referenced
processor U903 to execute an internal, ram test. Failure will generate
an error.
701
Checks that the calibration security disable jumper is removed. If the jumper
is shorted at power on, all non-volatile RAM is reset to initial factory values.
111
6
112
7
7
Replaceable Parts
Replaceable Parts
This chapter contains information to help you order replacement parts for
your 33120A Function Generator. The parts lists are divided into the
following groups:
œ 33120-66521 Main PC Assembly (A1)
œ 33120-66502 Front-Panel Display and Keyboard PC Assembly (A2)
œ 33120A Mainframe
œ Manufacturer’s List
Parts are listed in alphanumeric order according to their schematic
reference designators. The parts lists include a brief description of the
part with applicable Agilent part number and manufacturer part number.
To Order Replaceable Parts
You can order replaceable parts from Agilent using the Agilent part
number or directly from the manufacturer using the manufacturer’s part
number. Note that not all parts listed in this chapter are available as
field-replaceable parts. To order replaceable parts from Agilent, do the
following:
1 Contact your nearest Agilent Sales Office or Agilent Service Center.
2 Identify the parts by the Agilent part number shown in the replaceable
parts list. Note that not all parts are directly available from Agilent;
you may have to order certain parts from the specified manufacturer.
3 Provide the instrument model number and serial number.
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Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
C101-C102
C103-C105
C107
C108
C109-C110
C111-C113
C114-C117
C201-C202
C203
C204
0160-6497
0160-5945
0160-5945
0160-6497
0160-5945
0160-6497
0160-5945
0160-6497
0160-5945
0160-6497
C205
C206-C207
C208-C210
C211-C213
C301-C306
C308-C309
C310-C312
C313-C318
C319
C320
0160-5945
0160-6497
0160-5945
0160-6497
0160-6497
0160-6497
0160-5945
0160-6497
0160-5945
0160-6497
C401-C402
C404
C405
C406
C407
C408
C409
C410
C411
C412
0160-6497
0160-5967
0160-5962
0160-5967
0160-5962
0160-5967
0160-6497
0160-5945
0160-6497
0160-5945
C413-C422
C423
C424
C425
C426-C427
C428
C429-C432
C503-C504
C505-C506
C507-C508
0160-6497
0160-5959
0160-5947
0160-6497
0160-6736
0160-5967
0160-6497
0160-7405
0160-5953
0160-5964
C509-C510
C521-C522
C531-C532
C533-C534
0160-5958
0160-5954
0160-5955
0160-5976
Qty
78
26
Part Description
Mfr.
Code
Mfr. Part
Number
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
04222
04222
04222
04222
04222
04222
04222
04222
04222
04222
12065C104KAT A
08055C103KAT A
08055C103KAT A
12065C104KAT A
08055C103KAT A
12065C104KAT A
08055C103KAT A
12065C104KAT A
08055C103KAT A
12065C104KAT A
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
04222
04222
04222
04222
04222
04222
04222
04222
04222
04222
08055C103KAT A
12065C104KAT A
08055C103KAT A
12065C104KAT A
12065C104KAT A
12065C104KAT A
08055C103KAT A
12065C104KAT A
08055C103KAT A
12065C104KAT A
CAP-FXD 0.1 uF 25 V
CAP-FXD 100 pF 50 V
CAP-FXD 15 pF 50 V
CAP-FXD 100 pF 50 V
CAP-FXD 15 pF 50 V
CAP-FXD 100 pF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01 uF 50 V
04222
04222
04222
04222
04222
04222
04222
04222
04222
04222
12065C104KAT A
08051A101JAT A
08051A150JAT A
08051A101JAT A
08051A150JAT A
08051A101JAT A
12065C104KAT A
08055C103KAT A
12065C104KAT A
08055C103KAT A
2
5
3
CAP-FXD 0.1 uF 25 V
CAP-FXD 33 pF 50 V
CAP-FXD 1000 pF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.01uF +-10% 50 V CER X7R
CAP-FXD 100 pF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 560 pF +-10% 50 V CER X7R
CAP-FXD 270 pF 50 V
CAP-FXD 180 pF 50 V
04222
04222
04222
04222
51406
04222
04222
28480
02444
04222
12065C104KAT A
08051A330JAT A
08055C102KAT A
12065C104KAT A
GRM426X7R103K50
08051A101JAT A
12065C104KAT A
0160-7405
08051A271JAT A
08051A181JATRA
2
3
4
2
CAP-FXD 39 pF 50 V
CAP 220 pF 5% 50V
CAP-FXD 68 pF 50 V
CAP-FXD 12 pF 50 V
04222
04222
04222
04222
08051A390JAT A
08051A221JAT A
08051A680JATRA
08051A120JAT A
6
2
1
4
2
115
7
Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
C535-C536
C539-C540
C541-C542
C543-C544
C545-C546
C547-C548
C551-C552
C553-C554
C601-C607
C608
0160-5952
0160-7721
0160-5965
0160-5967
0160-7733
0160-5953
0160-5961
0160-5965
0160-6497
0160-5954
2
2
2
C623
C624
C630
C631
C632-C633
C702
C703-C704
C705
C706-C707
C709
0180-3975
0160-5945
0160-5945
0160-5955
0160-5957
0160-5953
0160-5975
0160-5942
0180-3975
0160-5975
5
C710
C711
C712
C713
C714-C719
C720
C802
C901
C902
C903-C906
0180-3975
0180-3859
0180-3975
0180-3859
0160-6497
0160-5942
0160-5964
0160-6497
0160-5955
0160-6497
C908
C909-C911
C913
C1001
C1002
C1003
C1004
C1005
C1006
C1007-C1008
0160-5945
0160-6497
0160-6497
0180-4313
0180-3751
0180-4313
0180-3751
0180-4086
0180-3751
0160-6497
C1009
C1010-C1011
C1013
C1014
C1015-1016
0180-4589
0180-4116
0160-6497
0180-4116
0160-6497
Qty
2
2
2
3
2
2
2
3
2
1
4
116
Part Description
Mfr.
Code
Mfr. Part
Number
CAP-FXD 330 pF 50 V
CAP-FXD 82 pF +-1% 50 V CER C0G
CAP-FXD 150pF +-5% 50 V CER C0G
CAP-FXD 100 pF 5%
CAP-FXD 100 pF +-1% 50 V CER C0G
CAP-FXD 270 pF 50 V
CAP-FXD 22 pF 50 V
CHIP CAPACITOR
CAP-FXD 0.1 uF 25 V
CAP 220 pF 5% 50V
04222
04222
04222
04222
04222
04222
04222
04222
04222
04222
08055A331JAT A
08055A820FATMA
08051A151JAT A
08051A101JAT A
08055A101FAT_A
08051A271JAT A
08051A220JAT A
08051A151JAT A
12065C104KAT A
08051A221JAT A
CAP-FXD 2.2 uF 20 V TA
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 68 pF 50 V
CAP-FXD 47 pF
CAP-FXD 270 pF 50 V
CAP-FXD 10 pF 50 V
CAP-FXD 1 pF 50 V
CAP-FXD 2.2 uF 20 V TA
CAP-FXD 10 pF 50 V
04222
04222
04222
04222
04222
02444
04222
04222
04222
04222
TAJB225M020
08055C103KAT A
08055C103KAT A
08051A680JATRA
08051A470JAT A
08051A271JAT A
08051A100JAT A
08051A1R0CAT A
TAJB225M020
08051A100JAT A
CAP-FXD 2.2 uF 20 V TA
CAP-FXD 1000 uF+-20% 35 VDC
CAP-FXD 2.2 uF 20 V TA
CAP-FXD 1000 uF+-20% 35 VDC
CAP-FXD 0.1 uF 25 V
CAP-FXD 1 pF 50 V
CAP-FXD 180 pF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 68 pF 50 V
CAP-FXD 0.1 uF 25 V
04222
S4217
04222
S4217
04222
04222
04222
04222
04222
04222
TAJB225M020
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 0.1 uF 25 V
CAP 2200 uF 50V
CAP-FXD 1 uF 35 V TA
CAP-FXD 2200 uF 50V
CAP-FXD 1 uF 35 V TA
CAP-FXD .01 F+-20% 25 VDC AL
CAP-FXD 1 uF 35 V TA
CAP-FXD 0.1 uF 25 V
04222
04222
04222
S4217
04222
S4217
04222
S4217
04222
04222
CAP-FXD +-20% 16 V AL-ELCTLT
CAP-FXD 22 uF 20 V TA
CAP-FXD 0.1 uF 25 V
CAP-FXD 22 uF 20 V TA
CAP-FXD 0.1 uF 25 V
S4217
04222
04222
04222
04222
SME35VB102M12.5X25LL
TAJB225M020
SME35VB102M12.5X25LL
12065C104KAT A
08051A1R0CAT A
08051A181JATRA
12065C104KAT A
08051A680JATRA
12065C104KAT A
08055C103KAT A
12065C104KAT A
12065C104KAT A
KME50VB222M18X35LL
TAJB105M035
KME50VB222M18X35LL
TAJB105M035
SME25VN103M22X45LL
TAJB105M035
12065C104KAT A
SMH16VN153M22X35LL
TAJD226M020
12065C104KAT A
TAJD226M020
12065C104KAT A
Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
C1017-1019
C1020-1021
C1051-C1052
C1053
C1054
C1055
0160-5947
0160-5945
0160-6497
0180-4086
0180-4116
0160-6497
CR301
CR302-CR303
CR401
CR601
CR701-CR702
CR703-CR704
CR709-CR710
CR801-CR802
CR803-CR804
CR901-CR904
1906-0291
1902-1541
1902-1541
1906-0291
1902-1512
1902-1610
1902-1610
1901-1386
1902-1807
1906-0291
8
3
CR1001
CR1002-1003
CR1004-1005
CR1006-1009
CR1010
CR1051
CR1052
1906-0407
1906-0291
1902-1609
1901-1607
1902-1609
1906-0407
1901-1346
2
E901
F801
FB401-FB402
FB601
FB701-FB702
FB1001-1002
HS1001-1004
HSQ713
HSQ718
9164-0173
2110-0716
9170-1421
9170-1421
9170-1421
9170-1421
1205-0880
1205-0213
1205-0213
1
1
7
J101
J102
J301
J401
J601
J701
J801
J901
J902
J903
J1001
J1002
J1051
1252-4484
1252-4683
1250-1884
1250-0257
1251-2969
1251-5066
1251-2969
1252-2266
1252-2161
1250-1884
1252-5136
1251-5066
1252-4487
1
1
2
1
2
2
Qty
2
4
2
2
8
3
4
1
4
2
1
1
1
1
Part Description
Mfr.
Code
Mfr. Part
Number
CAP-FXD 1000 pF 50 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD .01 F+-20% 25 VDC
CAP-FXD 22 uF 20 V TA
CAP-FXD 0.1 uF 25 V
04222
04222
04222
S4217
04222
04222
08055C102KAT A
08055C103KAT A
12065C104KAT A
TAJD226M020
12065C104KAT A
DIODE- 70V 100MA
DIODE-ZNR 3.3V 5% TO-236 (SOT-23)
DIODE-ZNR 3.3V 5% TO-236 (SOT-23)
DIODE- 70V 100MA
DIODE-ZNR 7.5V 5% PD=.155W TC=+5.3MV
DIODE-ZNR SMB 3.3V 5% 1W
DIODE-ZNR SMB 3.3V 5% 1W
DIODE SI PN SOT23 100V 750MA
DIODE-ZNR SMB 24V 42MA 1.0W 5%
DIODE- 70V 100MA
04713
04713
04713
04713
04713
04713
04713
28480
04713
04713
MBAV99
BZX84C3V3
BZX84C3V3
MBAV99
BZX84C7V5
1SMB5913B
1SMB5913B
1901-1386
1SMB5934BT3
MBAV99
DIODE-FW BRDG 400V 1A
DIODE- 70V 100MA
DIODE-ZNR 6.2V 5% PD=1.5W IR=5UA
DIODE-PWR RECT SMC 400V 2.5A 2.5US S3G
DIODE-ZNR 6.2V 5% PD=1.5W IR=5UA
DIODE-FW BRDG 400V 1A
DIODE,TVS,D0214AB,43V,1500WP,SMCJ43CA
71744
04713
04713
71744
04713
71744
71744
DF04S
MBAV99
1SMB5920B
S3G
1SMB5920B
DF04S
SMCJ43CA
BEEPER
FUSE-SUBMINIATURE .50A 125V NTD AX UL
BEAD, SHIELDING (CHOKE)
BEAD, SHIELDING (CHOKE)
BEAD, SHIELDING (CHOKE)
BEAD, SHIELDING (CHOKE)
HEATSINK-TO-220
HEAT SINK SGL TO-5/TO-39-CS
HEAT SINK SGL TO-5/TO-39-CS
51406
75915
28480
28480
28480
28480
13103
13103
13103
PKM24-4AO-1
R251.500T1
9170-1421
9170-1421
9170-1421
9170-1421
7021B-TC10-MT
2228B
2228B
CONN-POST TYPE 2.0-PIN-SPCG 12-CONT
CONN-FRCC VERT MALE 10PIN SMC
CONNECTOR-RF BNC RCPT, 50-OHM
CONNECTOR-RF SMB PLUG 50-OHM
CONN PHONE VERT
CONN DIS VERT MALE 2PIN FP
CONN PHONE VERT
CONN-RECT D-SUBMIN 9-CKT 9-CONT
CONN-RECT MICRORBN 24-CKT 24-CONT
CONN-RF BNC RCPT PC-W-STDFS 50-OHM
CONN-DIS FRIC LOCK VERT MALE 9PIN
CONN DIS VERT MALE 2 PIN FP
CONN-POST TYPE .156-PIN-SPCG 3-CONT
27264
76381
00779
00779
27264
27264
27264
00779
00779
00779
27264
27264
27264
52007-1210
N3662-6202
227161-6
413990-3
15-24-0503
22-04-1021
15-24-0503
748959-1
554923-2
227161-6
26-64-4090
22-04-1021
26-64-4030
SME25VN103M22X45LL
7
117
Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
JM1001-1004
JM1051
0699-1503
0699-1503
7
RESISTOR .05 +-100% TKF
RESISTOR .05 +-100% TKF
28480 0699-1503
28480 0699-1503
K501-K502
K601-K602
K801-K804
0490-1664
0490-1664
0490-1664
8
RELAY 2C 5VDC-COIL 1A 110VDC
RELAY 2C 5VDC-COIL 1A 110VDC
RELAY 2C 5VDC-COIL 1A 110VDC
28480 0490-1664
28480 0490-1664
28480 0490-1664
L501-L502
L503-L504
L505-L506
L521-L522
L531-L532
L533-L534
L535-L536
L537-L538
L601-L602
L801
9140-1716
9140-1102
9140-1425
9140-1102
9140-1103
9140-1102
9140-1101
9140-1102
0699-1503
9140-1099
2
8
2
INDUCTOR 910 nH +2% -2%
INDUCTOR 560 nH +-5% 2.8W-MMX3.4LG-MM
INDUCTOR SMT 270 nH 5%
INDUCTOR 560 nH +-5% 2.8W-MMX3.4LG-MM
INDUCTOR 680 nH +-5% 2.8W-MMX3.4LG-MM
INDUCTOR 560 nH +-5% 2.8W-MMX3.4LG-MM
INDUCTOR 470 nH +-5% 2.8W-MMX3.4LG-MM
INDUCTOR 560 nH +-5% 2.8W-MMX3.4LG-MM
RESISTOR .05 +-100% TKF
INDUCTOR SMT 220 nH 5%
02113
24226
24226
24226
24226
24226
24226
24226
28480
09021
1008CS-911XGBC
03273
SM3-270J
03273
03273
03273
03273
03273
0600-1503
KL32TER22J
Q401
Q601-Q602
Q603-Q604
Q605
Q701
Q702
Q704
Q705
Q707
Q708
1854-1037
1854-1037
1853-0516
1853-0567
1854-1148
1853-0516
1854-1148
1853-0567
1853-0516
1854-1037
TRANSISTOR PD=350 MW FT=300 MHZ
TRANSISTOR PD=350 MW FT=300 MHZ
TRANSISTOR PD=350 MW FT=600 MHZ
TRANSISTOR PD=350 MW FT=250 MHZ
TRANSISTOR PD=350 MW FT=650 MHZ
TRANSISTOR PD=350 MW FT=600 MHZ
TRANSISTOR PD=350 MW FT=650 MHZ
TRANSISTOR PD=350 MW FT=250 MHZ
TRANSISTOR PD=350 MW FT=600 MHZ
TRANSISTOR PD=350 MW FT=300 MHZ
04713
04713
04713
04713
04713
04713
04713
04713
04713
04713
MMBT3904
MMBT3904
MMBTH81
MMBT3906
MMBTH10
MMBTH81
MMBTH10
MMBT3906
MMBTH81
MMBT3904
Q709
Q710
Q711-Q712
Q713
Q714
Q715-Q717
Q718
1854-1445
5063-1420
1853-0728
1854-0597
1853-0728
1854-1303
1853-0293
1
1
3
1
TRANSISTOR NPN SI SC-59
TRANSISTOR PNP 600 MHZ
TRANSISTOR PNP SI TO-261AA (SOT-223)
TRANSISTOR NPN 2N5943 SI TO-39 PD=1W
TRANSISTOR PNP SI TO-261AA (SOT-223)
TRANSISTOR NPN SI TO-261AA (SOT-223)
TRANSISTOR P RF TO39 30V 500 MA 1GHZ
28480
28480
28480
04713
28480
28480
04713
1854-1445
5063-1420
1853-0728
2N5943
1853-0728
1854-1303
2N5583
R101-R104
R106-R109
R110
R111-R112
R114-R116
R117
R118-R119
R120-R121
R201
R203
R205
0699-1318
0699-1423
0699-1386
0699-1318
0699-1391
0699-1423
0699-1318
0699-1423
0699-1318
0699-1391
0699-3034
20
12
1
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 215 +-1% .125 W TKF TC=0+-100
RESISTOR 5.62K +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 10K +-1% .125 W TKF TC=0+-100
RESISTOR 215 +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 215 +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 10K +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .1W TKF TC=0+-100
28480
28480
28480
28480
28480
28480
28480
28480
28480
28480
2M627
0699-1318
0699-1423
0699-1386
0699-1318
0699-1391
0699-1423
0699-1318
0699-1423
0699-1318
0699-1391
MCR10-FZHM-F-1001
118
Qty
2
2
1
4
4
2
2
3
11
1
Part Description
Mfr.
Code
Mfr. Part
Number
Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
R301
R302
R303-R304
R305
R307-R308
R309
R310
R311
R313-R314
0699-1403
0699-3211
0699-1318
0699-1391
0699-3431
0699-1937
0699-1384
0699-1344
0699-1434
R316
R317
R318-R320
R321
R322
R323
R324
R401
R402
R404
0699-1391
0699-1374
0699-3431
0699-1318
0699-3211
0699-1400
0699-1432
0699-1344
0699-3698
0699-3041
R405-R406
R407-R408
R409
R410
R411
R412
R413
R414
R415
R418
0699-2889
0699-2832
0699-1381
0699-2489
0699-1415
0699-2937
0699-2431
0699-1318
0699-1391
0699-3594
2
2
1
3
19
1
1
R420
R421
R422
R423
R424
R501-R502
R521-R522
R601
R602-R609
R610
0699-2103
0699-3431
0699-1423
0699-1431
0699-1318
0699-3763
0699-2488
0699-1433
0699-1345
0699-1826
2
R611-R614
R615
R616-R622
R623
R624-R625
R626
R627-R628
0699-1415
0699-1433
0699-1345
0699-1826
0699-1415
0699-2712
0699-1415
Qty
1
2
6
1
6
4
2
2
1
8
1
1
1
1
10
10
3
15
2
2
Mfr.
Code
Mfr. Part
Number
RESISTOR 31.6K +-1% .125 W TKF TC=0+-100
RESISTOR 39.2K 1% 1206 .125 W 200V TC=100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 10K +-1% .125 W TKF TC=0+-100
RESISTOR 4.99K +-1% .125 W TKF TC=0+-100
RESISTOR 1.24K 1% 1206 .125 W TC=100 200V
RESISTOR 4.64K +-1% .125 W TKF TC=0+-100
RESISTOR 10 +-1% .125 W TKF TC=0+-100
RESISTOR 619 +-1% .125 W TKF TC=0+-100
28480
28480
28480
28480
28480
28480
28480
28480
28480
0699-1403
0699-3211
0699-1318
0699-1391
0699-3431
0699-1937
0699-1384
0699-1344
0699-1434
RESISTOR 10K +-1% .125 W TKF TC=0+-100
RESISTOR 1.78K +-1% .125 W TKF TC=0+-100
RESISTOR 4.99K +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 39.2K 1% 1206 .125 W 200V TC=100
RESISTOR 26.1K +-1% .125 W TKF TC=0+-100
RESISTOR 511 +-1% .125 W TKF TC=0+-100
RESISTOR 10 +-1% .125 W TKF TC=0+-100
RESISTOR 10 +-1% .1W TKF TC=0+-100
RESISTOR 3.48K +-1% .1W TKF TC=0+-100
28480
28480
28480
28480
28480
28480
28480
28480
2M627
2M627
0699-1391
0699-1374
0699-3431
0699-1318
0699-3211
0699-1400
0699-1432
0699-1344
MCR10-F-10R0
MCR10-F-3481
RESISTOR 4.7 +-5% .125 W TKF
RESISTOR 200 +-0.1% .125 W TF TC=0+-25
RESISTOR 3.48K +-1% .125W TKF TC=0+-100
RESISTOR 10K +-0.1% .125 W TF TC=0+-25
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 16K +-0.1% .125W TF TC=0+-25
RESISTOR 3.32K +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 10K +-1% .125 W TKF TC=0+-100
RESISTOR 20.5K +-0.1% .125W TF TC=0+-25
2M627
11502
2M627
11502
28480
09021
28480
28480
28480
11502
MCR18J4R
W1206R032000BT
MCR18-F-3481
W1206R031002BT
0699-1415
RN73E2BTE1602B
0699-2431
0699-1318
0699-1391
W1206R03-2052B
RESISTOR 49.9 +-1% .125 W TKF TC=0+-100
RESISTOR 4.99K +-1% .125 W TKF TC=0+-100
RESISTOR 215 +-1% .125 W TKF TC=0+-100
RESISTOR 464 +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 69 .1% 1206 .125 W 100V TC=25
RESISTOR 100 +-0.1% .125 W TF TC=0+-25
RESISTOR 562 +-1% .125 W TKF TC=0+-100
RESISTOR 11 +-1% .125 W TKF TC=0+-100
RESISTOR 45.3 +-1% .125 W TKF TC=0+-100
28480
28480
28480
28480
28480
11502
11502
28480
28480
28480
0699-2103
0699-3431
0699-1423
0699-1431
0699-1318
W1206-R03-69R0-B
W1206R031000BT
0699-1433
0699-1345
0699-1826
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 562 +-1% .125 W TKF TC=0+-100
RESISTOR 11 +-1% .125 W TKF TC=0+-100
RESISTOR 45.3 +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 255 +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-1% .125 W TKF TC=0+-100
28480
28480
28480
28480
28480
28480
28480
0699-1415
0699-1433
0699-1345
0699-1826
0699-1415
0699-2712
0699-1415
Part Description
7
119
Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
R629
R630
R631
R632-R633
R634
R635
R636-R637
R638-R639
R640
R641
0699-2712
0699-1415
0699-1432
0699-1384
0699-1415
0699-1432
0699-1384
0699-1344
0699-1432
0699-2631
R642
R643
R644
R645
R646
R647-R648
R649
R650
R651
R652
0699-1432
0699-2196
0699-1415
0699-1432
0699-1352
0699-1332
0699-1392
0699-1330
0699-1392
0699-1318
R653
R654
R655
R656
R657
R658
R659
R660
R661
R662
0699-2103
0699-1432
0699-2631
0699-1415
0699-1366
0699-1360
0699-1432
0699-1318
0699-1398
0699-1330
R663
R664
R701-R702
R703-R704
R705-R706
R707-R708
R710
R711
R712
R713
0699-1421
0699-2883
0699-2843
0699-2489
0699-2631
0699-1422
2100-4199
0699-2883
0699-1394
0699-1366
R715-R716
R717
R718
R719-R720
R722
R723
0699-1415
0699-2883
0699-1351
0699-1415
0699-1366
0699-1351
120
Qty
4
1
1
2
2
3
3
1
2
2
3
2
2
1
1
2
Mfr.
Code
Mfr. Part
Number
RESISTOR 255 +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-1% .125 W TKF TC=0+-10
RESISTOR 511 +-1% .125 W TKF TC=0+-100
RESISTOR 4.64K +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-1% .125 W TKF TC=0+-10
RESISTOR 511 +-1% .125 W TKF TC=0+-100
RESISTOR 4.64K +-1% .125 W TKF TC=0+-100
RESISTOR 10 +-1% .125 W TKF TC=0+-100
RESISTOR 511 +-1% .125 W TKF TC=0+-100
RESISTOR 2K +-1% .125 W TKF TC=0+-100
28480
28480
28480
28480
28480
28480
28480
28480
28480
28480
0699-2712
0699-1415
0699-1432
0699-1384
0699-1415
0699-1432
0699-1384
0699-1344
0699-1432
0699-2631
RESISTOR 511 +-1% .125 W TKF TC=0+-100
RESISTOR 78.7 1% 1206 .125 W 200 V TC=100
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 511 +-1% .125 W TKF TC=0+-100
RESISTOR 21.5 +-1% .125 W TKF TC=0+-100
RESISTOR 196K +-1% .125 W TKF TC=0+-100
RESISTOR 11K +-1% .125W TKF TC=0+-100
RESISTOR 100K +-1% .125 W TKF TC=0+-100
RESISTOR 11K +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
28480
28480
28480
28480
28480
28480
28480
28480
28480
28480
0699-1432
0699-2196
0699-1415
0699-1432
0699-1352
0699-1332
0699-1392
0699-1330
0699-1392
0699-1318
RESISTOR 49.9 +-1% .125 W TKF TC=0+-100
RESISTOR 511 +-1% .125 W TKF TC=0+-100
RESISTOR 2K +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 82.5 +-1% .125 W TKF TC=0+-100
RESISTOR 46.4 +-1% .125 W TKF TC=0+-100
RESISTOR 511 +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 21.5K +-1% .125 W TKF TC=0+-100
RESISTOR 100K +-1% .125 W TKF TC=0+-100
28480
28480
28480
28480
28480
28480
28480
28480
28480
28480
0699-2103
0699-1432
0699-2631
0699-1415
0699-1366
0699-1360
0699-1432
0699-1318
0699-1398
0699-1330
RESISTOR 178 +-1% .125 W TKF TC=0+-100
RESISTOR 1.4K 1% 1206 .125 W 200V TC=100
RESISTOR 100K +-0.1% .125 W TF TC=0+-25
RESISTOR 10K +-0.1% .125 W TF TC=0+-25
RESISTOR 2K +-1% .125 W TKF TC=0+-100
RESISTOR 196 +-1% .125 W TKF TC=0+-100
RESISTOR-TRMR 100 20% TKF TOP-ADJ 1-TRN
RESISTOR 1.4K 1% 1206 .125 W 200V TC=100
RESISTOR 14.7K +-1% .125 W TKF TC=0+-100
RESISTOR 82.5 +-1% .125 W TKF TC=0+-100
28480
28480
11502
11502
28480
28480
32997
28480
28480
28480
0699-1421
0699-2883
W1206R031003BT
W1206R031002BT
0699-2631
0699-1422
3314G-1-101E
0699-2883
0699-1394
0699-1366
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 1.4K 1% 1206 .125 W 200V TC=100
RESISTOR 19.6 +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 82.5 +-1% .125 W TKF TC=0+-100
RESISTOR 19.6 +-1% .125 W TKF TC=0+-100
28480
28480
28480
28480
28480
28480
0699-1415
0699-2883
0699-1351
0699-1415
0699-1366
0699-1351
Part Description
Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
R724
R725
R726-R727
R728
R729-R730
R731-R732
R734-R735
R738
R739
R740
0699-1437
0699-1415
0699-2064
0699-1415
0699-1827
0699-2890
0699-2890
0699-1378
0699-1387
0699-1426
R741
R744-R747
R748-R749
R750-R751
R752-R755
R756
R758
R760-R764
R766-R772
R774-R775
0699-1437
0699-2488
0699-1437
0699-1387
0699-2488
0699-3019
0699-3019
0699-3019
0699-3019
0699-3022
R801
R802-R803
R804-R806
R807-R808
R809
R810-R811
R812-R813
R814
R815
R816-R817
0699-3769
0699-1423
0699-3770
0699-3765
0699-3762
0699-3766
0699-3763
0699-3767
0699-3763
0699-1423
R818
R819
R820
R821
R822-R823
R824-R825
R826-R827
R828-R829
R830-R832
R833
0699-2852
0699-3770
0699-2852
0699-3769
0699-3764
0699-3765
0699-3763
0699-3769
0699-3762
0699-3767
R834-R836
R837
R901
R902
R904-R905
R906
R907
0699-3763
0699-1383
0699-1318
0699-1330
0699-1318
0699-1374
0699-1398
Qty
4
2
2
4
1
3
1
14
2
4
4
4
4
2
2
2
2
1
Part Description
Mfr.
Code
Mfr. Part
Number
RESISTOR 825 +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 6.8 +-5% .125 W TKF TC=0+-500
RESISTOR 100 +-1% .125 W TKF TC=0+-100
RESISTOR 130 1% 1206PKG TC=100 200V 1/8W
RESISTOR 3.3 5% 1206 .125 W 200V TC=500
RESISTOR 3.3 5% 1206 .125 W 200V TC=500
RESISTOR 2.61K +-1% .125 W TKF TC=0+-100
RESISTOR 6.81K +-1% .125 W TKF TC=0+-100
RESISTOR 287 +-1% .125 W TKF TC=0+-100
28480
28480
2M627
28480
28480
2M627
2M627
28480
28480
28480
0699-1437
0699-1415
MCR18J
0699-1415
0699-1827
MCR18EZHJ3R3E
MCR18EZHJ3R3E
0699-1378
0699-1387
0699-1426
RESISTOR 825 +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-0.1% .125 W TF TC=0+-25
RESISTOR 825 +-1% .125 W TKF TC=0+-100
RESISTOR 6.81K +-1% .125 W TKF TC=0+-100
RESISTOR 100 +-0.1% .125 W TF TC=0+-25
RESISTOR 26.1 1% SM0805 .1 W TC=250 100V
RESISTOR 26.1 1% SM0805 .1 W TC=250 100V
RESISTOR 26.1 1% SM0805 .1 W TC=250 100V
RESISTOR 26.1 1% SM0805 .1 W TC=250 100V
RESISTOR 46.4 +-1% .1 W TKF TC=0+-200
28480
11502
28480
28480
11502
28480
28480
28480
28480
28480
0699-1437
W1206R031000BT
0699-1437
0699-1387
W1206R031000BT
0699-3019
0699-3019
0699-3019
0699-3019
0699-3022
RESISTOR 11.8 +-1% .125 W TKF TC=0+-100
RESISTOR 215 +-1% .125 W TKF TC=0+-100
RESISTOR 23.7 +-0.1% .125 W TF TC=0+-25
RESISTOR 115 .1% 1206 .125 W 100V TC=25
RESISTOR 53 .1% 1206 .125 W 100V TC=25
RESISTOR 232 .1% 1206 .125 W 100V TC=25
RESISTOR 69 .1% 1206 .125 W 100V TC=25
RESISTOR 309 .1% 1206 .125 W 100V TC=25
RESISTOR 69 .1% 1206 .125 W 100V TC=25
RESISTOR 215 +-1% .125 W TKF TC=0+-100
28480
28480
11502
11502
11502
11502
11502
11502
11502
28480
0699-3769
0699-1423
W1206-R03-23R7-B
W1206-R03-1150-B
W1206-R03-53R0-B
W1206-R03-2320-B
W1206-R03-69R0-B
W1206-R03-3090-B
W1206-R03-69R0-B
0699-1423
RESISTOR 442 +-1% .125 W TKF TC=0+-100
RESISTOR 23.7 +-0.1% .125 W TF TC=0+-25
RESISTOR 442 +-1% .125 W TKF TC=0+-100
RESISTOR 11.8 +-1% .125 W TKF TC=0+-100
RESISTOR 442 0.1% 1206 .125W 100V TC=25
RESISTOR 115 .1% 1206 .125W 100V TC=25
RESISTOR 69 .1% 1206 .125 W 100V TC=25
RESISTOR 11.8 +-1% .125 W TKF TC=0+-100
RESISTOR 53 .1% 1206 .125 W 100V TC=25
RESISTOR 309 .1% 1206 .125 W 100V TC=25
28480
11502
28480
28480
11502
11502
11502
28480
11502
11502
0699-2852
W1206-R03-23R7-B
0699-2852
0699-3769
W1206-R03-4420-B
W1206-R03-1150-B
W1206-R03-69R0-B
0699-3769
W1206-R03-53R0-B
W1206-R03-3090-B
RESISTOR 69 .1% 1206 .125 W 100V TC=25
RESISTOR 4.22K +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 100K +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 1.78K +-1% .125 W TKF TC=0+-100
RESISTOR 21.5K +-1% .125 W TKF TC=0+-100
11502
28480
28480
28480
28480
28480
28480
W1206-R03-69R0-B
0699-1383
0699-1318
0699-1330
0699-1318
0699-1374
0699-1398
121
7
Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
Mfr.
Code
Mfr. Part
Number
R908
R909
R910
R1001
R1002
R1003
R1004
R1008-R1009
R1010
R1011
0699-1318
0699-3408
0699-1391
0699-1380
0699-1424
0699-1380
0699-1424
0699-1391
0699-1421
0699-1433
RESISTOR 1K +-1% .125 W TKF TC=0+-100
RESISTOR 1K +-5% 1 W TKF TC=0+-200
RESISTOR 10K +-1% .125 W TKF TC=0+-100
RESISTOR 3.16K +-1% .125 W TKF TC=0+-100
RESISTOR 237 +-1% .125 W TKF TC=0+-100
RESISTOR 3.16K +-1% .125 W TKF TC=0+-100
RESISTOR 237 +-1% .125 W TKF TC=0+-100
RESISTOR 10K +-1% .125 W TKF TC=0+-100
RESISTOR 178 +-1% .125 W TKF TC=0+-100
RESISTOR 562 +-1% .125W TKF TC=0+-100
28480
2M627
28480
28480
28480
28480
28480
28480
28480
28480
0699-1318
MCR1001KJ
0699-1391
0699-1380
0699-1424
0699-1380
0699-1424
0699-1391
0699-1421
0699-1433
R1012
R1013
R1014
R1052
0699-1391
0699-1380
0699-1384
0699-1327
1
RESISTOR 10K +-1% .125 W TKF TC=0+-100
RESISTOR 3.16K +-1% .125 W TKF TC=0+-100
RESISTOR 4.64K +-1% .125 W TKF TC=0+-100
RESISTOR 1M +-1% .125 W TKF TC=0+-100
28480
28480
28480
28480
0699-1391
0699-1380
0699-1384
0699-1327
RP301-RP302
RP401
RP403-RP404
RP601
1810-1360
1810-1065
1810-1331
1810-1159
2
1
2
1
RESISTOR-NETWORK 16PINS,THICK FILM,SMD
NET-RES 15 1.0K OHM 16-PIN
NET-RES 8 220.0 OHM 16-PIN
RESISTOR-NETWORK
28480
11236
11236
28480
1810-1360
767161102G
767163221G
1810-1159
SHD902
SPR1-SPR2
SPR10-SPR20
33120-00614
0380-0643
2190-0577
1
2
2
RFI SHIELD
STANDOFF-HEX .255-IN-LG 6-32-THD
WASHER- NO. 10 .194-IN-ID .294-IN-OD
28480 33120-00614
28480 0380-0643
20859 03118
U101
U102
U103
U104
U105
U106
U107
U108
U109
U201
U202
1990-1552
1821-1479
1820-8907
33120-88861
1818-4777
1818-5699
1820-5808
1820-5941
1820-5944
1820-6306
1820-5808
3
1
1
1
1
1
2
1
2
3
OPTO-ISOLATOR LED-IC GATE IF=10 MA-MAX
IC-BIT SLICE MPU/MCU
IC GATE-ARY CMOS
PROG PAL
IC 256K-BIT SRAM 70-NS CMOS
IC, CMOS, AMB, 32 PIN, 120 NANOSECONDS
IC FF CMOS/74HC D-TYPE POS-EDGE
IC DCDR CMOS/74ACT BIN 8-TO-1-LINE
74ACT32-GATE, QUAD 2-INPUT OR
IC TRANSCEIVER CMOS/HCT BUS OCTL
IC FF CMOS/74HC D-TYPE POS-EDGE
28480
34649
27014
28480
28480
34335
04713
28480
28480
27014
04713
HCPL-2211-300
N80C196KB
SCX6206AK0
33120-88861
1818-4777
AM29F010-120JC
MC74HC273DW
1820-5941
1820-5944
MM74HCT245WM
MC74HC273DW
U203-U204
U205
U206
U210
U211
U212
U213
U214
U215
U216
U217
U218
1820-6306
1818-5093
1821-0976
1820-7244
1820-5940
1820-5944
1990-1552
1820-8830
1820-5937
1820-4998
1820-5943
1821-0559
3
1
1
2
1
IC TRANSCEIVER CMOS/HCT BUS OCTL
IC 256K-BIT SRAM 25-NS CMOS
IC MODULATOR ANLG 68 PIN PLCC
IC SCHMITT-TRIG CMOS/74AC INV HEX
IC GATE CMOS/74ACT AND QUAD 2-INP
74ACT32-GATE, QUAD 2-INPUT OR
OPTO-ISOLATOR LED-IC GATE IF=10MA-MAX
IC MUXR/DATA-SEL CMOS/ACT 8-TO-1-LINE
IC FF CMOS/74AC D-TYPE POS-EDGE-TRIG
IC GATE TTL/F OR QUAD 2-INP
IC MUXR/DATA-SEL CMOS/74ACT 2-TO-1-LINE
IC FF BICMOS/ABT D-TYPE POS-EDGE-TRIG
27014
04713
01295
27014
28480
07263
28480
04713
07263
27014
07263
01295
MM74HCT245WM
MCM6206DJ25
F107563FN
74AC14SC
1820-5940
02237
HCPL-2211-300
MC74ACT251D
02237
74F32SC
02237
SN74ABT16374ADL
122
Qty
1
3
2
2
1
1
2
1
Part Description
Chapter 7 Replaceable Parts
33120-66521 – Main PC Assembly
Reference
Designator
Agilent Part
Number
U301-U302
U303
U304
U305
U306-U307
U314
U315
U401
U402-U403
U404-U405
1821-0964
1826-2793
1821-0434
1820-5790
1826-1622
1826-1622
1820-5943
1820-6524
1820-8461
1818-4983
U407
U409
U410
U411
U412
U413
U601-U602
U603
U604
U620
1826-3517
1826-1619
1826-1622
1820-4377
1820-5732
1813-0861
1821-0434
1826-2797
1820-8830
1826-1950
U621
U702
U901
U902
U903
U904
U906
U907
U908
U1001
1821-0622
1826-1991
1990-1552
1820-7244
34401-88842
1821-1721
1820-7662
1820-6176
1820-6175
1826-0527
U1002
U1003
U1004
U1006
U1007
U1051
U1052
1826-0393
1826-0527
1826-1597
1826-2264
1826-2801
1826-2794
1826-2264
XJ601
XJ801
3050-0447
3050-0447
XQ713
XQ718
Y101
Y901
Qty
2
1
3
1
4
Part Description
Mfr.
Code
Mfr. Part
Number
IC DRVR 8X S 20SOL 45V 250MA
IC DA VOUT SER 16SOL 16BIT AD1851R
IC ANLG-MUXR/DEMUXR CMOS/HC 8-CHAN
IC SHF-RGTR CMOS/74HC SYNCHRO SERIAL-IN
IC OP AMP LOW-BIAS-H-IMPD QUAD 14 PIN
IC OP AMP LOW-BIAS-H-IMPD QUAD 14 PIN
IC MUXR/DATA-SEL CMOS/74ACT 2-TO-1-LINE
IC XLTR ECL/10KH TTL-TO-ECL QUAD
IC FF BICMOS/ABT D-TYPE POS-EDGE-TRIG
IC 256K-BIT SRAM 15-NS CMOS
01295
24355
18324
18324
04713
04713
07263
04713
01295
28480
TPIC6595DW
AD1851R
74HC4051D
74HC4094D
TL074CD
TL074CD
02237
MC10H124FN
SN74ABT574ADW
1818-4983
D/A 12-BIT 28-PLCC MISC
D/A 8-BIT 20-PLCC CMOS
IC OP AMP LOW-BIAS-H-IMPD QUAD 14 PIN
IC GATE TTL/F NAND QUAD 2-INP
IC LCH CMOS/74HC D-TYPE OCTL
CLOCK-OSCILLATOR-XTAL 40.000-MHZ 0.01%
IC ANLG-MUXR/DEMUXR CMOS/HC 8-CHAN
IC MULTIPLIER HS 14 PIN DIP-P
IC MUXR/DATA-SEL CMOS/ACT 8-TO-1-LINE
IC COMPARATOR HS SGL 8 PIN PLSTC-SOIC
28480
24355
04713
27014
04713
28480
18324
24355
04713
28480
1826-3517
AD7528JP
TL074CD
74F00SC
MC74HC573ADW
1813-0861
74HC4051D
AD734AN
MC74ACT251D
1826-1950
IC DRVR BICMOS/ABT LINE OCTL
IC OP AMP HS SINGLE 8 PIN PLSTC-SOIC
OPTO-ISOLATOR LED-IC GATE IF=10MA-MAX
IC SCHMITT-TRIG CMOS/74AC INV HEX
IC, ROM PROGRAMMED
IC GPIB CONTROLLER
IC-INTERFACE DRVR/RCVR BIPOLAR DUAL
IC-INTERFACE XCVR BIPOLAR BUS OCTL
IC-INTERFACE XCVR BIPOLAR BUS OCTL
IC V RGLTR-ADJ-NEG 1.2/37V 3-TO-220 PKG
18324
24355
28480
27014
28480
01295
28480
01295
01295
27014
74ABT540D
AD711JR
HCPL-2211-300
74AC14SC
34401-88842
MP9914FNL
1820-7662
SN75ALS160DW
SN75ALS162DW
LM337T
IC V RGLTR-ADJ-POS 1.2/37V 3-TO-220 PKG
IC V RGLTR-ADJ-NEG 1.2/37V 3-TO-220 PKG
IC V RGLTR-FXD-POS 4.85/5.15V TO-220 PKG
IC PWR MGT-UND-V-SEN 8 PINS P-SOIC PKG
IC V RGLTR-OV-V-SEN 8-P-SOIC PKG
IC V RGLTR-FXD-POS 4.85/5.15V 3-TO-220
IC PWR MGT-UND-V-SEN 8 PINS P-SOIC PKG
27014
27014
27014
04713
04713
27014
04713
LM317
LM337T
LM2940CT
MC34064D-5
MC3423D
LM2490CT-5.0-LB01
MC34064D-5
2
WASHER-FL NM NO. 8 .192-IN-ID .37-IN-OD
WASHER-FL NM NO. 8 .192-IN-ID .37-IN-OD
28480 3050-0447
28480 3050-0447
1200-0181
1200-0181
2
INSULATOR-XSTR NYLON
INSULATOR-XSTR NYLON
13103 7717-5-N
13103 7717-5-N
0410-4009
0410-4009
2
CERO-RES 12 MHZ +1-0.8%
CERO-RES 12 MHZ +1-0.8%
28480 0410-4009
28480 0410-4009
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
2
1
1
7
123
Chapter 7 Replaceable Parts
33120-66502 – Display and Keyboard PC Assembly
33120-66502 – Display and Keyboard PC Assembly
Reference
Designator
Agilent Part
Number
C1101
C1102-1103
C1104
C1105
C1201-1203
C1301-1302
C1303-1304
C1305-1310
0160-5945
0180-3751
0160-6497
0160-5947
0160-6497
0160-5947
0160-5945
0160-6497
3
10
3
CAP-FXD 0.01 uF 50 V
CAP-FXD 1 uF 35 V TA
CAP-FXD 0.1 uF 25 V
CAP-FXD 1000 pF 50 V
CAP-FXD 0.1 uF 25 V
CAP-FXD 1000 pF 50 V
CAP-FXD 0.01 uF 50 V
CAP-FXD 0.1 uF 25 V A
04222
S0545
04222
04222
04222
04222
04222
04222
08055C103KAT A
NRS105M35R8
12065C104KAT A
08055C102KAT A
12065C104KAT A
08055C102KAT A
08055C103KAT A
12065C104KAT A
CR1101
CR1102
CR1105
J1301
L1301
M1301
1906-0291
1906-0395
1902-1542
34401-61602
9170-1431
33120-00611
1
1
1
1
1
1
DIODE- 70 V 100 MA
DIO SIG 2X SOT143L 75V 215MA 2PF
DIODE-ZNR 6.2V 5% TO-236 (SOT-23)
DISPLAY CABLE ASSY, 8.8L
SHIELDING CORE, BEADS
SHIELD-ESD
04713
25403
04713
28480
28480
28480
MBAV99
BAS28
BZX84C6V2
34401-61602
9170-1431
33120-00611
R1101
R1102
R1103-1106
R1107
R1108
R1109
R1301-1304
R1305-1306
R1307-1308
R1309
0699-1399
0699-1391
0699-1344
0699-1391
0699-1378
0699-1435
0699-1423
0699-1391
0699-1330
0699-1399
2
4
4
2
1
RESISTOR 23.7K +-1% .125W TKF TC=0+-100
RESISTOR 10K +-1% .125W TKF TC=0+-100
RESISTOR 10 +-1% .125 W TKF TC=0+-100
RESISTOR 10K +-1% .125W TKF TC=0+-100
RESISTOR 2.61K +-1% .125W TKF TC=0+-100
RESISTOR 681 +-1% .125W TKF TC=0+-100
RESISTOR 215 +-1% .125W TKF TC=0+-100
RESISTOR 10K +-1% .125W TKF TC=0+-100
RESISTOR 100K +-1% .125W TKF TC=0+-100
RESISTOR 23.7K +-1% .125W TKF TC=0+-100
2M627
2M627
28480
2M627
2M627
2M627
2M627
2M627
2M627
2M627
MCR18FX
MCR18FX
0699-1344
MCR18FX
MCR18FX
MCR18FX
MCR18FX
MCR18FX
MCR18FX
MCR18FX
S1119
U1101
U1102
U1103
U1201
U1202
U1203
U1204
U1301
U1302
Y1101
0960-0892
33120-88813
1826-1402
1826-2264
1820-5562
1820-4966
1820-5330
33120-89301
1826-1528
1820-6756
0410-4009
1
1
1
1
1
1
1
1
1
1
ROTARY ENCODER
87C51 PROG
IC-V RGLTR-FXD-POS 4.8/5.2V 8-P-SOIC PKG
IC-PWR MGT-UND-V-SEN 8 PINS P-SOIC PKG
74HC02-GATE, QUAD 2-INPUT NOR INPUT
IC-FF CMOS/74HC D-TYPE POS-EDGE-TRIG
IC-INTERFACE DRIVER BIPOLAR DISPLAY
VACUUM FLUORESCENT DISPLAY
IC-COMPARATOR LP QUAD 14 PIN PLSTC-SOIC
IC-SHIFT-REGISTER CMOS/74HC BIDIR
CERO-RES 12 MHZ +1-0.8%
28480
28480
04713
04713
01295
01295
01295
28480
27014
04713
28480
0960-0892
33120-88813
MC78L05ACD
MC34064D-5
SN74HC02D
SN74HC74D
SN75518FN
33120-89301
LM339M
MC74HC299D
0410-4009
Qty
1
1
4
124
Part Description
Mfr.
Code
Mfr. Part
Number
Chapter 7 Replaceable Parts
33120A Mainframe
33120A Mainframe
Reference
Designator
Agilent Part
Number
Qty
Mfr.
Code
Mfr. Part
Number
A1
A2
B1
CBL1-CBL2
CBL4
CD1
CVR1
F1
FRM1
33120-66521
33120-66502
3160-0847
33120-61601
RS232-61601
33250-13603
33120-84131
2110-0458
33120-80111
1
1
1
2
1
1
1
1
1
MAIN PC ASSEMBLY
DISPLAY AND KEYBOARD PC ASSEMBLY
FAN-TBAX 12V 5.3-CFM NOM
CABLE BNC
RS-232 CABLE
AGILENT INTUILINK ARB SOFTWARE CD
COVER
FUSE-500 MAT
CHASSIS
28480
28480
11855
28480
28480
28480
28480
75915
28480
33120-66521
33120-66502
DFB0412L-SG
33120-61601
RS232-61601
33250-13603
33120-84131
239.500
33120-80111
HDW1
HDW2
HDW3
HDW4
KIT1
KYC1
KYC2
KYC3
0380-1820
0535-0154
3050-1547
34401-88304
34401-86010
33120-87411
34401-43711
34401-45011
1
1
1
1
1
1
1
1
SPACER, .438 IN LG, .280 IN OD
NUT-HEX SGL-CHAM M9.0 X 0.75 2MM-THK
WASHER-FL MTLC 9.0 9.2-MM-ID 14-MM-OD AL
REAR PANEL
BUMPERS (FRNT/REAR) & POWER MOD CVR
FRONT-PANEL KNOB
PUSH-ROD, POWER-ON
CARRYING HANDLE
28480
11239
11239
28480
28480
28480
28480
28480
0380-1820
3-9-03
4-9-01
34401-88304
34401-86010
33120-87411
34401-43711
33120-45011
MP2
PNL1
PS1
SCR1-SCR7
SCR8-SCR9
T1
WD1
33120-81911
33120-40211
33120-86201
0515-0433
0624-0862
9100-5090
33120-49321
1
1
1
7
2
1
1
FRONT-PANEL KEYPAD
FRONT-PANEL/BEZEL ASSEMBLY
POWER-MODULE/FUSE & FUSE DRWR
SCREW-M4 X 8MM LG PAN-HD
SCREW-TPG .750-IN-LG PAN-HD-PHL STL,1022
TRANSFORMER-PWR 100/120/220/240V
FRONT DISPLAY WINDOW
28480
28480
28480
28480
93907
08807
28480
33120-81911
33120-40211
33120-86201
0515-0433
225-44395-890
8470B45
33120-49321
Part Description
7
125
Chapter 7 Replaceable Parts
Manufacturer’s List
Manufacturer’s List
Mfr Code
00779
01295
02113
04222
04713
05971
07263
07933
08807
09021
11236
11239
11502
11855
13103
18324
20859
24355
24444
24226
25403
27014
27264
28480
32997
34335
34649
51406
71744
75915
76381
93907
2L446
2M627
S0545
S4217
Manufacturer’s Name
Manufacturer’s Address
Zip Code
Amp Inc
Texas Instruments Inc
Coilcraft Inc
AVX Corp
Motorola Inc
LYN-TRON Inc
Fairchild Semiconductor Corp
Raytheon Co Semiconductor Div Hq
MidwestCo Enterprises Inc
KOA Speer Electronics Inc
CTS Corp
Nobel Mercantile Co
IRC Inc
Delta Electronic Industries Co
Thermalloy Inc
Signetics Corp
Mellowes Co
Analog Devices Inc
General Semiconductor Ind Inc
Gowanda Electronics Corp
NV Philips Elcoma
National Semiconductor Corp
Molex Inc
Agilent Technologies, Inc.
Bourns Networks Inc
Advanced Micro Devices Inc
Intel Corp
Murata Corporation Of America
General Instrument Corp
Littelfuse Inc
3M Corp
Camcar Screw and Mfg Co
ADAC Screw Machine Products
Rohm Corp
NEC Electronics Inc
Nippon Chemi-Con Corp
Harrisburg, PA, U.S.A.
Dallas, TX, U.S.A.
Cary, IL, U.S.A.
Great Neck, NY, U.S.A.
Roselle, IL, U.S.A.
Burbank, CA, U.S.A.
Cupertino, CA, U.S.A.
Mountain View, CA, U.S.A.
Grayslake, IL, U.S.A.
Bradford, PA, U.S.A.
Elkhart, IN, U.S.A.
Alburquerque, NM, U.S.A.
Corpus Christi, TX, U.S.A.
Taipei, Taiwan
Dallas, TX, U.S.A.
Sunnyvale, CA, U.S.A.
Milwaukee, WI, U.S.A.
Norwood, MA, U.S.A.
Tempe, AZ, U.S.A.
Gowanda, NY, U.S.A.
Eindhoven, Netherlands
Santa Clara, CA, U.S.A.
Lisle, IL, U.S.A.
Palo Alto, CA, U.S.A.
Riverside, CA, U.S.A.
Sunnyvale, CA, U.S.A.
Santa Clara, CA, U.S.A.
Marietta, GA, U.S.A.
Clifton, NJ, U.S.A.
Des Plaines, IL, U.S.A.
St. Paul, MN, U.S.A
Rockford, IL, U.S.A.
Redwood City, CA, U.S.A.
Kyoto 615, JAPAN
Mountain View, CA, U.S.A.
Ohme-shi Tokyo, JAPAN
17111
75265
60013
11021
60195
91505
95014
94040
60030
16701
46514
87109
78411
126
75234
94086
53212
02062
85281
14070
02876
95052
60532
94303
92507
94086
95054
30067
07012
60016
55144
61101
94063
94043
8
Schematics
8
Schematics
œ 33120A Block Diagram . . . . . . . . . . . . . . . . . 129
œ Mechanical Disasembly . . . . . . . . . . . . . . . . . 130
œ Floating Logic Schematic . . . . . . . . . . . . . . . . 131
œ Digital Waveform Data Synthesis Schematic . . . . . 132
œ System DAC Schematic . . . . . . . . . . . . . . . . . 133
œ Waveform DAC Schematic . . . . . . . . . . . . . . . 134
œ Filters Schematic . . . . . . . . . . . . . . . . . . . . 135
œ Sync, Square Wave, and Attenuator Schematic . . . . 136
œ Output Amplifier Schematic . . . . . . . . . . . . . . 137
œ Output Attenuator Schematic
. . . . . . . . . . . . . 138
œ Earth Reference Logic Schematic . . . . . . . . . . . . 139
œ Power Supplies Schematic . . . . . . . . . . . . . . . 140
œ Display and Keyboard Schematic . . . . . . . . . . . . 141
œ 33120-66521 Component Locator Diagram
. . . . . . 142
œ 33120-66502 Component Locator Diagram
. . . . . . 143
You may notice parts labeled as “No Load” on several schematics.
These are parts that were included in the original design but were
removed later to enhance performance or reduce cost.
128
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Block Diagram
129
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Pull Off Handle
Pull Off Bumpers
Loosen
Captive
Screws
Slide Off Outer Case
Remove Bottom Screw
Pull To
Remove
Pry Outward
From This Side
Press Down To
Unlatch Cable
Pull Up To
Disconnect
Remove Screw
Front Panel
Will Pull Off
Mechanical Disassembly
130
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
33120-66521 (sheet 1 of 10)
Floating Logic Schematic
131
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
33120-66521 (sheet 2 of 10)
Digital Waveform Data Synthesis Schematic
132
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
33120-66521 (sheet 3 of 10)
System DAC Schematic
133
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
33120-66521 (sheet 4 of 10)
Waveform DAC Schematic
134
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
33120-66521 (sheet 5 of 10)
Filters Schematic
135
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
33120-66521 (sheet 6 of 10)
Sync, Square Wave, and Attenuator Schematic
136
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
33120-66521 (sheet 7 of 10)
Output Amplifier Schematic
137
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
33120-66521 (sheet 8 of 10)
Output Attenuator Schematic
138
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
33120-66521 (sheet 9 of 10)
Earth Reference Logic Schematic
139
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
33120-66521 (sheet 10 of 10)
Power Supplies Schematic
140
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
33120-66502 (sheet 1 of 1)
Display and Keyboard Schematic
141
Ô Binder Edge (RH Page)
Foldout Cut Size = 9 x 19 inches
Fold Here
Fold Here
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
TOP SIDE 33120-66521 REV A
33120-66521 Component Locator Diagram
142
Fold Here
Fold Here
Õ
Binder Edge (LH Page)
Foldout Cut Size = 9 x 19 inches
TOP SIDE 33120-66502 REV C
33120-66502 Component Locator Diagram
143
 Copyright Agilent Technologies, Inc.
1994-2002
No part of this manual may be reproduced in any form or by any means
(including electronic storage and
retrieval or translation into a foreign
language) without prior agreement
and written consent from Agilent
Technologies as governed by the
United States and international
copyright laws.
Manual Part Number
33120-90017, March 2002
(order as 33120-90104 manual set)
Edition
Edition 6, March 2002
Edition 5, August 1997
Edition 4, February 1996
Edition 3, May 1994
Edition 2, March 1994
Edition 1, January 1994
Printed in Malaysia
Agilent Technologies, Inc.
815 14th Street S.W.
Loveland, Colorado 80537 U.S.A.
Warranty
Safety Notices
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agreement with warranty terms
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It calls attention to an operating procedure, practice, or the like that, if not
correctly performed or adhered to,
could result in personal injury or death.
Do not proceed beyond a WARNING
notice until the indicated conditions
are fully understood and met.
CAUTION
A CAUTION notice denotes a hazard.
It calls attention to an operating procedure, practice, or the like that, if not
correctly performed or adhered to,
could result in damage to the product
or loss of important data. Do not
proceed beyond a CAUTION notice
until the indicated conditions are
fully understood and met.
Earth ground symbol.
Chassis ground symbol.
WARNING
Only qualified, service-trained personnel who are aware of the hazards
involved should remove the cover from
the instrument.
WARNING
For continued protection against fire,
replace the line fuse only with a fuse
of the specified type and rating.
Inside Front Cover (English Service Guide)