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Agilent 34980A
Multifunction
Switch/Measure Unit
Service Guide
Agilent Technologies
Notices
© Agilent Technologies, Inc. 2006, 2011,
2012, 2013
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, Inc. as governed
by United States and international copyright laws.
Manual Part Number
34980-90010
Edition
Sixth Edition, September 2013
Printed in Malaysia
Agilent Technologies, Inc.
3501 Stevens Creek Blvd
Santa Clara, CA 95052 USA
Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation.
Warranty
The material contained in this document is provided “as is,” and is subject to being changed, without notice, in future editions. Further, to the maximum extent permitted by applicable law, Agilent disclaims all warranties, either express or implied, with regard to this manual and any information contained herein, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Agilent shall not be liable for errors or for incidental or consequential damages in connection with the furnishing, use, or performance of this document or of any information contained herein.
Should Agilent and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms, the warranty terms in the separate agreement shall control.
Technology Licenses
The hardware and/or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license.
Safety Notices
C A U T I O N
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.
WA R N I N G
A WARNING 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 personal injury or death. Do not proceed beyond a
WARNING notice until the indicated conditions are fully understood and met.
Software Revision
This guide is valid for the firmware that was installed in the instrument at the time of manufacture. However, upgrading the firmware may add or change product
features. For the latest firmware and
documentation, go to the product page at: www.agilent.com/find/34980A
Restricted Rights Legend
U.S. Government Restricted Rights.
Software and technical data rights granted to the federal government include only those rights customarily provided to end user customers. Agilent provides this
customary commercial license in Software and technical data pursuant to FAR
12.211 (Technical Data) and 12.212
(Computer Software) and, for the Department of Defense, DFARS 252.227-7015
(Technical Data - Commercial Items) and
DFARS 227.7202-3 (Rights in Commercial Computer Software or Computer
Software
Documentation).
i
ii
Additional Safety Notices
The following general safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or with specific warnings or instructions elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent
Technologies assumes no liability of the customer’s failure to comply with the requirements.
General
Do not use this products in any manner not specified by the manufacturer. The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions.
Do Not Modify the
Instrument
Do not install substitute parts or perform any unauthorized modification to the product. Return the product to an Agilent
Sales and Service Office for service and repair to ensure that safety features are maintained.
In Case of Damage
Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel.
Safety Symbols
Before Applying Power
Verify that all safety precautions are taken. Make all connections to the unit before applying power.
Alternating current
Frame or chassis terminal
Ground the Instrument
This product is provided with protective earth terminals. To minimize shock hazard, the instrument must be connected to the ac power mains through a grounded power cable, with the ground wire firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.
Standby supply. Unit is not completely disconnected from ac mains when switch is off
Caution, risk of electric shock
Caution, refer to accompanying
Do Not Operate in an Explosive
Atmosphere
Do not operate the instrument in the presence of flammable gases or fumes.
Waste Electrical and Electronic
Equipment (WEEE) Directive
2002/96/EC
This product complies with the WEEE
Directive (2002/96/EC) marking requirement. The affixed product label (see above) indicates that you must not dis- card this electrical/electronic product
in domestic household waste.
Product Category: With reference to the equipment types in the WEEE directive
Annex 1, this product is classified as a
“Monitoring and Control instrumentation” product.
To return unwanted products, contact
your local Agilent office, or go to
www.agilent.com/environment/product for more information.
Technical Support
If you have questions about your shipment, or if you need information about warranty, service, or technical support, contact
Agilent Technologies:
In the United States: (800) 829-4444
In Europe: 31 20 547 2111
In Japan: 0120-421-345
Or go to www.agilent.com/find/assist
for information on contacting Agilent in your country of specific location. You can also contact your Agilent Technologies
Representative.
Do Not Remove the Instrument
Cover
Only qualified, service-trained personal who are aware of the hazards involved should remove instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover.
iii
Front Panel at a Glance
1 On/Standby switch WARNINGs.
. This switch is standby only. To disconnect the mains from the instrument, remove the power cord.
2 Utility menu contains settings for Remote I/O (LAN, GPIB, and USB), Date and Time, and other system-related instrument parameters
3 Store/recall menu allows you to save and recall up to six instrument setups
4 Control keys directly control module actions
5 Number keypad enters numerical characters
6 Exponent
7 Cancel key exits a menu without saving changes
8 Arrow keys move cursor positions
9 Knob enters alphanumeric characters, selects slots, channels, and navigates menus
10 Enter key steps you through a menu or saves number entries
11 Running a program puts the display into “remote” and disables the front panel keys. Local takes you out of “remote” mode and enables the front panel keys.
12 Configure keys select functions and set function parameters
13 Measure keys execute and monitor measurements. Depending on which measurement key you use, you can have complete/direct control over the switching and measurement operation, or you can have the
34980A automatically control these to capture the desired data.
34980A Service Guide iv
Rear Panel at a Glance
v
1 Access to Analog Buses (shown with cover installed). For pinout, see
.
2 Module installed in slot 1
3 Slot identifier
4 Module ground screw
5 Slot cover over slot 2
6 AC power connector
7 LAN connector (10Base T/100Base Tx)
8 USB 2.0 connector
9
External trigger input. For pinout, see page vi
.
10 Internal DMM option mark. If you ordered the internal DMM option, the circle is marked black.
11 IEEE 488.2 GPIB Connector
12 Chassis ground screw
34980A Service Guide
Rear Panel Connector Pinouts
External Trigger/Alarms Connector (Male D-Sub)
Input
5 V
0 V
6
1
9
5
Ext Trig Input /
Chan Adv Input (Pin 6)
Gnd (Pin 9)
Chan Closed Output /
VM Comp Output (Pin 5)
3.3 V
0 V
> 1 μs
Output
Approx. 2 μs or
Alarm 1 Output (Pin 1)
Alarm 2 Output (Pin 2)
Alarm 3 Output (Pin 3)
Alarm 4 Output (Pin 4)
Gnd (Pin 9)
Analog Bus Connector (Female D-Sub)
ANALOG
BUSSES
9
5
ABus1 HI (Pin 9)
ABus2 HI (Pin 8)
ABus3 HI (Pin 7)
ABus4 HI (Pin 6)
6
1
Internal DMM Current Input
I (Pin 5)
ABus1 LO (Pin 4)
ABus2 LO (Pin 3)
ABus3 LO (Pin 2)
ABus4 LO (Pin 1)
34980A Service Guide vi
Annunciator Display Indicators
Mx+B
4W
OC
* vii
Display Indicator
LAN
USB
GPIB
ABUS [1234]
ERRO
Rmt
Safety Interlock
Trig
HO
ALARM (H1234L)
Definition
Communicating with the 34980A over LAN.
Communicating with the 34980A over USB.
Communicating with the 34980A over GPIB.
Analog Bus Connectivity. Normally, designated ABus connected on any module in mainframe.
During scan, if ABus 1 and ABus 2 are indicated, they will be used at some point during the scan.
An error has been generated and is in the error queue.
Remote. Running a program puts the display into “remote” and disables the front panel keys.
Pressing the LOCAL button takes you out of “remote” mode and enables the front panel keys.
ABus Safety Interlock. Terminal block or cables have been removed from the D-sub connector of a module. For more information, see the Agilent 34980A User’s Guide.
Waiting for external or manual trigger during scans.
Over-temperature condition. One or more general purpose (34937A/34938A) modules have reached their over-temperature limits.
HI or LO alarm condition has occurred on the indicated alarms.
Alarms are enabled on the displayed channel.
Scaling enabled on channel. This appears on display after you select scaling function via front panel or remote interface.
4-wire measurement specified on channel. This appears on display after you select the 4-wire function via the front panel or remote interface.
Offset Compensation specified on channel. This appears on display after you have selected the offset compensation function via the front panel or remote interface.
Measurement is in progress.
34980A Service Guide
Front Panel Menu Reference
This section gives an overview of the top two levels of menus that you access from the front panel. The menus are designed to automatically guide you through all parameters required to configure a particular function or operation.
Store/Recall
Store and recall instrument states
• Store up to six instrument states in non-volatile memory
• Assign a name to each storage location.
• Recall stored states, power-down state, factory reset state, or preset state
Utility
Configure system-related instrument parameters
• Connecting and configuring to use with LAN, GPIB, or USB
• Set the real time clock and calendar
• Set radix character, thousand separator
• Enable/disable the internal DMM
• Query and update the firmware revisions for the mainframe and modules
Configure Key Group
Set parameters for measurement
DMM
• Set DMM measurement function (AC volts, DC volts, AC current, DC current, 2-wire ohms, 4-wire ohms, temperature, frequency, and period)
• Set function parameters
Channel
• Set channel measurement function (AC volts, DC volts, AC current (34921A only), DC current (34921A only) 2-wire ohms, 4-wire ohms, temperature, frequency, and period)
• Set function parameters
Scan
• Set up trigger-in parameters
• Set up sweep count
• Set up sample count
Sequence
• View sequence command string
• Execute sequence
• Delete sequence definitions
Module
• Open all relays
• Clear all measurement functions
• Clear channel labels
• Configure external trigger and clock (34951A)
• Set trace or level mode (34951A)
• Set waveform parameters (34951A)
View
• View errors and alarms
34980A Service Guide viii
Advanced
Available at a later firmware release
Alarm
• Select one of four alarms to report alarm conditions on the displayed channel
• Configure a high limit, a low limit, or both for the displayed channel
• Select the slope (rising or falling edge) for the four alarm output lines ix 34980A Service Guide
Instrument Rack Mounting
Using the optional Agilent Y1130A Rack Mount Kit, you can mount the
34980A in a standard 19- inch rack cabinet. This kit includes rack mount brackets and associated hardware required to forward or reverse mount the instrument in the rack cabinet.
• For forward rack mounting (34980A front panel facing the front of
the cabinet), use the Agilent standard rack mount kit (part number
5063- 9214). For Agilent rack cabinets, use the E3663A Basic Rail Kit
(sold separately).
• For reverse rack mounting (34980A rear panel facing the front of
the cabinet), use the longer brackets (see figure below) with the hardware for the standard rack mount kit. For Agilent rack cabinets, use the E3664AC Third Party Rail Kit (sold separately).
Reverse Rack Mount Orientation (longer brackets used)
34980A Service Guide x
xi
425.6 mm (16.76 in)
367.7 mm (14.48 in)
101.9 mm (4.01 in)
or
70.4 mm (2.78 in)
Agilent 34980A Dimensions (shown with Reverse Rack Mount brackets installed)
34980A Service Guide
Contents
Front Panel at a Glance iii
v
Annunciator Display Indicators vi
Front Panel Menu Reference vii
vii
1 Obtaining Service
6
6
7
8
Electrostatic Discharge (ESD) Precautions 9
Multiplexer Module Specifications and Characteristics 12
Matrix Modules Specifications and Characteristics
14
GP Actuator Module Specifications and Characteristics 16
RF and Microwave Module Specifications and Characteristics 17
34945A/34945EXT Module Specifications and Characteristics 19
34950A 64-channel Digital I/O Specifications and Characteristics 20
34951A 4-channel D/A Converter Specifications and Characteristics
22
34952A Multifunction Module Specifications and Characteristics 24
34959A Breadboard Module Specifications and Characteristics 25
Internal DMM Specifications and Characteristics 26
Internal DMM Measurement Characteristics 31
System Specifications and Characteristics 35
37
To Calculate Total DMM Measurement Error
38
Interpreting Internal DMM Specifications 40
Configuring for Highest Accuracy Measurements 42
34980A Service Guide 1
2
Agilent Technologies Calibration Services
44
44
45
Automating Calibration Procedures
45
47
48
Aborting a Calibration in Progress 49
Performance Verification Tests 50
52
53
Internal DMM Verification Tests
53
Optional AC Performance Verification Tests 59
Plug-in Module Test Considerations
65
34951A 4-Ch Isolated DAC Module 66
71
Thermocouple Reference Junction 34921A (Optional) 75
34980A Service Guide
4 Troubleshooting and Diagnostics
78
Isolate a Problem with a Plug-In Module
90
34921A 40-Channel Armature Multiplexer with Low Thermal Offset 92
34922A 70-Channel Armature Multiplexer
94
34923A 40/80-Channel Reed Multiplexer 96
34924A 70-Channel Reed Multiplexer 98
34925A 40/80-Channel Optically-Isolated FET Multiplexer 100
34931A Dual 4x8 Armature Matrix
102
34932A Dual 4x16 Armature Matrix 104
34933A Dual/Quad 4x8 Reed Matrix
107
111
34938A 20-Channel High-Current GP Switch 112
Electrostatic Discharge (ESD) Precautions
114
114
116
117
118
122
34980A Service Guide 3
4
124
124
Mainframe Replaceable Parts 125
34946A and 34947A Replaceable Parts 131
131
136
137
138
139
34925A Component Locator (Top) 140
34925A Component Locator (Bottom) 141
142
143
144
145
146
34980A Service Guide
Agilent 34980A Multifunction Switch/Measure Unit
Service Guide
1
Obtaining Service
Electrostatic Discharge (ESD) Precautions 9
Agilent Technologies
5
6
1 Obtaining Service
Obtaining Service
Operating Checklist
Before returning your instrument to Agilent for service or repair check the following items:
Is the instrument inoperative?
q Verify that the power cord is connected to the instrument and to ac line power.
q Verify the front panel power switch is depressed.
Does the instrument fail self–test?
q Remove all test connections to the instrument and run the self–test again.
Errors may be induced by ac signals present on the instrument input terminals during self–test. Long test leads can act as an antenna causing pick–up of ac signals.
Types of Service Available
If your instrument fails during the warranty period, Agilent Technologies will repair or replace it under the terms of your warranty. After your warranty expires, Agilent offers repair services at competitive prices.
Extended Service Contracts
Many Agilent products are available with optional service contracts that extend the covered period after the standard warranty expires. If you have such a service contract and your instrument fails during the covered period, Agilent Technologies will repair or replace it in accordance with the contract.
34980A Service Guide
Obtaining Service 1
Repackaging for Shipment
If the unit is to be shipped to Agilent for service or repair, be sure to:
• Remove all accessories or plug- in modules from the mainframe.
• Attach a tag to the unit identifying the owner and indicating the required service or repair. Include the model number and full serial number.
• Place the unit in its original container with appropriate packaging material for shipping.
• 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
Obtaining Repair Service (Worldwide)
To obtain service for your instrument (in- warranty, under service contract, or post- warranty), contact your nearest Agilent Technologies Service
Center. They will arrange to have your unit repaired or replaced, and can provide warranty or repair- cost information where applicable.
To obtain warranty, service, or technical support information you can contact Agilent Technologies at one of the following telephone numbers:
In the United States: (800) 829- 4444
In Europe: 31 20 547 2111
In Japan: 0120- 421- 345
Or use our Web link for information on contacting Agilent worldwide: www.agilent.com/find/assist
Or contact your Agilent Technologies Representative.
Before shipping your instrument, ask the Agilent Technologies Service
Center to provide shipping instructions, including what components to ship. Agilent recommends that you retain the original shipping carton for use in such shipments.
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.
34980A Service Guide 7
1 Obtaining Service
8
Self Test Procedures
Power–On Self–Test
Each time the instrument is powered on, a subset of self–tests are performed. These tests check that the minimum set of logic and output hardware are functioning properly.
Complete Self–Test
To perform a complete self–test send the *TST?
command.
This command performs a complete self- test of the instrument and all installed plug- in modules and returns a pass/fail indication. The self- test runs a series of tests and, depending upon the modules installed, may take up to 2 minutes to complete (be sure to set an appropriate interface time out). If all tests pass, you can have a high confidence that the instrument and all installed plug- in modules are operational.
If the self–test is successful, SELF–TEST PASSED is displayed on the front panel.
If the self–test fails, SELF–TEST FAILED is displayed and an error number is shown. Self–test error numbers and their meaning are shown in the table on
N O T E
The self-test will abort if any signals are connected to ABus1 via the rear-panel Analog Bus connector (pins 4, 5, and 9). Be sure to disconnect any signals from ABus1 prior to running the self-test.
• On the 34945A Microwave Switch/Attenuator Driver, this command performs a self- test of the 34945A and all connected 34945EXT remote modules.
• If you have a 34951A Isolated DAC Module installed, the self- test
will require an additional 15 seconds to complete per DAC module
(a memory test is performed).
If one or more tests fail, return the instrument to Agilent for service.
Self Test Error Numbers
On the remote interface, a self–test failure will generate SCPI error –330 and a supplemental message indicating one of the test numbers shown in
.
Calibration Errors
The table on page 86 shows failures that may occur during a calibration.
34980A Service Guide
Obtaining Service 1
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 instrument or any electronic device.
• Disassemble instruments only in a static–free work area.
• Use a conductive work area to reduce static charges.
• Use a conductive wrist strap to reduce static charge accumulation.
• Minimize handling.
• Keep replacement parts in original static–free packaging.
• Remove all plastic, foam, vinyl, paper, and other static–generating materials from the immediate work area.
• Use only anti–static solder suckers.
34980A Service Guide 9
1 Obtaining Service
10 34980A Service Guide
Agilent 34980A Multifunction Switch/Measure Unit
Service Guide
2
Specifications
Multiplexer Module Specifications and Characteristics 12
Matrix Modules Specifications and Characteristics 14
GP Actuator Module Specifications and Characteristics 16
RF and Microwave Module Specifications and Characteristics 17
34945A/34945EXT Module Specifications and Characteristics 19
34950A 64-channel Digital I/O Specifications and Characteristics 20
34951A 4-channel D/A Converter Specifications and Characteristics 22
34952A Multifunction Module Specifications and Characteristics 24
34959A Breadboard Module Specifications and Characteristics 25
Internal DMM Specifications and Characteristics 26
Internal DMM Measurement Characteristics 31
System Specifications and Characteristics 34
To Calculate Total DMM Measurement Error 37
Interpreting Internal DMM Specifications 39
Configuring for Highest Accuracy Measurements 41
Agilent Technologies
11
2 Specifications
Multiplexer Module Specifications and Characteristics
Channels/configurations
34921A
40 2-wire
20 4-wire
4-current
1.5 A Fused
34922A
70 2-wire
35 4-wire
Switch type Armature latching
Input characteristics (per channel)
Max volts
Max current (DC, AC RMS)
Switch current
Carry current
Power (W, VA)
[5]
± 300 V
[1]
1 A
2 A
60 W
10
8
Volt-Hertz limit
Initial closed channel res
[3][10]
General specifications
Offset voltage
[3]
< 3
V
Armature latching
± 300 V
[1]
1 A
2 A
60 W
10
8
< 1.5
< 3
V
34923A
80 1-wire
40 2-wire
20 4-wire
Reed
± 150 V peak
0.5 A
[4]
1.5 A
[4]
[2]
/0.05 A
[9]
/0.05 A
[9]
34924A
70 2-wire
35 4-wire
Reed
± 150 V peak
[2]
0.5 A
[5]
/0.05 A
[9]
1.5 A
[5]
/0.05 A
[9]
10 W
10
8
< 1.5
5
/200
9
10 W
10
8
< 1.5
5
/200
9
< 50
V
DC Isolation (ch-ch, ch-earth)
Leakage current
[3]
T/C cold junction accuracy
[3, 8]
>10 G
N/A
< 1 °C
>10 G
N/A
N/A
< 50
V
< 100
V 1-wire
>10 G
N/A
N/A
>10 G
N/A
N/A
34925A
80 1-wire
40 2-wire
20 4-wire
Optically isolated
FET
± 80 V peak
[2]
0.02 A
[6]
1.6 W
10
7
< 700
< 3
V
>10 G
20 nA
[7]
N/A
[1]
DC or AC RMS voltage, channel-to-channel or channel-to-earth
[2]
Peak voltage, channel-to-channel or channel-to-earth
[3]
Into analog bus. System errors are included in the internal DMM measurement accuracy specifications.
[4]
With in-rush resistors bypassed. Bypassing resistors reduces lifetime of relays. See the rated load relay life characteristics.
[5]
Limited to 6 W of channel resistance power loss per module
[6]
DC or peak AC current
[7]
Ambient temperature < 30 ° C
[8]
Includes 0.5 ° C temperature reference sensor and 0.5 ° C terminal block isothermal gradient error. Measured under worst case loading of the mainframe. See 34980A User's Guide for information on supported external reference sensors.
[9]
With 100
input protection resistors.
[10]
Channel resistance is typically < 1.5
but can be as high as 50 when a channel is used in measurement applications with < 1 mA load current. Increased relay channel resistance for measurements with load currents below 1 mA can occur on cards that have been out of service or following relay inactivity for periods of greater than 1 week. Switching relays for 2k cycles prior to use typically corrects this problem. Agilent recommends the use of 4-wire ohms for resistance measurements and the Hi-Z input impedance configuration for voltage measurements. Applies to 34921A, 34922A, 34923A, and 34924A.
12 34980A Service Guide
Specifications 2
Multiplexer Module Specifications and Characteristics (continued)
34922A 34923A 34924A 34925A 34921A
AC characteristics
Bandwidth at terminal block
[1]
45 MHz 25 MHz 1 MHz
Crosstalk
at terminal block (ch-ch)
[1]
300 kHz
1 MHz
20 MHz
45 MHz
Capacitance at terminal block
HI-LO
LO earth
General characteristics
Relay life, typical
No
10 V, 100 mA
– 75 dB
– 75 dB
– 50 dB
– 40 dB
150 pF
150 pF
Scanning speeds
[3]
Open/ close time, typical
Analog bus backplane connection
100 M
10 M
100 k
100 ch/sec
4 ms/4 ms
Yes
– 75 dB
– 75 dB
– 50 dB
250 pF
200 pF
100 M
10 M
100 k
100 ch/sec
4 ms/4 ms
Yes
45 MHz
[2]
/4 MHz
10 MHz 1-wire
25 MHz
[2]
/4
MHz
[4]
–
–
–
75 dB
75 dB
50 dB
– 40 dB
130 pF
120 pF
– 75 dB
– 70 dB
– 45 dB
200 pF
170 pF
1000 M
10 M
10 k
500 ch/sec
0.5 ms/0.5 ms
Yes
1000 M
10 M
10 k
500 ch/sec
0.5 ms/0.5 ms
Yes
N/A
100 pF
300 pF
(600 pF 1-wire)
Unlimited
Unlimited
Unlimited
1000 ch/sec
0.25 ms/0.25 ms
Yes
[1]
50
source, 50
load, differential measurements verified with 4-port network analyzer (Sdd21)
[2]
With in-rush resistors bypassed. Bypassing resistors reduces lifetime of relays. See the rated load relay life characteristics.
[3]
Speeds are for 4½ digits, delay 0, display off, autozero off, and within bank.
[4]
With 100
input protection resistors.
34980A Service Guide 13
2 Specifications
Matrix Modules Specifications and Characteristics
Channels/configurations
34931A dual 4x8
8x8, 4x16
34932A dual 4x16
8x16, 4x32
Armature latching
34933A dual 4x8, 8x8
4x16, quad 4x8,
1-wire
Reed
non-latching
Switch type Armature latching
Input characteristics (per channel)
Max volts
Max current (DC, AC RMS)
Switch current
Carry current
Power (W, VA)
[2, 5]
Volt-Hertz limit
Initial closed channel res
[3]
General Specifications
Offset voltage
[3]
± 300 V
[1]
1 A
2 A
60 W
10
8
< 1.5
< 3
V
DC Isolation (ch-ch, ch-earth) >10 G
± 300 V
[1]
1 A
2 A
60 W
10
8
< 1.5
< 3
V
>10 G
< 50
V
< 100
V 1-wire
>10 G
34934A quad 4x32, 4x128,
8x64,16x32
Reed
non-latching
± 150 V peak
[2]
0.5 A
[4]
/0.05 A
[7]
1.5 A
[4]
/0.05 A
[7]
± 100 V peak
0.5 A
0.5 A
10 W
[6]
10
8
10 W
10
8
< 1.5
[4]
/200
[7]
< 1
/100
< 20
V
< 50
V 1-wire
10 G
[1]
DC or AC RMS voltage, channel-to-channel or channel-to-earth
[2]
Peak voltage, channel-to-channel or channel-to-earth
[3]
Into analog bus. System errors are included in the internal DMM measurement accuracy specifications.
[4]
With in-rush resistors bypassed. Bypassing resistors reduces lifetime of relays. See the rated load relay life characteristics.
[5]
Limited to 6 W channel resistance power loss per module
[6]
Power restrictions allow only 20 channels to be closed at one time.
[7]
With 100
input protection resistors.
[10]
Channel resistance is typically < 1.5
but can be as high as 50 when a channel is used in measurement applications with < 1 mA load current. Increased relay channel resistance for measurements with load currents below 1 mA can occur on cards that have been out of service or following relay inactivity for periods of greater than 1 week. Switching relays for 2k cycles prior to use typically corrects this problem. Agilent recommends the use of 4-wire ohms for resistance measurements and the Hi-Z input impedance configuration for voltage measurements. Applies to 34931A, 34932A.
14 34980A Service Guide
Specifications 2
Matrix Modules Specifications and Characteristics (continued)
34931A 34932A 34933A 34934A
AC characteristics
Bandwidth at terminal block
[1]
Crosstalk at terminal block (ch-ch)
[1]
300
1
Capacitance at terminal block
HI-LO
LO earth
General characteristics
Relay life, typical
No
10 V, 100 ma
Open/close time
Analog bus backplane connection
30 MHz
– 65 dB
– 55 dB
– 30 dB
50 pF
80 pF
100 M
10 M
100 k
4 ms/4 ms
Bank 2
30 MHz
– 65 dB
– 55 dB
– 30 dB
50 pF
80 pF
100 M
10 M
100 k
4 ms/4 ms
Bank 2
30 MHz
[2]
/4 MHz
[3]
2 MHz 1-wire
– 65 dB
– 55 dB
– 40 dB
80 pF
75 pF
35 MHz 2-wire
15 MHz 1-wire
– 65 dB
– 55 dB
– 33 dB
45 pF
250 pF
1000 M
10 M
10 k
0.5 ms/0.5 ms
Bank 2
1000 M operations
0.35 ms/0.10 ms
No
[1]
50
source, 50
load, differential measurements verified (Sdd21)
[2]
With in-rush resistors bypassed.
[3]
With 100
input protection resistors.
34980A Service Guide 15
2 Specifications
GP Actuator Module Specifications and Characteristics
34937A 34938A
20 Form A
4 Form A
Armature, latching Armature, latching Switch type
Input characteristics (per channel)
Max volts (DC, AC RMS)
[1]
Max current (DC, AC RMS)
Power (W, VA)
[2]
Volt-Hertz limit
General specifications
Offset voltage
Initial closed channel res
DC Isolation (ch-ch, ch-earth)
AC characteristics
Bandwidth at terminal block
[3]
Channel Isolation at terminal block
[3]
100 kHz
1 MHz
10 MHz
Capacitance at terminal block
CH - CH
CH - earth
General characteristics
Relay life no load/rated
Open/close time
Initial/reset relay state
3
V 3
Form C — 125 m
Form A — 50 m
> 10 G
< 60 m
> 10 G
10 MHz
55 dB
35 dB
15 dB
Form C 12 pF/ Form A 10 pF
Form C 21 pF/ Form A 18 pF
1 MHz
60 dB
40 dB
65 pF
105 pF
50 M/30 k
10 ms/10 ms
User configurable
Analog bus backplane connection
Form C — 300 V
Form A — 30 VDC/250 VAC
Form C —1 A switch (2 A carry)
Form A — 5 A switch (8 A carry)
Form C — 60 W
Form A — 150 W
10
8
Form C — 100 M/100 k
Form A — 50 M/30 k
Form C — 4 ms/4 ms
Form A — 10 ms/10 ms
Form C — maintain state
Form A — user configurable
No
30 VDC/250 VAC
5 A switch (8 A carry)
150 W
10
8
No
[1]
DC or AC RMS voltage, channel-to-channel or channel-to-earth.
[2]
Limited to 6 W of channel resistance power loss per module.
[3]
50
source, 50
load, differential measurements verified (S21).
16 34980A Service Guide
Specifications 2
RF and Microwave Module Specifications and Characteristics
Channels
Switch type
34941A
DC to 3 GHz
34942A 34946A quad 1x4 quad 1x4 2 SPDT
50
unterminated, latching relays
75
unterminated, latching relays
50
terminated
DC to 20 GHz
[2]
34947A
3 SPDT
50
unterminated
RF characteristics
Frequency range
[1]
DC to 3 GHz DC to 1.5 GHz DC to 4 GHz
or
DC to 20 GHz
DC to 4 GHz
or
DC to 20 GHz
DC to 4 GHz < 0.42 dB
@ 20 GHz < 0.69 dB
DC to 4 GHz < 0.42 dB
@ 20 GHz < 0.69 dB
Insertion loss
(< 40°C/80% RH)
[1]
100
1
0.15 dB
0.60 dB
1.40 dB
VSWR
100
1
Isolation (dB)
100
1
[1]
Spurious noise
below 1.3 GHz
1.03
1.25
1.55
Contact Factory
80 dB
58 dB
40 dB
–140 dBm
Risetime < 80 ps
Signal delay
Capacitance
< 1 ns
< 30 pF
0.15 dB
0.60 dB
N/A
1.15
1.35
N/A
Contact Factory
80 dB
60 dB
N/A
–140 dBm
< 160 ps
< 1 ns
< 30 pf
DC to 4 GHz < 1.15
@ 20 GHz < 1.30
DC to 4 GHz > 85 dB
@ 20 GHz > 67 dB
80 dB
N/A
N/A
N/A
DC to 4 GHz < 1.15
@ 20 GHz < 1.30
80 dB
N/A
N/A
N/A
DC to 4 GHz > 85 dB
@ 20 GHz > 67 dB
[1]
50
source, 50
load (75
for 34942A)
[2]
For more detailed specifications, see the N1810TL for the 34946A and N1810UL for the 34947A. The M9046A and M9047A requires N1810 Switch Options 124 (24 volt coils), 201 (D submin. 9-pin conn.), and 402 (Position Indicators)
34980A Service Guide 17
2 Specifications
RF and Microwave Module Specifications and Characteristics (continued)
34941A
Switching characteristics
Max volts
[1]
30 V
DC to 3 GHz
34942A 34946A
DC to 20 GHz
30 V 7 V DC
Max current
Max power (W) 10 W
Offset voltage
Initial channel resistance
0.5A
[4]
0.5A
10 W
[4]
N/A
1W @ 7 VDC,
50W peak
[3]
10
V 10
N/A
1
1
N/A
Volt-Hertz limit 2 x 10
10
2 x 10
10
General characteristics
Relay life 300,000 at 30V/10mA load;
100,000 at 10 W load
RF SAmeas
300,000 at 30V/10mA load;
100,000 at 10 W load
RF SAmeas
Open/Close time
18 ms / 18 ms 18 ms / 18 ms
> 5 M cycles,
1M w/drive
28-32VDC
< 15 ms / 15 ms
Connector type
Analog bus backplane connection
SMA
No
Mini 75
SMB
No
SMA
No
7 V DC
N/A
1W @ 7 VDC,
50W peak
[3]
N/A
N/A
SMA
No
[2]
34947A
> 5 M cycles,
1M w/drive
28-32VDC
< 15 ms / 15 ms
[1]
Channel-to-earth
[2]
For more detailed specifications, see the N1810TL for the 34946A and N1810UL for the 34947A. The M9046A and M9047A requires N1810 Switch Options 124 (24 volt coils), 201 (D submin. 9-pin conn.), and 402 (Position Indicators)
[3]
10
sec maximum duration
[4]
Max power is 1 W between 30 MHz and 1 GHz for CISPR 11 compliance
18 34980A Service Guide
34945A/34945EXT Module Specifications and Characteristics
34945EXT switch drive (64 channels, low side drive mode)
Driver off voltage (max)
Driver off leakage current
Driver on current (max)
30V
500
A
600 mA
Driver on voltage (max) 0.5 V @ 600 mA
34945EXT switch drive (64 channels, TTL drive mode)
Hi output voltage
Lo output voltage
Lo input Current
3 V @ I out
= 2 mA
0.4 V @ I in
= 20 mA
20 mA
34945EXT position indicator sense inputs
Channels
Lo input voltage (max)
64
0.8 V
Hi input voltage (min)
Input resistance
2.5 V
> 100 k
@ V in
> 20 k
@ V in
5 V
5 V
30 V Maximum input voltage
34945EXT switch drive power supply
(34945EXT powered by 34945A)
Voltage
Current
24 V nominal (external power supply required for switches needing more than 24 V)
100 mA continuous +
200 mA (15 msec pulse, 25% duty cycle)
34945EXT external power connection
Voltage range 4.75 V to 30 V
Current limit 2 A
LED indicators (current mode drivers)
Channels
Supply voltage
LED drive current
Compliance voltage
34945EXT Dimensions
64
5 V nominal
5 mA nominal
(programmable 1 to 20 mA)
0.8 V
11.2 x 4.5 x 1.5 inches high with
distribution boards installed
Specifications 2
34980A Service Guide 19
2 Specifications
34950A 64-channel Digital I/O Specifications and Characteristics
Digital input/output characteristics
Eight 8-bit channels: 8 bits wide, input or output, non-isolated
Vin 0 V – 5 V
[1]
Vout
Iout (max)
Frequency (max)
1.66 V – 5 V
[1]
24 mA
[2]
10 MHz
[3]
I load
(max) t rise
+ t fall
Output (typ)
400 mA
6 ns
[4]
OE
DOUT
VREF
Zo = 10
EN
2.5 pF
[1]
Configurable by 8-bit channel
[2]
Lower current drive at lower voltages
[3]
From memory with handshaking
[4]
5 V, 50pF load
DIN
+5V
+
VTHREF
1M
Active Drive:
Vin
Vout (L)
Vout (H)
0 V – 5 V
0.24 V < Vout < 0.55 V
4 mA < Iout < 24 mA
1.6 V < Vout < 5 V
-4 mA < Iout < -24 mA
14.7
10K
+5V
+5.1V
26.1
Vcc
Rpullup
I/O
1 of 64
Open Collector:
Vout
Vcc (< 2V)
Vcc (> 2V)
0 V – 5 V
-4 mA < Iout < -24 mA
215
< Rpullup < 1 k
215
< Rpullup < 10 k
20 34980A Service Guide
Specifications 2
34950A 64-channel Digital I/O Specifications and Characteristics (continued)
Handshake lines
Vin
Vout
I out (max)
0 V – 5 V
[1]
1.66 V – 5 V
[1,2]
24 mA
[2]
Frequency (max)
Counter function characteristics
10 MHz
Maximum frequency
Vin
10 MHz (max) 50% duty
0 V – 5 V
[3]
5
s
t rise /
t fall
Input (min)
Totalizer function characteristics
Maximum count
Maximum input frequency
2
32
– 1 (4,294,967,296)
10 MHz
rising or falling edge programmable
Vin
Gate input
0 V – 5 V
[3]
0 V – 5 V
System clock generator characteristics
[3]
Frequency
Vout
20 MHz – 10 Hz configurable
divide-by-n 24-bits, programmable on/off
1.66 V – 5 V
[2]
Accuracy 100 ppm
[1]
Configurable by bank
[2]
Lower current drive at lower voltages
[3]
Maximum threshold setting of 3V
34980A Service Guide 21
2 Specifications
34951A 4-channel D/A Converter Specifications and Characteristics
General specifications
Maximum update rate 200 kHz point-to-point
Isolation
Synchronization
Internal/external CLK accuracy
AC accuracy
DC voltage
Amplitude
Resolution
Amplitude accuracy (DC)
Ripple and noise
Settling time
Output impedance
DC current
Range
Resolution
Accuracy
Ripple and noise
Compliance voltage
Max open circuit voltage
> 80 VDC/AC peak (chan-to-chassis or chan-to-chan)
Software commands or external trigger
100 ppm
Not specified
± 16 V up to 10 mA
16-bits = 500
V
± (0.05% + 3.0 mV) 90 days, T cal
± 5
C or CAL:MOD? ± 5
C
< 2 mVrms, 20 Hz to 250 kHz into 10 k
load
40
S (–full scale to +full scale step, single channel, to rated accuracy)
< 1
with the load sensed
± 20 mA
16-bit = 630 nA
± (% value + amps) temperature within ± 5
C of T
90-day: ± (0.09% + 5.0
A) cal
or *CAL?
< 2
A rms
, 20 Hz to 250 kHz into 250
±12 V
< ± 22 V
22 34980A Service Guide
Specifications 2
34951A 4-channel D/A Converter Specifications and Characteristics (continued)
Phase-locking I/O trigger characteristics
Trigger input
Input level
Slope
TTL compatible (3.3 V logic, 5 V tolerant)
Rising or falling, selectable
Pulse width
Input impedance
Trigger output
Level
> 100 nS
> 10 k
, DC coupled
TTL compatible into 1 k
50
typical
(3.3 V logic)
Output impedance
Clock input
Input level
Input impedance
Maximum rate:
Clock output
TTL compatible (3.3 V logic, 5 V tolerant)
> 10 k
10 MHz
, DC
Level
Output impedance
Maximum rate
Accuracy
TTL compatible into 1 k
(3.3 V logic)
50
typical
10 MHz
± 100 ppm
34980A Service Guide 23
2 Specifications
34952A Multifunction Module Specifications and Characteristics
Digital input/output characteristics
Four 8-bits channels, 8 bits wide, input or output, non-isolated
Vin(L)
Vin(H)
< 0.8 V (TTL)
> 2.0 V (TTL)
Vout(L)
Vout(H)
Vin(H) (max)
Alarm
< 0.8 V @ Iout = –400 mA
> 2.4 V @ Iout = 1 mA
< 42 V with external open drain pull-up
Maskable pattern match or state change
Speed
Latency
Read/write speed
Totalize input characteristics
Max count
Totalize input
Signal level
Threshold
Gate input
Count reset
Read speed
Analog output characteristics
DAC 1, 2
4 ms (max) alarm sampling
5 ms (typical) to 34980A alarm output
95/s
2
26
– 1
100 kHz (max) rising or falling edge, programmable
1 Vp-p (min) 42 Vpk (max)
0 V or TTL
TTL-Hi, TTL-Lo, or none
Manual or read + reset
85 rds/s
± 12 V, non-isolated
IOUT
Settling time
Accuracy
Temperature coefficient
10 mA max
1 ms to 0.01% of output
± (% of output + mV)
1 year: ± (0.25% + 20 mV)
± (0.015% + 1mV)/°C
24 34980A Service Guide
34959A Breadboard Module Specifications and Characteristics
General specifications
Maximum module power dissipation 6 W
Power available
12 V regulation no load to full load
5 V regulation no load to full load
Maximum power from 12 V
Maximum power from 5 V
10%
5%
6 W
1 W
Relay drives
GPIO ports
28, sink up to 100 mA
Channel 1 and 2
Channel 3
Dimensions (L x W x H)
8 configure bits as input or output
3 output bits
5.4 x 7.5 x 0.9 inches (without PC board)
5.4 x 7.5 x 0.7 inches (with PC board)
Specifications 2
34980A Service Guide 25
2 Specifications
Internal DMM Specifications and Characteristics
DC and Resistance Specifications
Function
DC voltage
(with 34921A/
22A/25A/31A/32A)
[6]
Input impedance = Hi-Z
10 V range and below
DMM accuracy ± (% of reading + % of range). Includes measurement error, switching error [1] , and transducer conversion error.
Range
[4]
Test Current or
Burden Voltage
24 hour
[2,3]
Tcal ± 1 ° C
90 days
Tcal ± 5 ° C
1 year
Tcal ± 1 ° C
Temperature coefficient
Tcal ± 5 ° C
100.0000 mV
1.000000 V
10.00000 V
100.0000 V
300.0000 V
Resistance
[5]
100.0000
1.000000 k
10.00000 k
100.0000 k
1.000000 M
10.00000 M
100.0000 M
1mA
1mA
100
A
10
A
5.0
A
500nA
500nA/10M
DC current (34921 only) 10.00000 mA
100.0000 mA
1.000000 A
< 0.1 V burden
< 0.6V
< 2V
0.0030 + 0.0035
0.0020 + 0.0006
0.0015 + 0.0004
0.0030 + 0.0006
0.0030 + 0.0020
0.0040 + 0.0040
0.0030 + 0.0007
0.0020 + 0.0005
0.0045 + 0.0006
0.0045 + 0.0030
0.0050 + 0.0040
0.0040 + 0.0007
0.0035 + 0.0005
0.0055 + 0.0006
0.0055 + 0.0030
0.0005 + 0.0005
0.0005 + 0.0001
0.0005 + 0.0001
0.0005 + 0.0001
0.0005 + 0.0003
0.0030 + 0.0035
0.0020 + 0.0006
0.0020 + 0.0005
0.0020 + 0.0005
0.002 + 0.001
0.015 + 0.001
0.300 + 0.010
0.008 + 0.004
0.008 + 0.001
0.008 + 0.001
0.008 + 0.001
0.008 + 0.001
0.020 + 0.001
0.800 + 0.010
0.005 + 0.010
0.010 + 0.004
0.050 + 0.006
0.030 + 0.020
0.030 + 0.005
0.080 + 0.010
0.010 + 0.004
0.010 + 0.001
0.010 + 0.001
0.010 + 0.001
0.010 + 0.001
0.040 + 0.001
0.800 + 0.010
0.050 + 0.020
0.050 + 0.005
0.100 + 0.010
0.0006 + 0.0005
0.0006 + 0.0001
0.0006 + 0.0001
0.0006 + 0.0001
0.0010 + 0.0002
0.0030 + 0.0004
0.1500 + 0.0002
0.002 + 0.0020
0.002 + 0.0005
0.005 + 0.0010
[1]
One hour warm-up and a fixed configuration with slow AC filter, sine wave input, and 6½ digits.
Temperature within ±5 °C of temperature at calibration (Tcal between 18-28 °C).
[2]
90 minute warm-up and a fixed configuration and 6½ digits. Temperature within ±1 °C of temperature at calibration (Tcal between
18-28 °C).
[3]
Relative to calibration standards
[4]
20% over range on all ranges except 300VDC and AC ranges and 1 ADC and AC current ranges
[5]
Accuracy for 4-wire ohms or 2-wire ohms with scaling to remove offset; add 4
additional error plus the lead wire resistance to the
2-wire ohms function without scaling. The 34921A and 34922A may have increased relay channel resistance, up to an additional
50
which can occur on modules that have been out of service or following relay inactivity for periods of greater than 1 week. Using
4-wire measurements or switching relays for 2k cycles prior to use typically corrects this problem.
[6]
Add 50
V error for 34923/24/33.
26 34980A Service Guide
Specifications 2
AC Specifications
±
(% of reading + % of range)
Function
True RMS
AC voltage
[5]
Frequency and period
[7]
True RMS AC current
(34921A only)
DMM accuracy ± (% of reading + % of range). Includes measurement error, switching error
[1]
, and transducer conversion error
.
Range
[4]
Frequency 24 hour
[2,3]
Tcal ± 1 ° C
90 days
Tcal ± 5 ° C
1 year
Tcal ± 1 ° C
Temperature coefficient
Tcal ± 5 ° C
100.0000 mV to
100.0000 V
300.0000 V
3Hz-5Hz
5Hz-10Hz
10Hz-20kHz
20kHz-50kHz
50kHz-100kHz
100kHz-300kHz
[6]
3Hz-5Hz
5Hz-10Hz
10Hz-20kHz
20kHz-50kHz
50kHz-100kHz
100kHz-300kHz
[6]
1.00 + 0.03
0.35 + 0.03
0.04 + 0.03
0.10 + 0.05
0.55 + 0.08
4.00 + 0.50
1.00 + 0.05
0.35 + 0.05
4.00 + 1.25
0.04 + 0.05
0.10 + 0.10
0.55 + 0.20
100mV to 300V 3Hz-5Hz
5Hz-10Hz
10Hz-40Hz
40Hz-300kHz
0.10
0.05
0.03
0.006
10.00000 mA and
[5]
1.0 A
100.0000 mA
[8]
3Hz-5Hz
5Hz-10Hz
10Hz-5kHz
3Hz-5Hz
5Hz-10Hz
10Hz-5kHz
1.00 + 0.04
0.30 + 0.04
0.10 + 0.04
1.00 + 0.5
0.30 + 0.5
0.10 + 0.5
1.00 + 0.04
0.35 + 0.04
0.05 + 0.04
0.11 + 0.05
0.60 + 0.08
4.00 + 0.50
1.00 + 0.08
0.35 + 0.08
0.05 + 0.08
0.11 + 0.12
0.60 + 0.20
4.00 + 1.25
0.10
0.05
0.03
0.01
1.00 + 0.04
0.30 + 0.04
0.10 + 0.04
1.00 + 0.5
0.30 + 0.5
0.10 + 0.5
1.00 + 0.04
0.35 + 0.04
0.06 + 0.04
0.12 + 0.05
0.60 + 0.08
4.00 + 0.50
1.00 + 0.08
0.35 + 0.08
0.06 + 0.08
0.12 + 0.12
0.60 + 0.20
4.00 + 1.25
0.10
0.05
0.03
0.01
1.00 + 0.04
0.30 + 0.04
0.10 + 0.04
1.00 + 0.5
0.30 + 0.5
0.10 + 0.5
0.100 + 0.004
0.035 + 0.004
0.005 + 0.004
0.011 + 0.005
0.060 + 0.008
0.20 + 0.02
0.100 + 0.008
0.035 + 0.008
0.005 + 0.008
0.011 + 0.012
0.060 + 0.020
0.20 + 0.05
0.005
0.005
0.001
0.001
0.100 + 0.006
0.035 + 0.006
0.015 + 0.006
0.100 + 0.006
0.035 + 0.006
0.015 + 0.006
[1]
One hour warm-up and a fixed configuration with slow AC filter, sine wave input, and 6½ digits.
Temperature within ±5 °C of temperature at calibration (Tcal between 18-28 °C).
[2]
90 minute warm-up and a fixed configuration and 6½ digits. Temperature within ±1 °C of temperature
at calibration (Tcal between 18-28 °C).
[3]
Relative to calibration standards
[4]
20% over range on all ranges except 300VDC and AC ranges and 1 ADC and AC current ranges
[5]
For sine wave input > 5% of range. For inputs from 1% to 5% of range and < 50 kHz add 0.1% of range
additional error. For AC filter slow.
[6]
Typically 30% of reading error at 1 MHz, limited to 1 x 10
8
volt-hertz
[7]
Input > 100 mV. For 10 mV inputs multiply % of reading error x 10. For 1 second aperture (6½ digits).
[8]
Specified only for inputs > 10 mA. For AC filter slow.
34980A Service Guide 27
2 Specifications
Additional Low Frequency Error for ACV, ACI (% of reading)
Frequency
10 Hz – 20 Hz
20 Hz – 40 Hz
40 Hz – 100 Hz
100 Hz – 200 Hz
200 Hz – 1 kHz
>1 kHz
AC Filter Slow AC Filter Medium AC Filter Fast
0
0
0
0
0
0
0.74
0.22
0.06
0.01
0
0
–
–
0.73
0.22
0.18
0
Additional Error for Frequency, Period (% of reading)
Frequency
3 Hz – 5 Hz
5Hz – 10 Hz
10 Hz – 40 Hz
40 Hz – 100 Hz
100 Hz – 300 Hz
300 Hz – 1 kHz
>1 kHz
1 second
(6 digits)
0
0
0
0
0
0
0
Aperture (Digits)
0.1 seconds
(5 digits)
0.12
0.17
0.2
0.06
0.03
0.01
0
0.01 seconds
(4 digits)
0.12
0.17
0.2
0.21
0.21
0.07
0.02
Temperature
Thermocouple
(34921A only, includes
cold junction accuracy on terminal block)
RTD
Temperature Specifications
Type 1-year accuracy
[1]
S
T
N
R
J
K
B
E
1100 °C to 1820 °C
– 150 °C to 1000 °C
– 150 °C to 1200 °C
– 100 °C to 1200 °C
– 100 °C to 1300 °C
300 °C to 1760 °C
400 °C to 1760 °C
– 100 °C to 400 °C
1.2 °C
1.0 °C
1.0 °C
1.0 °C
1.0 °C
1.2 °C
1.2 °C
1.0 °C
R o
from 49
to
2.1 k
– 200 °C to 600 °C 0.06 °C
24 hour Extended range
[1]
1-year Temp accuracy Coefficient
400 °C to 1100 °C
– 200 °C to – 150 °C
– 210 °C to – 150 °C
– 200 °C to – 100 °C
– 200 °C to – 100 °C
– 50 °C to 300 °C
– 50 °C to 400 °C
1.8 °C
1.5 °C
1.2 °C
1.5 °C
1.5 °C
1.8 °C
1.8 °C
– 200 °C to – 100 °C 1.5 °C
0.03 °C
0.03 °C
0.03 °C
0.03 °C
0.03 °C
0.03 °C
0.03 °C
0.03 °C
0.003 °C
0.08 °C 0.002 °C
[1]
For total measurement accuracy, add temperature probe error.
28 34980A Service Guide
Specifications 2
Typical System Speeds
Measurements made on a 3.2 GHz PC running VB6 in Windows XP Professional.
Single Channel Reading
Time (in msec)
Direct Measurements – direct to I/O
(includes switch, measure time, and I/O time)
Direct
Measurment to
Memory (GPIB)
Single Channel
[1, 2]
GPIB USB 2.0
LAN
(w/VXI 11)
Measurement into memory
Single Channel, DCV
Single Channel, ACV
2.83 ms
5.00 ms
3.14 ms
5.35 ms
4.57 ms
5.75 ms
1.9 ms
4 ms
3.14 ms
10.64 ms
4.65 ms
11.76 ms
1.9 ms
8.4 ms
Single Channel, Ohms
Single Channel while changing scale
(e.g. MEAS DCV 10 to
MEAS DCV 1)
2.91 ms
9.52 ms
Single Channel while changing function
(e.g. MEAS ACV to
MEAS DCV)
Command Execution Time
[3]
34925A
128 ms
Open or Close
Read?
Close/Read/Open
Init/*WAI
Close/Init/Open
34923A
34921A
Open or Close
Read?
Close/Read/Open
Init/*WAI
Close/Init/Open
Open or Close
Read?
Close/Read/Open
Init/*WAI
Close/Init/Open
120 ms
0.7
2.9
4.8
1.9
3.7
0.9
2.9
5.3
1.9
4.2
4.7
2.9
14
1.9
12.4
120 ms
0.9
3.3
5.3
2.1
4.1
1.2
3.3
5.8
2.1
4.7
5
3. 3
15
2.1
14
120 ms
1.8
4.7
6.5
3
5.2
1.6
4.7
6.5
3
4.7
5.3
4.7
15
3
14
[1]
Readings were made with minimum NPLC, delay 0, display off, autozero off.
[2]
All times include the issue of “READ?” and the retrieval of data.
[3]
CLOSE or OPEN bus transfer times allowed to overlap previous command. Command parse times overlap current activity until I/O latency dominant.
34980A Service Guide 29
2 Specifications
Single Channel Measurement Rates — DMM Reading Rates
[1, 2]
Function
DCV
2-wire Resistance
Thermocouple
RTD/Thermistor
ACV
Frequency, period
Resolution
4-1/2 digits (0.02 plc)
5-1/2 digits (1 plc)
6-1/2 digits (10 plc)
4-1/2 digits (0.02 plc)
5-1/2 digits (1 plc)
6-1/2 digits (10 plc)
(0.02 plc)
0.1°C (1 plc)
1°C (0.02 plc)
0.1°C (1 plc)
0.01°C (10 plc)
6-1/2 fast (200 Hz)
6-1/2 Med (20 Hz)
6-1/2 slow (3 Hz)
4-1/2 digits (10 ms)
5-1/2 digits (100 ms)
6-1/2 digits (1 s gate)
[1]
Reading speeds for 60 Hz; autozero OFF
[2]
For fixed function and range, readings to memory, scaling and alarms off, autozero OFF
1900
58
6
350
350
300
70
9
1
Rdgs/s
3000
59
6
2000
58
6
2000
59
Scanning Measurement Rates to Bus or Memory
Scanning Channels
[1]
Direct Measurements – direct to I/O
(includes switch, measure time, and I/O time)
GPIB ch/sec
USB 2.0
ch/sec
LAN (w/VXI 11) ch/sec
Direct
Measurment to
Memory
Into memory ch/sec
Scanning DCV or Ohms
34925A
34923A/24A
34921A/22A
Scanning ACV
[2]
34925A
34923A/24A
34921A/22A
Scanning Temperature
34921A
Scanning Digital in
34950A
920
588
109
318
260
88
109
660
860
572
109
315
260
88
109
592
980
605
109
323
260
88
109
815
[1]
Speeds are for 4½ digits, delay 0, display off, autozero off. Scanning is within bank on the same module.
Add 10 ms for between banks or modules.
[2]
Add additional time for filter setting on ACV.
1000
625
109
318
260
88
109
1038
30 34980A Service Guide
Specifications 2
Data Out of Memory to LAN, USB, or GPIB
Data transfer rate with 1000 channel blocks.
Readings
Readings with Timestamp
Readings with all Format Options
ON
GPIB rdgs/sec
2560
1304
980
[1] LAN large block throughput rate is increased by approximately 30% using LAN sockets.
USB 2.0
rdgs/sec
2400
1230
926
LAN (w/VXI 11)
[1] rdgs/sec
3542
1826
1361
Internal DMM Measurement Characteristics
DC voltage
Measurement method
A-D linearity
Input resistance
100 mV, 1 V, 10 V ranges
100 V, 300 V ranges
Input bias current
Input Protection
True RMS AC voltage
Measurement method
Crest factor
Additional crest factor errors
(non-sinewave)
AC Filter Bandwidth
Slow
Medium
Fast
Input impedance
Input protection
Resistance
Measurement method
Current source
Offset compensation
Maximum lead resistance
Input protection
Continuously integrating multi-slope III A-D converter
0.0002% of reading + 0.0001% of range on 10 V range
Selectable 10 M
or > 10,000 M
10 M
±1%
< 50 pA at 25 °C
300 V all ranges
AC coupled True RMS - measures the AC component of the input with up to 300 VDC of bias on any range
Maximum of 5:1 at full scale
Crest factor 1-2 0.05% of reading
Crest factor 2-3 0.15% of reading
Crest factor 3-4 0.30% of reading
Crest factor 4-5 0.40% of reading
3 Hz – 300 kHz
20 Hz – 300 kHz
200 Hz – 300 kHz
1 M
±2% in parallel with 150 pF
300 Vrms all ranges
Selectable 4-wire or 2-wire ohms
Referenced to LO input
Selectable on 100
, 1 k, and10 k ranges
10% of range per lead for 100
and 1 k ranges.
1 k
on all other ranges
300 V on all ranges
34980A Service Guide 31
2 Specifications
Internal DMM Measurement Characteristics (continued)
Frequency and period
Measurement method
Voltage ranges
Gate time
Measurement time-out
Measurement Consideration
Reciprocal counting technique
Same as AC voltage function
1s, 100 ms, or 10 ms
Selectable 3 Hz, 20 Hz, 200 Hz LF limit
All frequency counters are susceptible to error when measuring low-voltage, low-frequency signals.
Shielding inputs from external noise pickup is critical for minimizing measurement errors.
DC Current
Shunt resistance
Input protection
True RMS AC current
Measurement method
5
for 10 mA, 100 mA; 0.1 for 1 A
1A 250 V fuse on 34921A module
Shunt resistance
Input protection
DC CMRR
AC CMRR
Integration time
200 plc/3.33 s (4 s)
100 plc/1.67 s (2 s)
20 plc/333 ms (400 ms)
10 plc/167 ms (200 ms)
2 plc/33.3 ms (40 ms)
1 plc/16.7 ms (20 ms)
< 1 plc
Direct coupled to the fuse and shunt. AC coupled True
RMS measurement (measures the ac component only).
5
for 10 mA; 0.1 for 100 mA, 1 A
1A 250 V fuse on 34921A module
Thermocouple
Conversion ITS-90 software compensation
Reference junction type
Open thermocouple check
Internal, fixed, or external
Selectable per channel. Open > 5 k
Thermistor
RTD
Measurement noise rejection 60 (50) Hz
[1]
44004, 44007, 44006 series
= 0.00385 (DIN) and = 0.00392
140 dB
70 dB
Normal mode rejection
[2]
105 dB
[3]
100 dB
[3]
95 dB
[3]
90 dB
[3]
85 dB
60 dB
0 dB
[1]
For 1 k
unbalance in LO lead
[2]
For power line frequency ±0.08%
[3]
For power line frequency ±1% use 75 dB or ±2.5% use 60 dB
32 34980A Service Guide
Specifications 2
Internal DMM Measurement Characteristics (continued)
DC Operating Characteristics
[1]
Function
DCV
[4]
, DCI, and Resistance (
10 k
)
Digits
[2]
6½
6½
5½
5½
4½
Auto Zero OFF Operation
Readings
0.6 (0.5)
6 (5)
60 (50)
300
600
Additional RMS Noise Error
0% of range
0% of range
0.001% of range
0.001% of range
[3]
0.01% of range
[3]
Following instrument warm-up at calibration temperature ±1°C and <10 minutes, add 0.0002% range additional error +5 µV. (For 300 VDC, instead of
0.0002% of range, use 0.00066% of range)
Settling Considerations
Reading settling times are affected by source impedance, low dielectric absorption characteristics, and input signal changes.
AC Operating Characteristics
[5]
Function
ACV, ACI
Digits
[6]
6½
6½
5½
6½
6½
Readings/s
7 s/reading
1
8
[7]
10
100
[8]
AC Filter
Slow (3 Hz)
Medium (20 Hz)
Fast (200 Hz)
Fast (200 Hz)
Fast (200 Hz)
[1]
Reading speeds for 60 Hz and (50 Hz) operation; autozero OFF
[2]
6 ½ digits = 22 bits; 5 ½ digits = 18 bits; 4 ½ digits = 15 bits
[3]
Add 20
V for DCV, 4
A for DCI, or 20 m
for resistance.
[4)
For 300 VDC, multiply the additional noise error by 3.3.
[5]
Maximum reading rates for 0.01% of AC step additional error. Additional settling delay required when input DC level varies.
[6]
6 ½ digits = 22 bits; 5 ½ digits = 18 bits; 4 ½ digits = 15 bits
[7]
For external trigger or remote operation using default settling delay (Delay Auto)
[8]
Maximum limit with default settling delays defeated
34980A Service Guide 33
2 Specifications
System Specifications and Characteristics
Scanning inputs
Analog
Digital
Scan triggering
Source
Scan count
Scan interval
Channel delay
External trig delay
External trig jitter
Alarms
Analog inputs
Digital inputs
Monitor channel
Alarm outputs
Latency
Memory
Type
Readings
States
Alarm queue
System features
Per-channel math
min/max/average
Power fail recovery
Relay maintenance
Real-time clock
34921A, 34922A, 34923A, 34924A, and 34925A multiplexer channels
34950A/52A digital in and totalize
Interval, external, button press, software, or on monitor channel alarm
1 to 50,000 or continuous
0 to 99 hours; 1 ms step size
0 to 60 seconds per channel; 1 ms step size
< 2 ms. With monitor on < 200 ms
< 2 ms
Hi, Lo, or Hi + Lo evaluated each scan
34950A/52A digital in maskable pattern match or state change
34950A/52A frequency and totalize: Hi limit only
Alarm evaluated each reading
4 TTL compatible
Selectable TTL logic Hi or Lo on fail
5 ms (typical)
Volatile
500,000 with timestamp, readable during scan
5 instrument states with user label
Up to 20 events with channel number, reading, and timestamp
Individual Mx+B scaling and calculated real time
Save switch states
Counts each relay closure and stores on module,
user resettable
Battery-backed, 20-year typical life
34 34980A Service Guide
Specifications 2
System Specifications and Characteristics (continued)
General specifications
Power supply
Power line frequency
Power consumption
Operating environment
Storage environment
Mainframe dimensions
Mainframe weight
Module dimensions
Safety
EMC
Universal 100 V to 240 V ±10%
50 – 60 Hz ±10% automatically sensed
150 VA
Full accuracy for 0°C to 55°C
Full accuracy to 80% R.H. at 40°C
IEC 60664-1 pollution degree 1
– 40°C to 70°C
[1]
133H x 426W x 341D mm (5.25” x 16.8” x 14”)
Full rack, 3 units high
8.8 kg (19.6 lbs)
280 x 170 x 27 mm (11” x 6.7” x 1”)
Conforms to CSA, UL/IEC/EN 61010-1
Conforms to IEC/EN 61326-1, CISPR 11
Warranty
Software
1 year
Agilent IO Libraries Suite 14.0 or greater (E2094N) connectivity software included
Minimum system requirements (IO libraries and drivers)
PC hardware Intel Pentium 100 MHz, 64 Mbyte RAM,
210 Mbyte disk space
Display 800 x 600, 256 colors, CD-Rom drive
Operating system
[2]
Computer interfaces Standard LAN 10BaseT/100BaseTx
Standard USB 2.0
IEEE 488.2 GPIB
Software driver support for programming languages
Software drivers IVI-C and IVI COM for Windows NT/2000/XP
LabVIEW
Compatible with:
Agilent VEE Pro, Agilent T&M Toolkit (requires Visual Studio.NET)
National Instruments Test Stand, Measurement Studio, LabWindows/CVI, LabVIEW, Switch Executive
Microsoft Visual Studio.NET, C/C++, Visual Basic 6
[1]
Storage at temperatures above 40°C will decrease battery life.
[2]
Load IO Libraries Version M for Windows NT support or version 14.0 for Windows 98 SE support.
34980A Service Guide 35
2 Specifications
Product Dimensions
425.6 mm (16.76 in) 64.6 mm
(2.54 in)
68.2 mm
(2.68 in)
367.7 mm (14.48 in)
36
74.26 mm
(2.92 in)
5.5 mm (0.22 in) SQ
M3.5 x 0.6 Thread
4 Places
404.0 mm (15.90 in)
M4.0 x 0.7 Thread
4 Places
22.4 mm (0.88 in)
2X 88.85 mm
(3.50 in)
128.8 mm
(5.07 in)
2X 93.6 mm (3.68 in)
34980A Service Guide
Specifications 2
To Calculate Total DMM Measurement Error
Each specification includes correction factors which account for errors present due to operational limitations of the optional internal DMM.
This section explains these errors and shows how to apply them to your measurements.
Refer to “Interpreting Internal DMM Specifications" on page 39, to get a
better understanding of the terminology used and to help you interpret the internal DMM’s specifications.
The internal DMM’s accuracy specifications are expressed in the form:
(% of reading + % of range).
In addition to the reading error and range error, you may need to add additional errors for certain operating conditions. Check the list below
to make sure you include all measurement errors for a given function.
Also, make sure you apply the conditions as described in the footnotes
on the specification pages.
• If you are operating the internal DMM outside the 23 °C ± 5 °C temperature range specified, apply an additional temperature
coefficient error.
• For dc voltage, dc current, and resistance measurements, you may need to apply an additional reading speed error.
• For ac voltage and ac current measurements, you may need to apply an additional low frequency error or crest factor error.
Understanding the “% of reading“ Error
The reading error compensates for inaccuracies that result from the function and range you select, as well as the input signal level. The reading error varies according to the input level on the selected range. This error is expressed in percent of reading.
The following table shows the reading error applied to the internal DMM’s
24- hour dc voltage specification.
Range
10 Vdc
10 Vdc
10 Vdc
Input Level
10 Vdc
1 Vdc
0.1 Vdc
Reading Error
(% of reading)
0.0015
0.0015
0.0015
Reading Error
Voltage
150 V
15V
1.5 V
34980A Service Guide 37
2 Specifications
Understanding the “% of range“ Error
The range error compensates for inaccuracies that result from the function and range you select. The range error contributes a constant error, expressed as a percent of range, independent of the input signal level. The following table shows the range error applied to the DMM’s 24- hour dc voltage specification.
Range
10 Vdc
10 Vdc
10 Vdc
Input Level
10 Vdc
1 Vdc
0.1 Vdc
Range Error
(% of range)
0.0004
0.0004
0.0004
Range Error voltage
40 V
40 V
40 V
Total Measurement Error
To compute the total measurement error, add the reading error and range error. You can then convert the total measurement error to a “percent of input” error or a “ppm (part- per- million) of input” error as shown below.
% of input error =
Total Measurement Error
100
Input Signal Level
ppm of input error =
Total Measurement Error
Input Signal Level
1 000 000
Example: Computing Total Measurement Error
Assume that a 5 Vdc signal is input to the DMM on the 10 Vdc range.
To compute the total measurement error using the 90- day accuracy specification of ±(0.0020% of reading + 0.0005% of range).
Reading Error = 0.0020% x 5 Vdc = 100
V
Range error = 0.0005%
10 Vdc = 50
V
Total Error = 100
=
0.0030% of 5 Vdc
=
30 ppm of 5 Vdc
38 34980A Service Guide
Specifications 2
Interpreting Internal DMM Specifications
This section is provided to give you a better understanding of the terminology used and will help you interpret the internal DMM’s specifications.
Number of Digits and Overrange
The “number of digits” specification is the most fundamental, and sometimes, the most confusing characteristic of a instrument. The number of digits is equal to the maximum number of
“9’s” the instrument can measure or display. This indicates the number of full digits. Most instruments have the ability to overrange and add a partial or “½” digit.
For example, the internal DMM can measure 9.99999 Vdc on the 10 V range. This represents six full digits of resolution. The internal DMM can also overrange on the 10 V range and measure up to a maximum of
12.00000 Vdc. This corresponds to a 6½- digit measurement with 20% overrange capability.
Sensitivity
Sensitivity is the minimum level that the instrument can detect for a given measurement. Sensitivity defines the ability of the instrument to respond to small changes in the input level. For example, suppose you are monitoring a 1 mVdc signal and you want to adjust the level to within ±1
V. To be able to respond to an adjustment this small, this measurement would require a instrument with a sensitivity of at least
1
V. You could use a 6½- digit instrument if it has a 1 Vdc or smaller range. You could also use a 4½- digit instrument with a 10 mVdc range.
For ac voltage and ac current measurements, note that the smallest value that can be measured is different from the sensitivity. For the internal
DMM, these functions are specified to measure down to 1% of the selected range. For example, the internal DMM can measure down to 1 mV on the
100 mV range.
Resolution
Resolution is the numeric ratio of the maximum displayed value divided by the minimum displayed value on a selected range.
Resolution is often expressed in percent, parts- per- million (ppm), counts, or bits. For example, a 6½- digit instrument with 20% overrange capability can display a measurement with up to 1,200,000 counts of resolution. This corresponds to about 0.0001% (1 ppm) of full scale, or 21 bits including the sign bit. All four specifications are equivalent.
34980A Service Guide 39
2 Specifications
Accuracy
Accuracy is a measure of the “exactness” to which the internal
DMM’s measurement uncertainty can be determined relative to the calibration reference used. Absolute accuracy includes the Internal DMM’s relative accuracy specification plus the known error of the calibration reference relative to national standards (such as the U.S. National Institute of Standards and Technology). To be meaningful, the accuracy specifications must be accompanied with the conditions under which they are valid. These conditions should include temperature, humidity, and time.
There is no standard convention among instrument manufacturers for the confidence limits at which specifications are set. The table below shows the probability of non- conformance for each specification with the given assumptions.
Specification Criteria Probability of Failure
Mean ± 2 sigma
Mean ± 3 sigma
4.5%
0.3%
Variations in performance from reading to reading, and instrument to instrument, decrease for increasing number of sigma for a given specification. This means that you can achieve greater actual measurement precision for a specific accuracy specification number.
The internal DDMM is designed and tested to meet performance better than mean ±3 sigma of the published accuracy specifications.
24-Hour Accuracy
The 24- hour accuracy specification indicates the internal DMM’s relative accuracy over its full measurement range for short time intervals and within a stable environment. Short- term accuracy is usually specified for a 24- hour period and for a ±1°C temperature range.
90-Day and 1-Year Accuracy
These long- term accuracy specifications are valid for a 23°C ± 5°C temperature range. These specifications include the initial calibration errors plus the internal DMM’s long- term drift errors.
Temperature Coefficients
Accuracy is usually specified for a 23°C ± 5°C temperature range. This is a common temperature range for many operating environments. You must add additional temperature coefficient errors to the accuracy specification if you are operating the instrument outside a 23°C ± 5°C temperature range (the specification is per °C).
40 34980A Service Guide
Specifications 2
Configuring for Highest Accuracy Measurements
The measurement configurations shown below assume that the internal
DMM is in its Factory Reset state. It is also assumed that manual ranging is enabled to ensure proper full scale range selection.
DC Voltage, DC Current, and Resistance Measurements:
• Set the resolution to 6 digits (you can use the 6 digits slow mode for further noise reduction).
• Set the input resistance to greater than 10 G
(for the 100 mV, 1 V, and 10 V ranges) for the best dc voltage accuracy.
• Use 4- wire ohms and enable offset compensation for the best resistance accuracy.
AC Voltage and AC Current Measurements:
Set the resolution to 6 digits.
• Select the slow ac filter (3 Hz to 300 kHz).
Frequency and Period Measurements:
Set the resolution to 6 digits.
34980A Service Guide 41
2 Specifications
42 34980A Service Guide
Agilent 34980A Multifunction Switch/Measure Unit
Service Guide
3
Calibration Procedures
Agilent Technologies Calibration Services 44
Time Required for Calibration 45
Automating Calibration Procedures 45
Aborting a Calibration in Progress 49
Performance Verification Tests 50
Internal DMM Verification Tests 53
Optional AC Performance Verification Tests 59
Plug-in Module Test Considerations 65
34951A 4-Ch Isolated DAC Module 66
34952A Multifunction Module 71
Thermocouple Reference Junction 34921A (Optional) 75
Agilent Technologies
43
3 Calibration Procedures
Calibration Procedures
This manual contains procedures for verification of the instrument’s performance and adjustment (calibration).
Closed-Case Electronic Calibration
The instrument features closed- case electronic calibration. No internal mechanical adjustments are required.
The instrument 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 EEPROM calibration memory does not change when power has been off or after a remote interface reset.
Agilent Technologies Calibration Services
Agilent Technologies offers calibration services at competitive prices.
When your instrument is due for calibration, contact your local Agilent
Service Center for recalibration. See “Types of Service Available" on page 6 for information on contacting Agilent.
Calibration Interval
The instrument should be calibrated on a regular interval determined by the measurement accuracy requirements of your application.
A 1- year interval is adequate for most applications. Accuracy specifications are warranted only if adjustment is made at regular calibration intervals. Accuracy specifications are not warranted beyond the
1- year calibration interval. Agilent does not recommend extending calibration intervals beyond 2 years for any application.
Adjustment is Recommended
Specifications are only guaranteed within the period stated from the last adjustment. Whatever calibration interval you select, Agilent recommends that complete re- adjustment should always be performed at the calibration interval. This will assure that the 34980A will remain within specification for the next calibration interval. This criteria for re- adjustment provides the best long- term stability.
Performance data measured during Performance Verification Tests does not guarantee the instrument will remain within these limits unless the adjustments are performed.
Use the Calibration Count feature (see
) to verify that all adjustments have been performed.
44 34980A Service Guide
Calibration Procedures 3
Time Required for Calibration
The 34980A can be automatically calibrated under computer control.
With computer control you can perform the complete calibration procedure and performance verification tests in less than 30 minutes once the instrument is warmed- up (see
“DMM Test Considerations" on page 53).
Automating Calibration Procedures
You can automate the complete verification and adjustment procedures outlined in this manual. 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 must adjust the instrument using the remote interface. Adjustment cannot be performed from the local front- panel. The instrument must be unsecured prior to initiating the calibration procedure (see
For further information on programming the instrument, see Chapter 2 in the 34980A User's Guide.
For information about errors that may occur during the calibration procedure, see “Calibration Errors" on page 86.
34980A Service Guide 45
3 Calibration Procedures
Recommended Test Equipment
The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, substitute calibration standards of equivalent accuracy.
A suggested alternate method would be to use the Agilent 3458A 8½- digit
Digital Multimeter to measure less accurate yet stable sources. The output value measured from the source can be entered into the instrument as the target calibration value.
Application
Zero Calibration
DC Voltage
DC Current
Resistance
AC Voltage
AC Current
Frequency
Analog Output 34951A
Analog Output 34952A
Thermocouple
Reference Junction
34921A with 34921T Only
Recommended Equipment
None
Fluke 5700A
Fluke 5700A/ 5725A
Fluke 5700A
Fluke 5700A/ 5725A
Fluke 5700A/ 5725A
Agilent 33220A
Internal DMM
Internal DMM
J Type Calibrated
Thermocouple
Triple Point Cell
Relay contact resistance
[1]
All switch modules
Agilent Y1131A
Accuracy Requirements
4 -terminal all copper short
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec
<1/5 instrument 24 hour spec
± 0.1 ×
C
± 0.001
resolution
[1] Optional test if not using relay cycle count.
46 34980A Service Guide
Calibration Procedures 3
Calibration Security
This feature allows you to enter a security code to prevent accidental or unauthorized adjustments of the instrument. When you first receive your instrument, it is secured. Before you can adjust the instrument, you must unsecure it by entering the correct security code.
N O T E
If you forget your security code, you can disable the security feature by following the procedure below.
• The security code is set to AT34980 when the instrument is shipped from the factory. The security code is stored in non- volatile memory, and does not change when power has been off, after a Factory Reset
( *RST command), or after an Instrument Preset ( SYSTem:PRESet command).
• The security code may contain up to 12 alphanumeric characters. The first character must be a letter, but the remaining characters can be letters, numbers, or an underscore ( _ ). You do not have to use all 12 characters but the first character must always be a letter.
• The 34951A 4 Channel DAC has two modes of adjustment, based upon the setting of the calibration security feature. Additional details are
described in “34951A 4- Ch Isolated DAC Module" on page 66.
Use the CALibration:SECure:STATe <mode>,<code> command to secure or unsecure the instrument. Refer to the 34980A Programmer's Reference
Help File for complete information.
To Unsecure the Instrument Without the Security Code
To unsecure the instrument without the correct security code, follow the steps below.
1
2
3
4
5
Turn off the instrument.
Press and hold the DMM (Measure) key and CANCEL key and turn on the unit. You can release the keys when the unit has completed the power on sequence.
Send the CALibration:SECure:STATe OFF,<code> command to the instrument. You may use any valid sequence of characters for the
< code> value.
The unit is now unsecured for calibration.
Enter a new security code when calibration is complete. Be sure to remember the new security code.
34980A Service Guide 47
3 Calibration Procedures
Calibration Message
The instrument allows you to store a message in calibration memory.
You may store a calibration message for the mainframe, the DMM, the
34951A 4- Ch Isolated DAC Module, and 34952A Multifunction Module.
For example, you can store such information as the date when the last calibration was performed, the date when the next calibration is due, the instrument’s serial number, or even the name and phone number of the person to contact for a new calibration.
• You can record a calibration message only from the remote interface and only when the instrument is unsecured. You can read the calibration message whether the instrument is secured or unsecured.
• The calibration message may contain up to 40 characters.
• Remote Interface Commands:
CALibration:STRing <string>,{<slot>|MAINframe|DMM}
CALibration:STRing?
{<slot>|MAINframe|DMM}
Calibration Count
You can query the mainframe, the DMM, the 34951A 4- Ch Isolated DAC
Module, and 34952A Multifunction Module to determine how many calibrations have been performed. Note that your instrument was calibrated before it left the factory. When you receive your instrument,
be sure to read the count to determine its initial value.
• The calibration count increments up to a maximum of 2
32
after which it rolls over to “0”. Since the value increments by one for each calibration point, a complete calibration may increase the value by many counts.
• The calibration count is also incremented with calibrations of the
34951A 4- Ch DAC and DAC channels on the 34952A multifunction module.
• Remote Interface Command:
CALibration:COUNt?
{<slot>|MAINframe|DMM}
48 34980A Service Guide
Calibration Procedures 3
Calibration Process
The following general procedure is the recommended method to complete a full instrument calibration.
1
2
Read
“DMM Test Considerations" on page 53 and
Perform the verification tests to characterize the instrument (incoming data).
3
4
5
Unsecure the instrument for calibration ( “Calibration Security" on page 47).
Perform the DMM adjustment procedures ( “Internal DMM
Perform the DAC adjustment procedures if either the 34951A (
4- Ch Isolated DAC Module" on page 66) or 34952A (
Multifunction Module" on page 71) is installed.
6
7
Secure the instrument against calibration.
Note the new security code and calibration count in the instrument’s maintenance records.
N O T E
The 34951A 4-Ch Isolated DAC is intended to be adjusted frequently to compensate for changes in the module’s environment. These
adjustments can be made either volatile or non-volatile. See page 66 for
details.
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 on any module by turning off the power. You can abort a calibration on the internal DMM or the 34951A 4- Ch Isolated DAC by issuing a remote interface device clear message. You can abort a calibration on the 34952A
Multifunction Module by sending the CALibration:ABORt command.
C A U T I O N
If you abort a calibration in progress when the instrument is attempting to write new calibration constants to EEPROM, you may lose all calibration constants for the function. Typically, upon re-applying power, the instrument will report error 705 Cal:Aborted. You may also generate errors 740 through 746. If this occurs, you should not use the instrument until a complete re-adjustment has been performed. For a list of calibration error numbers, see page 86 .
34980A Service Guide 49
3 Calibration Procedures
Performance Verification Tests
Use the Performance verification Tests to verify the measurement performance of the instrument. The performance verification tests use the instrument’s specifications listed in Chapter 2 Specifications in this manual.
You can perform four different levels of performance verification tests:
• Self- Test A series of internal verification tests that give a high confidence that the instrument is operational.
• Quick Verification A combination of the internal self- tests and selected verification tests.
• Performance Verification Tests An extensive set of tests that are recommended as an acceptance test when you first receive the instrument or after performing adjustments.
• Optional Verification Tests Tests not performed with every calibration.
Perform these tests to verify additional specifications or functions of the instrument.
Self-Test
A brief power- on self- test occurs automatically whenever you turn on the instrument. This limited test assures that the instrument is capable of operation and also checks the plug- in modules for basic operation.
• During the self- test all display segments and annunciators are lit.
• If the self- test fails, the ERROR annunciator turns on. Read any errors using the front panel View menu, or use the SYSTem:ERRor?
command query from the remote interface. If repair is required, contact an
Agilent Service Center.
• If all tests pass, you have a high confidence (
~
90%) that the instrument is operational.
• You can initiate a more complete self test by sending the *TST?
command to the instrument. This command returns a “+0” if all the self- tests pass, or a “+1” if a failure occurred. Depending upon the number and type of modules installed, this command may take up to
2½ minutes to complete. You may need to set an appropriate interface time- out value.
50 34980A Service Guide
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Calibration Procedures 3
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 instrument’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 instrument’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:
• Perform a self- test as described on page 50 .
• Perform only the performance verification tests indicated with the
letter Q.
If the instrument 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 instrument. The acceptance test results should be compared against the 90 day test limits. You should use the 24- hour test limits only for verification within 24 hours after performing the adjustment procedure. After acceptance, you should repeat the performance verification tests at every calibration interval.
If the instrument fails performance verification, adjustment or repair is required.
Adjustment is recommended at every calibration interval. If adjustment is not made, you must guard band, using no more than 80% of the specifications, as the verification limits.
51
3 Calibration Procedures
Internal DMM
Input Connections
Test connections to the internal DMM are best accomplished using the rear panel Analog Bus connector (ABus). You may need to remove the cover for access to this connector. A test fixture can be constructed using a standard DB9 male connector, some shielded twisted pair PTFE insulated cables, and appropriate connectors for the calibrator output
you are using.
You may also use one of the multiplexer modules to connect the calibrator output to the DMM. If you use a multiplexer module, you must take into account any additional relay contacts and resistances in the measurement path. To do this, use the switch/measure model to set up the DMM and switches, not the scan model. For example, send: conf:fres 100;:rout:clos (@1001,1021,1911,1922)
read? (should return something close to zero)
cal:val 0
cal?
In this manual, the direct ABus connection is the one described.
Connections for the ABus connector are shown below.
52
N O T E
Use shielded twisted pair PTFE insulated cables to reduce settling and noise errors. Connect the shield to the source LO output.
PTFE is a registered trademark of E.I. du Pont de Nemours and Company.
34980A Service Guide
Calibration Procedures 3
DMM Test Considerations
Errors may be induced by ac signals present on the input leads during a self- test. Long test leads can also act as an antenna causing pick- up of ac signals.
For optimum performance, all procedures should comply with the following recommendations:
• Assure that the calibration ambient temperature is stable and
between 18 °C and 28 °C. Ideally the calibration should be
performed at 23 °C ±1 °C.
• Assure ambient relative humidity is less than 80%.
• Allow a 1.5- hour warm- up period with a copper short connecting pins
3, 4, 8, and 9 of the ABus connector. Connector pinout is shown in the figure on
.
• Use shielded twisted pair PTFE insulated cables to reduce settling and noise errors. Keep the input cables as short as possible.
• Connect the input cable shield to the source LO output. Except where noted in the procedures, connect the calibrator LO source to earth ground.
• Either remove all modules from the mainframe, or reset the modules to ensure no module is connected to the backplane ABus.
Because the instrument is capable of making highly accurate measurements, you must take special care to ensure that the calibration standards and test procedures used do not introduce additional errors.
Ideally, the standards used to verify and adjust the instrument should be an order of magnitude more accurate than each instrument range full scale error specification.
For the dc voltage, dc current, and resistance gain verification measurements, you should take care to ensure the calibrator’s “0” output is correct. If necessary, the measurements can be referenced to the calibrator’s “0” output using Mx + B scaling (see Chapter 2 in the 34980A
User's Guide). You will need to set the offset for each range of the measuring function being verified.
34980A Service Guide 53
3 Calibration Procedures
Internal DMM Verification Tests
Zero Offset Verification
This procedure is used to check the zero offset performance of the internal DMM. Verification checks are only performed for those functions and ranges with unique offset calibration constants. Measurements are checked for each function and range as described in the procedure on the next page.
54 34980A Service Guide
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Calibration Procedures 3
Zero Offset Verification Procedure
1
2
3
Make sure you have read “DMM Test Considerations" on page 53.
Short all the inputs on the input test connector (see
Leave the Current input open. Connect the shorts as close to the input connector as possible.
Select each function and range in the order shown in the table below.
Make a measurement and return the result. Compare measurement results to the appropriate test limits shown in the table.
Input Function
Open
[1]
Range
DC Current 10 mA
Open
Open
Short
Short
Short
Short
Short
Short
Short
Short
Short
Short
Short
DC Volts
2-Wire Ohms
[2] and 4-Wire
Ohms
100 mA
1 A
100 mV
1 V
100 V
300 V
100
1 k
10 k
100 k
1 M
10 M
100 M
Check
Q
Q
24 hour
± 1 µA
± 4 µA
± 60 µA
± 3.5 µV
± 6 µV
± 600 µV
± 6 mV
± 3.5 m
± 6 m
± 50 m
± 500 m
± 10
± 100
± 10 k
90 day
± 2 µA
± 5 µA
± 100 µA
± 4 µV
± 7 µV
± 50 µV
± 600 µV
± 9 mV
± 4 m
± 10 m
± 100 m
± 1
± 10
± 100
± 10 k
[1] Select 6½ digit resolution.
[2] For 2-wire ohms using a multiplexer for the input connections, an additional 4
of error for the relay contacts must be added.
Q: Quick performance verification test points.
1 year
± 2 µA
± 5 µA
± 100 µA
± 4 µV
± 7 µV
± 50 µV
± 600 µV
± 9 mV
± 4 m
± 10 m
± 100 m
± 1
± 10
± 100
± 10 k
N O T E
Zero offset calibration using a multifunction calibrator is NOT recommended. The calibrator and cabling offset can be large and unstable causing poor offset calibration of the internal DMM.
55
3 Calibration Procedures
56
Gain Verification
This procedure is used to check the “full scale” reading accuracy of the internal DMM. Verification checks are performed only for those functions and ranges with unique gain calibration constants.
DC VOLTS, Resistance, and DC CURRENT Gain Verification Test
1
2
3
Make sure you have read “DMM Test Considerations" on page 53.
Select each function and range in the order shown below. Provide the input shown in the table below.
Make a measurement and return the result. Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling when using the Fluke 5700A.)
Input Quick
Function
[1]
Range
Check
24 hour
Error from Nominal
90 day 1 year
100 mV DC Volts 100 mV ± 6.5 µV ± 8 µV ± 9 µV
1 V
10 V
1 V
10 V
100 V
300 V
100
1 k
10 k
100 k
1 M
10 M
100 M
10 mA
100 mA
DC Current
100 V
2-Wire Ohms
[2] and 4-Wire
Ohms
300 V
100
1 k
10 k
100 k
1 M
10 M
100 M
10 mA
100 mA
1 A 1 A
Q
Q
Q
Q
Q
± 26 µV
± 190 µV
± 2.6 mV
± 12 mV
± 6.5 m
± 26 m
± 250 m
± 2.5
± 30
± 1.6 k
± 310 k
± 1.5 µA
± 14 µA
± 560 µA
± 37 µV
± 250 µV
± 4.1 mV
± 19.5 mV
± 12 m
± 90 m
± 900 m
± 9
± 90
± 2.1 k
± 810 k
± 5 µA
± 35 µA
± 900 µA
± 47 µV
± 400 µV
± 5.1 mV
± 22.5 mV
± 14 m
± 110 m
± 1.1
± 11
± 110
± 4.1 k
± 810 k
± 7 µA
± 55 µA
± 1.1 mA
[1] Select 6 ½ digit resolution.
of error for the relay contacts must be added. Add a 1-second channel delay when using Fluke 5700 in 2-wire compensated mode. This avoids response time issues with 2-wire compensation when 34980A’s current source contains a pulse.
[3] Verify only, no adjustment required.
Q: Quick performance verification test points.
34980A Service Guide
34980A Service Guide
Calibration Procedures 3
AC VOLTS Gain Verification Test
Configuration: AC Volts
CONFigure[:VOLTage]:AC
LF 3 HZ:SLOW
[SENSe:]VOLTage:AC:BANDwidth 3
1
2
3
Make sure you have read “DMM Test Considerations" on page 53.
Set the AC VOLTS function and the 3 Hz input filter. With the slow filter selected, each measurement takes 7 seconds to complete.
Select each range in the order shown below. Provide the indicated input voltage and frequency. Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling.)
Vrms
100 mV
100 mV
1 V
1 V
10 V
10 V
10 V
10 mV
[1]
100 V
100 V
300 V
300 V
[2]
Frequency
1 kHz
50 kHz
1 kHz
50 kHz
1 kHz
50 kHz
10 Hz
1 kHz
1 kHz
50 kHz
1 kHz
50 kHz
Range
100 mV
1
10 V
100 mV
100 V
300 V
Check
24 hour
± 70 µV
Q
90 day
± 90 µV
1 year
± 100 µV
± 150 µV ± 160 µV ± 170 µV
± 700 µV ± 900 µV ± 1 mV
± 1.5 mV ± 1.6 mV ± 1.7 mV
± 7 mV ± 9 mV ± 10 mV
Q
Q
± 15 mV ± 16 mV ± 17 mV
± 7 mV ± 9 mV ± 10 mV
± 34 µV ± 45 µV ± 46 µV
± 70 mV ± 90 mV ± 100 mV
± 150 mV ± 160 mV ± 170 mV
± 270 mV ± 390 mV ± 420 mV
± 600 mV ± 690 mV ± 720 mV
[1] For this test, isolate the calibrator’s output from earth ground to prevent ground noise affecting the reading.
[2] Some calibrators may have difficulty driving the internal DMM and cable load at this V-Hz output. Use short, low capacitance cable to reduce calibration loading. Verification can be performed at >195 Vrms.
New test limits can be computed from the accuracy specification shown in the data sheet for the actual test conditions used.
Q: Quick performance verification test points.
57
3 Calibration Procedures
N O T E
The 50 kHz ac voltage test points may fail performance verification if
the DMM internal shields have been removed and reinstalled. See “Gain
Adjustment" on page 61 for further information on how to recalibrate
the ac voltage function.
AC CURRENT Gain Verification Test
Configuration: AC Current
CONFigure:CURRent:AC
LF 3 HZ:SLOW
[SENSe:]CURRent:AC:BANDwidth 3
1
2
3
Make sure you have read “DMM Test Considerations" on page 53.
Set the AC CURRENT function and the 3 Hz input filter. With the slow filter selected, each measurement takes 7 seconds to complete.
Select each range in the order shown below. Provide the input current and frequency indicated. Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling.)
Current
10 mA
[1]
100 mA
[1]
10 mA
1A
[1]
Frequency
1 kHz
1 kHz
1 kHz
1 kHz
Range
10 mA
100 mA
1 A
1 A
[1] Verify only, no adjustment.
Q: Quick performance verification test points.
Check
24 hour
± 14 µA
Q
90 day
± 14 µA
1 year
± 14 µA
± 600 µA ± 600 µA ± 600 µA
± 1.41 mA ± 1.41 mA ± 1.41 mA
± 1.4 mA ± 1.4 mA ± 1.4 mA
58 34980A Service Guide
34980A Service Guide
Calibration Procedures 3
Frequency Gain Verification Test
Configuration: Frequency
6½ digits
[SENSe:]FREQuency:APERture 1
1
2
3
Make sure you have read “DMM Test Considerations" on page 53.
Select the FREQUENCY function and set 6½ digits.
Select each range in the order shown below. Provide the input voltage and frequency indicated. Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling.)
Voltage
10 mV
[1]
1 V
Frequency
100 Hz
100 kHz
Range
100 mV
1 V
Check
Q
24 hour 90 day
± 0.06 Hz ± 0.1 Hz
± 6 Hz ± 10 Hz
1 year
± 0.1 Hz
± 10 Hz
[1] Verify only, No adjustment. For this test, isolate the calibrator’s output from earth ground.
Q: Quick performance verification test points.
59
3 Calibration Procedures
Optional AC 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.
There are no adjustments for these tests; they are provided for performance verification only.
Configuration: AC Volts
CONFigure[:VOLTage]:AC
LF 3 HZ:SLOW
[SENSe:]VOLTage:AC:BANDwidth 3
1
2
3
Make sure you have read “DMM Test Considerations" on page 53.
Select the AC Volts function and the 3 Hz filter.
Select each range in the order shown below. Provide the input voltage and frequency indicated. Compare measurement results to the appropriate test limits shown in the table below. (Be certain to allow for appropriate source settling.)
Voltage Frequenc y
1 V
1 V
1 V
20 Hz
20 kHz
Range
1 V
1 V
100 kHz 1 V
1 V
10 V
1 V
100 mV
300 kHz 1 V
1 kHz
1 kHz
1 kHz
10 V
10 V
10 V
24 hour 90 day 1 year
± 700 µV ± 900 µV ± 1 mV
± 700 µV ± 900 µV ± 1 mV
± 6.3 mV ± 6.8 mV ± 6.8 mV
± 45 mV ± 45 mV ± 45 mV
± 7 mV ± 9 mV ± 10 mV
± 3.4 mV ± 4.5 mV ± 4.6 mV
± 13 mV ± 14 mV ± 14 mV
60 34980A Service Guide
Calibration Procedures 3
Internal DMM Adjustments
You will need a test input fixture to adjust the internal DMM
(see
Zero Adjustment
Each time you perform a zero adjustment, the Internal DMM stores a new set of offset correction constants for every measurement function and range. The Internal DMM will sequence through all required functions and ranges automatically and store new zero offset calibration constants. All offset corrections are determined automatically. You may not correct a single range or function without re- entering ALL zero offset correction constants automatically. This feature is intended to save calibration time and improve zero calibration consistency.
N O T E
Never turn off the Internal DMM during Zero Adjustment. This may cause ALL calibration memory to be lost.
Zero Adjustment Procedure
The zero adjustment procedure takes about 5 minutes to complete. Be sure to allow the instrument to warm up for 2 hours before performing the adjustments.
1 This procedure will use the copper shorts installed on input test connector. Leave the Current input connection open.
2
3
4
5
Set the DC VOLTS function.
Send the value 0.000000 to the instrument using the
CALibration:VALue 0.000000
command.
Calibrate the instrument using the CALibration?
command.
Perform the “Zero Offset Verification" on page 53 to check zero
calibration results.
34980A Service Guide 61
3 Calibration Procedures
Gain Adjustment
The Internal DMM stores a single new gain correction constant each time this procedure is followed. The gain constant is computed from the calibration value entered for the calibration command and from measurements made automatically during the adjustment procedure.
Most measuring functions and ranges have gain adjustment procedures.
Only the 100 M
range does not have gain calibration procedures.
Adjustments for each function should be performed ONLY in the order shown in the performance verification table. See
Tests" on page 50 for the tables used for gain adjustments.
Gain Adjustment Considerations
• The zero adjustment procedure must have been recently performed prior to beginning any gain adjustment procedures.
• The optional –10 Vdc adjustment should be performed only after servicing the Internal DMM’s a- to- d converter.
• When performing a 4- wire ohms gain adjustment, a new gain correction constant is also stored for the corresponding 2- wire ohms measurement range. If desired, the 2- wire gain can be adjusted separately after the
4- wire ohms gain calibration is completed. If the 2- wire Ohms gain is adjusted separately, the 2- wire Ohms function will not meet specifications when offset compensated Ohms is used.
• During the ac voltage gain adjustments, some of the dc voltage gain constants are used. Perform the dc voltage gain calibration before the ac voltage gain calibration.
N O T E
Never turn off the instrument during a Gain Adjustment. This may cause calibration memory for the present function to be lost.
62 34980A Service Guide
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Calibration Procedures 3
Valid Gain Adjustment Input Values
Gain adjustment can be accomplished using the following input values.
DC VOLTS
OHMS, OHMS 4W
DC CURRENT
AC VOLTS [1]
AC CURRENT
FREQUENCY
100 mV to 100 V
300 V
100
to 10 M
10 mA to 1 A
10 mV to 100 V
300 V
1 A
Any
[1] Valid frequencies are as follows: 1 kHz ± 10% for the 1 kHz calibration,
45 kHz–100 kHz for the 50 kHz calibration,
and 10 Hz ± 10% for the 10 Hz calibration.
Input Values
0.9 to 1.1 x Full Scale
250 V to 303 V
0.9 to 1.1 x Full Scale
0.9 to 1.1 x Full Scale
0.9 to 1.1 x Full Scale
95 V to 303 V
9 mA to 11 mA
Any Input > 100 mV rms, 1 kHz – 100 kHz
63
.
3 Calibration Procedures
Gain Adjustment Procedure
Adjustment for each function should be performed only in the order shown in the performance verification table. The performance verification
tables used for gain adjustments start on page 55 .
Review the
“DMM Test Considerations" on page 53 and
Considerations" on page 61 sections before beginning this test.
Configuration: DC functions — 6½ digits
AC functions — LF 3 HZ:SLOW
1
2
Configure each function and range shown in the gain verification tables
).
Apply the input signal shown in the “Input” column of the appropriate verification table.
N O T E
Always complete tests in the same order as shown in the appropriate verification table.
4
5
3
6
Send the actual input value to the instrument using the
CALibration:VALue <value> command.
Calibrate the instrument using the CALibration?
command.
Perform the appropriate Gain Verification Test to check the calibration results.
Repeat steps 1 through 5 for each gain verification test point shown in the tables.
N O T E
Each range in the gain adjustment procedure takes less than 20 seconds to complete.
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Calibration Procedures 3
–10 Vdc Adjustment Procedure (Optional)
The –10 Vdc calibration electronically enhances the Internal DMM’s a- to- d converter linearity characteristic. This adjustment should ONLY be performed after servicing the A- to- D converter or replacement of the calibration RAM.
You will need an input test connector as described in “Input
1 If a zero calibration has not been performed recently, perform one
before beginning this procedure (see page 60 ).
2 Configure the instrument as follows:
DC VOLTS
10 V range
[SENSe:]VOLTage[:DC]:RANGe 10
6½ digits
INTEG 100 PLC [SENSe:]VOLTage[:DC]:NPLC 100
INPUT R > 10 G [SENSe:]VOLTage[:DC]:IMP:AUTO ON
3
4
5
6
Measure and note the voltage offset present at the end of the measurement cable by shorting the ends of the cable. Be sure to use a copper wire and allow enough time for the residual thermal offset to stabilize (usually about 1 minute).
Connect the input cable to the calibrator output and set the calibrator to output +10V. Allow enough settling time for any thermal offset voltages to stabilize (usually about 1 minute).
Perform a +10V dc gain calibration.
Send an adjustment to the instrument. The adjustment value is the sum of the calibrator output and the measured offset (from step 3). For example, if the calibrator output is 10.001 volts and the measured offset is 10 µV, send the value +10.001010 volts. When the adjustment finishes, verify that new readings fall within ±20 µV of the calibrator output plus the offset.
7
8
Reverse the cable connections to the calibrator to create a –10 Vdc voltage standard. You must physically reverse the cables. DO NOT switch the output polarity of the calibrator.
Perform a –10V DC gain calibration. Be sure to allow time for thermal offsets to stabilize (usually about 1 minute).
9 Send an adjustment to the instrument. The adjustment value is the sum of the calibrator output and the measured offset (from step 3). Using the previous example values, enter 10 µV minus 10.001 volts or
–10.000990 volts.
10 When the adjustment finishes, verify that new readings fall
within ± 30 µV of the calibrator output minus the offset.
65
3 Calibration Procedures
Plug-in Modules
Plug-in Module Test Considerations
For optimum performance, all test procedures should comply with the following recommendations:
• Assure that the calibration ambient temperature is stable and
between 18 °C and 28 °C. Ideally the calibration should be
performed at 23 °C ± 1 °C.
• Assure ambient relative humidity is less than 80%.
• Install the plug- in module and allow a 1 hour warm- up period before verification or adjustment.
• Use shielded twisted pair PTFE insulated cables to reduce settling and noise errors. Keep the input cables as short as possible.
• Remove all user wiring and connections from the plug- in modules before verification or adjustment.
• Use 4- wire Ohms measurement techniques for checking relay contact resistance. Check directly at the terminals where possible.
66 34980A Service Guide
Calibration Procedures 3
34951A 4-Ch Isolated DAC Module
Each isolated DAC output channel can be measured and adjusted using the internal DMM. The Internal DMM is recommended because it compensates for ambient temperature.
The 34951A features “auto- calibration”. Upon receipt of the calibration command, all channels on the DAC are adjusted using the internal DMM.
Additionally you may adjust ALL 34951A modules installed in the instrument with one command. The adjustments require approximately
one minute per module.
N O T E
The 34951A 4-Ch Isolated DAC is intended to be adjusted frequently to compensate for changes in the module’s environment (changes in ambient temperature, changing the mainframe slot used, adding or removing modules to a system). These adjustments can be made either volatile or non-volatile as described below. The adjustment procedure is
There are two ways to adjust the DACs, depending upon the state of
calibration security (see “Calibration Security" on page 47).
• If the instrument is secured for calibration when the adjustment is begun, the adjustments are considered volatile. All adjustments are discarded when power is cycled. This provides an easy means to make immediate temperature- compensated adjustments to the DAC outputs without overwriting stored calibration constants.
When this type of adjustment is made, the calibration count
(see
) is not advanced.
• If the instrument is unsecured for calibration, the adjustments are written to non- volatile calibration memory. The calibration count
(see
) is advanced.
34980A Service Guide 67
3 Calibration Procedures
34951A Verification
Test Connections
The DAC outputs can be measured using an external voltmeter, or using a test fixture such as the one shown below, with the internal DMM via the ABus connector on the instrument’s rear panel.
68 34980A Service Guide
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Calibration Procedures 3
Analog Output Verification Test
This procedure is used to check the calibration of the analog outputs on the 34951A 4- channel DAC Module.
Verification checks are performed only for those output values with unique calibration constants.
1
2
3
Using the input test connector described on page 67 , leave the current input terminal open. Set the DMM to the 100 mA range. Make and record a current measurement. This value will be used as an offset value during the output current zero verification.
Make voltage measurement connections to channel 1 of the module.
Set each output voltage value in the table below and make a measurement. Compare measurement results to the appropriate test limits shown in the table.
N O T E
It is not necessary to test the voltage output at the full rated 10 mA load.
If you test the output using a load, connect the sense terminals.
6
7
4
5
Make current measurement connections to channel 1 of the module. Set the DMM to the 100 mA range.
Set each output current value in the table below and make a measurement. Compare measurement results to the appropriate test limits shown in the table. When measuring the 0 mA output value, apply the offset value from step 1 to the measured value.
Repeat steps 2 through 5 for channels 2, 3 and 4.
Remove the input test connector.
69
3 Calibration Procedures
.
Output Voltage
16 V
12 V
10 V
8 V
4 V
0 V
-4V
-8 V
-10 V
-12 V
-16 V
Output Current
20 mA
15 mA
10 mA
5 mA
0 mA
[1]
-5 mA
-10 mA
-15 mA
-20 mA
Quick
Check
Q
Q
Q
Quick
Check
Q
Q
Q
Error from
Nominal (90 day)
± 11 mV
± 9 mV
± 8 mV
± 7 mV
± 5 mV
± 3 mV
± 5 mV
± 7 mV
± 8 mV
± 9 mV
± 11 mV
Error from
Nominal (90 day)
± 23
A
± 18.5
A
± 14
A
± 9.5
A
± 5
A
± 9.5
A
± 14
± 23
A
± 18.5
A
A
[1] Apply a measured “0” offset to this measurement.
70 34980A Service Guide
Calibration Procedures 3
Analog Output Adjustment
Install the 34951A module in the mainframe and allow a 1 hour warm- up before performing these procedures.
This adjustment procedure sets a zero adjustment and a gain adjustment constant for each DAC output. You must perform all the adjustments on one analog output channel before adjusting the other analog output channel.
1 Install the module(s) in the instrument. Remove any inputs from the
ABus connector.
C A U T I O N
Remove any ABus connector before performing this procedure.
2
3
4
Set the calibration security for the adjustment mode you desire, see
Send the CALibration:MODule? <slot> command to begin the auto- calibration procedure for all channels on the module in <slot> .
You may use the CALibration:MODule? ALL command to perform the auto- calibration on all channels for all modules installed in the mainframe. The complete procedure may take up to 1 minute per module. Be sure to set the remote command time- out value appropriately.
The command returns a value of “+0” if the calibration is successful.
A returned value of “+1” indicates a calibration failure.
N O T E
Following the auto-calibration procedure, the DMM is left in its reset state (DCV).
34980A Service Guide 71
3 Calibration Procedures
34952A Multifunction Module
The only calibration constants are for the two DAC outputs on the 34952A
Multifunction Module. These outputs can be measured using an external voltmeter, or with a test fixture such as the one shown below, using the internal DMM via the ABus connector on the instrument’s rear panel.
72
34952A Verification
Analog Output Verification Test
This procedure is used to check the calibration of the analog outputs on the 34952A Multifunction Module.
Verification checks are performed only for those output values with unique calibration constants.
1
2
Use the internal DMM to measure the output of each channel. You will need to physically move the input connections on the 34952A module to channel 6 and then channel 7.
For each analog output (channel 6 and channel 7), set each output value in the table on the next page. Compare measurement results to the appropriate test limits shown in the table.
N O T E
It is not necessary to test the voltage output at the full rated 10 mA load.
34980A Service Guide
34980A Service Guide
Calibration Procedures 3
Output Voltage Quick Check Error
Nominal (1 year)
10 V Q ± 45 mV
0 V
-10 V
Q ± 20 mV
± 45 mV
Analog Output Adjustment
Install the 34952A module in the mainframe and allow a
1 hour warm- up before performing these procedures.
This adjustment procedure sets a zero adjustment and a gain adjustment constant for each DAC output. You must perform all the adjustments on one analog output channel before adjusting the other analog output channel.
1
2
3
4
Install the module(s) in the instrument.
Unsecure the instrument for calibration (see page 47
).
Connect channel 6 DAC output to the DMM input. Set the DMM to measure DC volts.
The calibration procedure makes two adjustments per channel.
After sending the first command, measure the module output. Send the measured value to the module and advance to the next point.
This procedure is summarized as follows: a Send the following command to begin the procedure.
CALibration:BEGin:VOLTage 1,(@<channel> ) b c d
Measure the module output.
Send the measured value to the module with the following command:
CALibration:POINt? <value>
The command returns a “+1” to indicate it is ready for the next point.
5 f e Measure the module output.
Send the measured value to the module with the following command:
CALibration:POINt? <value> g The command returns a “+0” to indicate the calibration on the channel is completed.
Repeat steps 3 and 4 for channel 7.
73
3 Calibration Procedures
Relay Plug-in Modules
There are two methods you can use to verify relays:
• Read the relay cycle count.
• Measure the relay contact resistance.
Relay Cycle Count
The instrument has a Relay Maintenance System to help you predict relay end- of- life. The instrument counts the cycles on each relay in the instrument and stores the total count in non- volatile memory on each switch module. You can use this feature on any of the relay modules and the internal DMM.
• In addition to the channel relays, you can also query the count on backplane relays and bank relays. Note that you cannot control the state of these relays from the front panel but you can query the count.
• You can also query the state of the six relays on the internal DMM.
These relays open or close when a function or range is changed on a module.
• You can reset the count but the instrument must be unsecured (see
“Calibration Security" on page 47 to unsecure the instrument).
• The 34923A, 34924A, and 34933A modules can be configured for 2- wire
(differential) or 1- wire (single ended) measurements. Since two coils are required to drive each channel relay in the 2- wire mode, the module stores the cycle count for each coil and returns the greater of the two.
To determine the cycle count for each coil, reconfigure the module for the 1- wire mode (a power cycle is required) and query the count.
• The FET switches on the 34925A FET Multiplexer module have an infinite life when used under normal operating conditions. Therefore, the cycle count is not recorded and this command always returns “0”
(will not generate an error). Although the count on the FET switches is not recorded, you can read the actual cycle count on the mechanical
Analog Bus relays.
• On the RF Multiplexer modules (34941A, 34942A), the signal path to the COM terminal consists of both a channel relay and a bank relay.
For each bank, the module stores the cycle count for each channel relay, the bank relay, and returns the greater of the two. For example, to determine the cycle count on Channel 11, the module recalls the count on Channel 11, the count on the Bank 1 relay, and returns the greater of the two. In addition, the cycle count on the two channels within the same physical relay package, will always be equal. Therefore, the cycle count for Channels 11 and 12 will always be equal.
74 34980A Service Guide
34980A Service Guide
Calibration Procedures 3
Use the DIAGnostic:RELay:CYCLes? (@<ch_list>)
command to read relay cycle counts on the following modules:
• 34921A through 34925A Multiplexer Modules
• 34931A through 34933A Matrix Modules
• 34937A and 34938A GP Switch Modules
• 34941A and 34942A RF Multiplexer Modules
• 34946A and 34947A Microwave Switch Modules
Use the DIAGnostic:DMM:CYCLes? {1|2|3|4|5|6}
command to read relay cycle counts for the internal DMM function and range relays.
By maintaining a count you can estimate which relays are nearing the end of their useful life.
Relay Contact Resistance Verification (Optional)
The Agilent Y1131A Verification/Diagnostic Software Kit contains software and hardware used to test the relay switching modules available for the
Agilent 34980A Multifunction Switch/Measure Unit. The software provides module–specific tests to assist you with troubleshooting possible relay failures and predicting system maintenance requirements. Custom terminal blocks are provided to route signals and isolate individual relays for verification and diagnostics.
For several of the relay switching modules, it is very difficult to isolate a particular channel. The Y1131A Verification/Diagnostic Software used in conjunction with the provided verification terminal blocks attempts to isolate measurement channels in a repeatable manner.
75
3 Calibration Procedures
Thermocouple Reference Junction 34921A (Optional)
N O T E
You should perform these verification if you are using the module for thermocouple measurements.
To make a thermocouple measurement a known reference junction temperature measurement must be made. The reference junction temperature is measured by two solid state temperature sensors in the input connection area on the module. The adjustments store calibration constants used to correct the measurements from the temperature sensors.
Thermocouple measurements using an internal reference are only supported by the 34921A module using the optional 34921T terminal block. The isothermal block is located on, and is an integral part of,
the terminal block.
There are no adjustments for the reference junction.
Thermocouple Reference Junction Verification
3
4
1
2
5
6
Read
“Plug- in Module Test Considerations" on page 65.
Connect a calibrated thermocouple to channel 21.
Install the module in slot 1.
Place the J Type calibrated thermocouple at a known temperature
(ice bath or calibrator).
Select Channel 21. Configure the channel as follows:
TEMPERATURE
THERMOCOUPLE
J TYPE
INTEG 10 PLC
INTERNAL REF
SENS:TEMP:TRAN:TYPE TC,(@1021)
SENS:TEMP:TRAN:TC:TYPE J,(@1021)
SENS:TEMP:NPLC 10,(@1021)
SENS:TEMP:TRANS:TC:RJUN:TYPE INT,(@1021)
Subtract the thermocouple error from the measured temperature.
Verify the result is within ± 1.0 °C of the known temperature (set in step 4).
76 34980A Service Guide
Agilent 34980A Multifunction Switch/Measure Unit
Service Guide
4
Troubleshooting and Diagnostics
Isolate a Problem with a Plug-In Module 90
34921A 40-Channel Armature Multiplexer with Low Thermal Offset 92
34922A 70-Channel Armature Multiplexer 94
34923A 40/80-Channel Reed Multiplexer 96
34924A 70-Channel Reed Multiplexer 98
34925A 40/80-Channel Optically-Isolated FET Multiplexer 100
34931A Dual 4x8 Armature Matrix 102
34932A Dual 4x16 Armature Matrix 104
34933A Dual/Quad 4x8 Reed Matrix 107
34937A 32-Channel GP Switch 111
34938A 20-Channel High-Current GP Switch 112
Agilent Technologies
77
4 Troubleshooting and Diagnostics
Troubleshooting and Diagnostics
This chapter provides basic instructions to isolate a problem.
Troubleshooting Hints
This section provides a brief checklist of common failures. Before troubleshooting the instrument, be sure the failure is in the instrument rather than any external connections.
Unit seems inoperative
1
2
3
4
5
Verify the ac power cord is connected to the instrument.
Press the front panel power switch.
Listen for the fan (on the right side of the instrument) to isolate a problem with the front panel.
Remove all plug- in modules to verify a module is not causing the failure.
Verify the power supply as described on page 79
.
Isolating to an assembly
1
2
3
4
Remove all plug- in modules from the mainframe.
Remove any connections to the Analog Bus.
Turn on power and listen for the beep and fan operation. The fan operates from the main power supply.
Isolate the internal DMM by removing it from the instrument. The instrument should turn on and pass self- test without the internal DMM installed. Disassembly procedures begin on
.
Unit fails self-test
1
2
3
4
Check the display for the power on self test results.
Remove all plug- in modules from the mainframe and any connections to the Analog Bus. Run the self- test again. A passing self- test indicates a problem with a plug- in module. Replace the plug- in modules one at a time to isolate the failing module.
If the self test still fails, remove the internal DMM from the instrument.
The instrument should turn on and pass self- test without the internal
DMM installed. Disassembly procedures begin on page 115 .
Self- test errors are described beginning on page 82
.
78 34980A Service Guide
Troubleshooting and Diagnostics 4
Power Supply
The main power supply provides +12 Volts. All other power supplies are derived from this supply. To test the main power supply:
WA R N I N G
Exposed Mains. When the instrument cover is removed to test the power supply, the ac mains are exposed.
1
2
3
Disassemble the instrument as described beginning on page 115 .
Use a DVM to check that the power supply output is +12 V ± 0.6 V.
Test the power supply output at the red leads on the power supply connector to the communications board. a The +12 Volt supply is always on when the ac power is applied to the instrument. Test for loading errors by unplugging the power supply connector from the communications board.
Use an oscilloscope to verify there is no ac oscillation on the +12 V power supply.
Replace the power supply assembly if +12 V is not present.
Product Firmware Updates
As new product features and enhancements become available, you can easily update your mainframe and plug- in module firmware to ensure optimum compatibility. The latest firmware updates are available from the
Agilent 34980A product page at www.agilent.com/find/34980AUpdates .
Front Panel Operation:
Utility > FIRMWARE > UPDATE
Once you have downloaded the latest mainframe firmware (see above),
use the knob to scroll through the installed modules that require a firmware update. To exit the menu without installing the updates,
select CANCEL.
34980A Service Guide 79
4 Troubleshooting and Diagnostics
Instrument Errors
A record of up to 20 errors can be stored in the instrument's error queue.
Each remote interface I/O session (i.e., GPIB, USB, LAN, etc.) has its own interface- specific error queue. Errors appear in the error queue of the I/O session that caused the error. For example, if an error was generated by a command sent over the GPIB interface, send this command from GPIB to read the error queue.
The instrument beeps once each time a command syntax or hardware error is generated. The front- panel ERROR annunciator turns on when one or more errors are currently stored in the error queue.
A special global error queue holds all power- on and hardware- related errors (e.g., over- temperature, Safety Interlock, etc.).
Errors are retrieved in first- in- first- out (FIFO) order. The first error returned is the first error that was stored. Once you have read all of the interface- specific errors, the errors in the global error queue are retrieved.
Errors are cleared as you read them. When you have read all errors from the interface- specific and global error queues, the ERROR annunciator turns off and the errors are cleared.
If more than 20 errors have occurred, the last error stored in the queue
(the most recent error) is replaced with - 350,"Error queue overflow".
No additional errors are stored until you remove errors from the queue.
If no errors have occurred when you read the error queue, the instrument responds with +0,"No error".
The front panel reports errors from all I/O sessions as well as the global error queue. To read the error queue from the front panel, use the View key.
Error conditions are also summarized in the Status Byte Register.
For more information on the SCPI Status System for the Agilent 34980A, see Status System Introduction.
The interface- specific and global error queues are cleared by the *CLS
(Clear Status) command and when power is cycled. The errors are also cleared when you read the error queue. The error queue is not cleared by a Factory Reset ( *RST command) or an Instrument Preset ( SYSTem:PRESet command).
80 34980A Service Guide
Troubleshooting and Diagnostics 4
Front-Panel Operation
If the ERROR annunciator is on, press [View] to view the errors. Use the knob to scroll through the error numbers. Press [>] to view the text of the error message. Press [>] again to increase the scrolling speed (the final key press cancels the scroll). All errors are cleared when you exit the menu.
Remote Interface Operation
SYSTem:ERRor? Read and clear one error from the queue
Errors have the following format (the error string may contain up to 80 characters):
- 113,"Undefined header"
34980A Service Guide 81
4 Troubleshooting and Diagnostics
Error Numbers
The following sections list the error numbers and error descriptions that may be reported by the instrument. Not all these errors indicate a hardware failure.
Execution Errors
These errors typically do not indicate a hardware failure. They are related to illegal or improper operation of the instrument using the remote interface.
Erro r
Description
-101 "Invalid character"
-102 "Syntax error"
-103 "Invalid separator"
-113 "Undefined header"
-123 "Numeric overflow"
-213 "INIT ignored"
-222 "Data out of range; value set to upper limit"
-222 "Data out of range; value set to lower limit"
-224 "Illegal parameter value ranges must be positive"
-230 "Data stale"
-231 "Internal software error"
-313 "Calibration memory lost; memory corruption detected"
-313 "Calibration memory lost; due to firmware revision change"
-314 "Save/recall memory lost; memory corruption detected"
-314 "Save/recall memory lost; due to firmware revision change"
-315 "Configuration memory lost; memory corruption detected"
-315 "Configuration memory lost; due to firmware revision change"
-321 "Out of memory; use definite length block for large traces"
-350 "Error queue overflow"
-350 "DMM processor error queue overflowed"
-410 "Query INTERRUPTED"
-420 "Query UNTERMINATED"
82 34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
Instrument Errors
These errors typically do not indicate a hardware failure. They are related to improper settings usually in command parameters.
Error Description
111
112
113
"Channel list: slot number out of range"
"Channel list: channel number out of range"
"Channel list: empty scan list"
114
201
202
203
204
221
271
272
281
291
292
261
262
263
264
225
226
227
251
222
222
223
224
"Channel list: ABus channels not allowed as endpoint in range"
"Memory lost: stored state"
"Memory lost: power-on state"
"Memory lost: stored readings"
"Memory lost: time and date"
"Settings conflict: calculate limit state forced off"
"Settings conflict: module type does not match state"
"Settings conflict: Scan list cleared"
"Settings conflict: trig source changed to IMM"
"Settings conflict: chan adv source changed to IMM"
"Settings conflict: DMM disabled or missing"
"Settings conflict: DMM enabled"
"Settings conflict: DMM not installed"
"Unsupported temperature transducer type"
"Not able to execute while scan initiated"
"Not able to abort scan"
"Not able to execute while DMM is measuring"
"Not a scannable channel"
"Not able to accept unit names longer than 3 characters"
"Not able to accept character in unit name"
"Not able to perform on more than one channel"
"Not able to recall state: it is empty"
"Not able to recall state: DMM enable changed"
83
4 Troubleshooting and Diagnostics
522
522
531
532
532
540
540
550
550
551
501
502
514
514
521
521
306
307
308
309
310
311
Error Description
301 "Module currently committed to scan"
302 "No module was detected in this slot"
303
304
305
"Module is not able to perform requested operation"
"Does not exist"
"Not able to perform requested operation"
"Part of a 4-wire pair"
"Incorrectly configured ref channel"
"Channel not able to perform requested operation"
"Incorrectly formatted channel list"
"Operation refused because channel is locked open"
"Not able to specify resolution with Auto range"
"Isolator UART framing error"
"Isolator UART overrun error"
"Not allowed"
"Not allowed; Instrument locked by another I/O session"
"Communications: input buffer overflow"
"Input buffer overflow"
"Output buffer overflow"
"Communications: output buffer overflow"
"Insufficient memory"
"Cannot achieve requested resolution"
"Not able to achieve requested resolution"
"Cannot use overload as math reference"
"Not able to null channel in overload"
"Command not allowed in local"
"Not able to execute command in local mode"
"Unknown Dmm Inguard Error"
84 34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
Self-Test Errors
These errors can indicate a hardware failure. The first two errors, 601 and
602, can indicate a failure of the communications board. The remaining errors are typically caused by a failure on the internal DMM.
Error Description
601 "Self-test: front panel not responding"
602 "Self-test: RAM read/write"
615
616
617
618
619
620
621
622
623
624
625
626
609
610
611
612
613
614
603
604
605
606
607
608
"Self-test: A/D sync stuck"
"Self-test: A/D slope convergence"
"Self-test/Cal: not able to calibrate rundown gain"
"Self-test/Cal: rundown gain out of range"
"Self-test: rundown too noisy"
"Serial configuration readback failed"
"DC gain x1 failed"
"DC gain x10 failed"
"DC gain x100 failed"
"Ohms 500 nA source failed"
"Ohms 5 uA source failed"
"DC 1000V zero failed"
"Ohms 10 uA source failed"
"DC current sense failed"
"Ohms 100 uA source failed"
"DC high voltage attenuator failed"
"Ohms 1 mA source failed"
"AC rms zero failed"
"AC rms full scale failed"
"Frequency counter failed"
"Cannot calibrate precharge"
"Unable to sense line frequency"
"I/O processor does not respond"
"I/O processor failed self-test"
85
4 Troubleshooting and Diagnostics
86
Calibration Errors
The following errors indicate failures that may occur during a calibration.
Often, performing the calibration again will clear these errors.
Error Description
741
742
743
744
745
746
747
747
730
731
732
733
734
735
736
740
748
748
748
748
748
749
709
710
711
720
721
722
723
724
725
701
702
703
704
705
706
707
708
"Cal security disabled by jumper"
"Cal: secured"
"Cal: invalid secure code"
"Cal: secure code too long"
"Cal: aborted"
"Cal: value out of range"
"Cal: signal measurement out of range"
"Cal: signal frequency out of range"
"Cal: no cal for this function or range"
"Cal: full scale correction out of range"
"Cal: cal string too long"
"Cal: DCV offset out of range"
"Cal: DCI offset out of range"
"Cal: RES offset out of range"
"Cal: FRES offset out of range"
"Cal: extended resistance self cal failed"
"Cal: 300V DC correction out of range"
"Cal: precharge DAC convergence failed"
"Cal: A/D turnover correction out of range"
"Cal: AC flatness DAC convergence failed"
"Cal: AC low frequency convergence failed"
"Cal: AC low frequency correction out of range"
"Cal: AC rms converter noise correction out of range"
"Cal: AC rms 100th scale correction out of range"
"Cal data lost: secure state"
"Cal data lost: string data"
"Cal data lost: DCV corrections"
"Cal data lost: DCI corrections"
"Cal data lost: RES corrections"
"Cal data lost: FRES corrections"
"Cal data lost: AC corrections"
"Calibration failed"
"Cal checksum failed, GPIB address"
"Cal checksum failed, internal data"
"Cal: mainframe cal memory write failure"
"Cal: invalid while cal in progress"
"Firmware and FPGA revision mismatch"
"Cal: no cal in progress"
"DMM relay count data lost"
34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
Firmware Update Errors
These errors occur when attempting to update the mainframe, internal
DMM, or plug- in modules.
Erro r
Description
791 "Firmware update error; unable to begin download"
792 "Firmware update error; programming operation failed"
793 "Firmware update error; data record invalid character"
794 "Firmware update error; data record length mismatch"
795 "Firmware update error; data record checksum mismatch"
796 "Firmware update error; bad checksum for download start"
797 "Firmware update error; bad checksum for download complete"
798 "Firmware update error; download in progress"
799
800
810
811
"Firmware update error; unable to complete download"
"Firmware update error; invalid programming address"
"State has not been restored"
"Operation has not been implemented"
87
4 Troubleshooting and Diagnostics
Plug-In Module Errors
These errors are related to the plug- in modules and often indicate a failing module.
924
925
926
927
928
929
930
931
932
919
920
921
922
923
913
914
915
916
917
918
906
907
908
910
911
912
Error Description
901 "Module hardware: unexpected data received"
902 "Module hardware: missing stop bit"
903
904
905
"Module hardware: data overrun"
"Module hardware: protocol violation"
"Module hardware: early end of data"
"Module hardware: missing end of data"
"Module hardware: module SRQ signal stuck low"
"Module hardware: not responding"
"Module reported an unknown module type"
"Module reported command buffer overflow"
"Module reported command syntax error"
"Module reported nonvolatile memory fault"
"Module reported temperature sensor fault"
"Module reported firmware defect"
"Firmware update required (www.agilent.com/find/34980AUpdates)"
"Module reported overvoltage"
"Module reported that maximum number of switches are closed"
"Module reported that switch is missing"
"Module reported that FPGA update failed"
"Module reported that its boot test failed"
"Module reported error byte containing unknown error(s)"
"DAC Module reported no trace assigned to channel"
933
934
"Module reported trace download failed"
"Module does not support trace"
"Invalid width for digital channel"
"Trace does not exist"
"Module reported ABus safety interlock activated"
"Module reported overtemperature"
"Module backplane error"
"Backplane module transaction failed"
"Safety Interlock prevents completion of this command. Check Terminal connection."
"Revision mismatch between module firmware and FPGA"
"Backplane interrupt line stuck asserted, service disabled"
88 34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
950
951
952
953
954
955
956
944
945
946
947
948
949
Error Description
935 "Trace of that name already exists"
936
937
940
941
942
943
"Cannot delete active trace"
"Digital channel not capable of specified width"
"State of switch unknown"
"No remote module present"
"Remote module not powered"
"Remote module topology change"
"Channel drive is paired"
"Remote module commands are unsupported on this slot"
"Remote module is unable to perform requested operation"
"Channel is not accessible"
"Invalid/missing remote module specifier"
"Open operation not valid for this channel configuration"
"Illegal operation when channel drive enabled"
"Switch failed to verify as expected"
"Internal channel drive illegal for remote slave module"
"Overcurrent detected"
"Remote modules configured in an illegal topology"
"Illegal operation when remote module's channel drive disabled"
"Module hardware: unexpected transaction termination"
89
4 Troubleshooting and Diagnostics
Isolate a Problem with a Plug-In Module
Any module that fails the mainframe self- test or generates a mainframe error must be replaced at the module level. Only the relay and FET switches have field replaceable parts. The following table summarizes the repair strategy for the plug- in modules.
Model
Description
34921A 40-channel armature multiplexer
34923A 40/80-channel reed multiplexer
34925A 40/80-channel optically isolated FET multiplexer
34922A 70-channel armature multiplexer
34924A 70-channel reed multiplexer
34931A Dual 4x8 armature matrix
Repair Strategy
Relay and Fuse replacement only
Relay replacement only
FET replacement only
Relay and Fuse replacement only
Relay replacement only
Relay replacement only
34932A Dual 4x16 armature matrix
34933A Dual/quad 4x8 reed matrix
Relay replacement only
Relay replacement only
34937A 32-channel Form C/Form A general-purpose switch Relay replacement only
34938A 20-channel 5-amp Form A switch Relay replacement only
34941A Quad 1x4 50-ohm 3-GHz RF multiplexer
34942A Quad 1x4 75-ohm 1.5 GHz RF multiplexer
34945A Microwave switch/attenuator driver
34946A Dual 1x2 SPDT terminated microwave switch
Module replacement
Module replacement
Module replacement
Module replacement
34947A Triple 1x2 SPDT unterminated microwave switch Module replacement
34950A 64-bit digital I/O with memory and counter Module replacement
34951A 4-channel isolated D/A converter Module replacement
34952A Multifunction module Module
34959A Breadboard module Module replacement
90 34980A Service Guide
Troubleshooting and Diagnostics 4
Relay and FET Replacement
Failing relays and FET switches can be isolate to a specific channel and replaced. There are two methods you can use to verify relays and switches:
• Read the relay cycle count.
• Measure the relay contact resistance.
The Agilent Y1131A Verification/Diagnostic Software Kit is a recommended tool and contains software and hardware used to test the relay switching modules available for the Agilent 34980A Multifunction Switch/Measure
Unit. The software provides module–specific tests to assist you with troubleshooting possible relay failures and predicting system maintenance requirements. Custom terminal blocks are provided to route signals and isolate individual relays for verification and diagnostics.
For several of the relay switching modules, it is very difficult to isolate a particular channel. The Y1131A Verification/Diagnostic Software used in conjunction with the provided verification terminal blocks attempts to isolate measurement channels in a repeatable manner.
34980A Service Guide 91
4 Troubleshooting and Diagnostics
34921A 40-Channel Armature Multiplexer with Low Thermal Offset
The 34921A 40- Channel Armature Multiplexer (40- Ch Arm MUX) is divided into two banks with 20 latching armature switches (channels 1- 20 and 21- 40) in each. This module also offers four additional fused relays
(channels 41- 44) for making AC and DC current measurements with the internal DMM with no external shunts needed. These current channels feature “make- before- break” connections to ensure continuous current flow when switching from one current channel to another. The current fuses are replaceable.
This module also contains nine armature Analog Bus relays (channels 911-
914, 921- 924, and 931), four on each bank that can connect the bank relays to the system Analog Buses and one that connects the current relays to the current input of the DMM. Through ABus1 and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements. Refer to the simplified schematic below.
92 34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
For the 34921A, relay and fuse part numbers are given on page 126 and
the component locator is shown on
. The table below shows the relationship of channel numbers to relay numbers.
Bank 1
012
013
014
015
008
009
010
011
Channel
001
002
003
004
005
006
007
016
017
018
019
020
K616
K617
K618
K619
Backplane
K620
K911
K912
911
912
913
914
041
K913
K914
Current*
K841, K841S,
F1041
042 K842, K842S,
F1042
931
Current Backplane
K931
K608
K609
K610
K611
K612
K613
K614
K615
Relay
K601
K602
K603
K604
K605
K606
K607
031
032
033
034
027
028
029
030
Bank 2
Channel Relay
021
022
K721
K722
023
024
025
026
K723
K724
K725
K726
K727
K728
K729
K730
K731
K732
K733
K734
035
036
037
038
039
040
921
922
923
924
043
044
K735
K736
K737
K738
K739
K740
Backplane
K921
K922
K923
K924
Current*
K843, K843S,
F1043
K844, K844S,
F1044
*The current switches use two relays to create a “make-before-break” circuit. You should replace both relays.
93
4 Troubleshooting and Diagnostics
34922A 70-Channel Armature Multiplexer
The high- density 34922A 70- Channel Armature Multiplexer (70- Ch Arm
MUX) is divided into two banks with 35 latching armature switches
(channels 1- 35 and 36- 70) in each. This module also contains eight armature Analog Bus relays (channels 911- 914 and 921- 924), four on each bank that can connect the bank relays to the system Analog Buses.
Through ABus1 and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements. Refer to the simplified schematic below.
94
For the 34922A, relay part numbers are given on page 126
and the
component locator is shown on page 137 . The table on the next page
shows the relationship of channel numbers to relay numbers.
34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
911
912
913
914
Bank 1
K631
K632
K633
K634
Backplane
K635
K625
K626
K627
K628
K629
K630
K811
K812
K813
K814
K617
K618
K619
K620
K621
K622
K623
K624
K611
K612
K613
K614
K615
K616
Relay
K601
K602
K603
K604
K605
K606
K607
K608
K609
K610
017
018
019
020
021
022
023
024
011
012
013
014
015
016
Channel
001
002
003
004
005
006
007
008
009
010
031
032
033
034
035
025
026
027
028
028
030
066
067
068
069
070
060
061
062
063
064
065
052
053
054
055
056
057
058
059
046
047
048
049
050
051
Bank 2
Channel Relay
036 K736
037
038
039
K737
K738
K739
040
041
042
043
044
045
K740
K741
K742
K743
K744
K745
K752
K753
K754
K755
K756
K757
K758
K759
K746
K747
K748
K749
K750
K751
921
922
923
924
Backplane
K760
K761
K762
K763
K764
K765
K766
K767
K768
K769
K770
K821
K822
K823
K824
95
4 Troubleshooting and Diagnostics
34923A 40/80-Channel Reed Multiplexer
The 34923A 40/80- Channel Reed Multiplexer (40/80- Ch Reed MUX) is divided into two equal banks of non- latching reed switches. This module also contains eight armature Analog Bus relays (channels 911- 914 and
921- 924), four on each bank that can connect the bank relays to the system Analog Buses. You can connect any of the channels to the internal
DMM through ABus1 and ABus2 for voltage or resistance measurements.
Using program commands or the mainframe front panel, you can control each of the channel switches individually, and configure this module for differential (2- wire or 4- wire) or single- ended (1- wire) mode. Refer to the simplified schematic for two- or four- wire modes.
96 34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
For the 34923A, relay part numbers are given on page 127
and the
component locator is shown on page 138 . The table below shows the
relationship of channel numbers to relay numbers.
011
012
013
014
007
008
009
010
2-, 4-Wire
Channel
001
002
003
004
005
006
015
016
017
018
019
020
911
912
913
914
Bank 1
1-wire
Channel
001, 002
003, 004
005, 006
007, 008
009, 010
011, 012
013, 014
015, 016
017, 018
019, 020
021, 022
023, 024
025, 026
027, 028
029, 030
031, 032
033, 034
035, 036
037, 038
039, 040
Backplane
Relay
K404
K404
K401
K401
K403
K404
K405
K402
K401
K401
K402
K403
K405
K401
K402
K403
K403
K404
K405
K405
K611
K612
K613
K614
031
032
033
034
027
028
029
030
2-, 4-Wire
Channel
021
022
023
024
025
026
035
036
037
038
039
040
Bank 2
1-Wire
Channel
041, 042
043, 044
045, 046
047, 048
049, 050
051, 052
053, 054
055, 056
057, 058
059, 060
061, 062
063, 064
065, 066
067, 068
069, 070
071, 072
073, 074
075, 076
077, 078
079, 080
Backplane
921
922
923
924
Relay
K504
K504
K501
K501
K503
K504
K505
K502
K501
K501
K502
K503
K505
K501
K502
K503
K503
K504
K505
K505
K621
K622
K623
K624
97
4 Troubleshooting and Diagnostics
34924A 70-Channel Reed Multiplexer
The high- density 34924A 70- Channel Reed Multiplexer (70- Ch Reed MUX) is divided into two banks with 35 non- latching reed switches (channels
1- 35 and 36- 70) in each. This module also contains eight armature Analog
Bus relays (channels 911- 914 and 921- 924), four on each bank that can connect the bank relays to the system Analog Buses. Through ABus1 and
ABus2 you can connect any of the channels to the system DMM for voltage or resistance measurements. See the simplified schematic below.
98 34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
911
912
913
914
Bank 1
K401
K404
K406
K406
Backplane
K611
K612
K613
K614
K409
K407
K402
K404
K406
K407
K409
K402
K402
K403
K404
K409
K407
K401
K403
K404
K404
K409
K407
K401
K404
K404
K408
K408
Relay
K401
K403
K404
K408
K408
K402
K403
024
025
026
027
028
028
030
031
016
017
018
019
020
021
022
023
032
033
034
035
008
009
010
011
012
013
014
015
Channel
001
002
003
004
005
006
007
For the 34924A, relay part numbers are given on page 127
and the
component locator is shown on page 139 . The table below shows the
relationship of channel numbers to relay numbers.
055
056
057
058
059
060
061
062
047
048
049
050
051
052
053
054
063
064
065
066
067
068
069
070
Bank 2
Channel Relay
036 K501
037
038
K503
K504
039
040
041
042
043
044
045
046
K508
K508
K502
K503
K504
K509
K507
K501
921
922
923
924
K507
K501
K503
K504
K509
K507
K502
K505
K505
K504
K508
K508
K502
K503
K505
K509
K506
K507
K509
K502
K501
K505
K506
K506
Backplane
K621
K622
K623
K624
99
4 Troubleshooting and Diagnostics
34925A 40/80-Channel Optically-Isolated FET Multiplexer
The 34925A 40/80- Channel Optically- Isolated FET Multiplexer (40/80- Ch
FET MUX) module is a high- speed and high- density FET MUX for high throughput production test. This module is divided into two equal banks of non- latching FET switches. This module also contains four armature
Analog Bus relays. Through ABus1 and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements.
When the power is off, all channel and Analog Bus relays open.
Using program commands or the mainframe front panel, you can control each of the FET channel switches individually, and configure this module for differential (2- wire or 4- wire) or single- ended (1- wire) mode. Refer to the simplified 2- , 4- wire schematic below.
100 34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
For the 34925A, FET part numbers are given on page 127 and the
component locator is shown on page 140 . The table below shows the
relationship of channel numbers to relay numbers.
2-, 4-Wire
Channel
001
002
003
004
005
006
Bank 1
1-wire
Channel
001, 002
003, 004
005, 006
007, 008
007
008
009
010
009, 010
011, 012
013, 014
015, 016
011
012
013
014
017, 018
019, 020
021, 022
023, 024
015
016
017
018
019
020
025, 026
027, 028
029, 030
031, 032
033, 034
035, 036
037, 038
039, 040
Backplane
911
912
913
914
FET
U609
U610
U611
U612
U613
U614
U615
U616
U601
U602
U603
U604
U605
U606
U607
U608
U617
U618
U619
U620
Relay
K800
K801
K802
K803
2-, 4-Wire
Channel
021
022
023
024
025
026
Bank 2
1-Wire
Channel
041, 042
043, 044
045, 046
047, 048
027
028
029
030
049, 050
051, 052
053, 054
055, 056
031
032
033
034
057, 058
059, 060
061, 062
063, 064
035
036
037
038
039
040
065, 066
067, 068
069, 070
071, 072
073, 074
075, 076
077, 078
079, 080
Backplane
921
922
923
924
FET
U709
U710
U711
U712
U713
U714
U715
U716
U701
U702
U703
U704
U705
U706
U707
U708
U717
U718
U719
U720
Relay
K804
K805
K806
K807
101
4 Troubleshooting and Diagnostics
34931A Dual 4x8 Armature Matrix
The 34931A dual 4x8 armature matrix contains two matrices, each with 32
2- wire crosspoint latching armature relays organized in a 4- row by 8- column configuration. Every row and column are made up of two wires each, a high (H) and a low (L). Each crosspoint relay has a unique channel number representing the row and column that intersects to create the crosspoint. For example, channel 304 represent the crosspoint connection between row 3 and column 4 (all columns consisting of two digits; in this case the digits are 04). See the simplified schematic below.
102
Matrix 1 and Matrix 2 are electrically separate from one another.
Matrix Relays: Armature latching. Analog Bus Relays: Armature non-latching.
34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
For the 34931A, relay part numbers are given on page 128
and the
component locator is shown on page 142 . The table below shows the
relationship of channel numbers to relay numbers.
Matrix 1
Relay
K7101
K7102
K7103
K7104
K7105
K7106
K7107
K7108
K7201
K7202
K7203
K7204
K7205
K7206
K7207
K7208
K7301
K7302
K7303
K7304
K7305
K7306
K7307
K7308
K7401
K7402
K7403
K7404
K7405
K7406
K7407
K7408
301
302
303
304
305
203
204
205
206
207
208
Channel
101
102
103
104
105
106
107
108
201
202
404
405
406
407
408
306
307
308
401
402
403
804
805
806
807
808
706
707
708
801
802
803
701
702
703
704
705
603
604
605
606
607
608
Matrix 2
Channel Relay
501 K8501
502
503
504
K8502
K8503
K8504
505
506
507
508
601
602
K8505
K8506
K8507
K8508
K8601
K8602
K8603
K8604
K8605
K8606
K8607
K8608
K8701
K8702
K8703
K8704
K8705
921
922
923
924
K8706
K8707
K8708
K8801
K8802
K8803
K8804
K8805
K8806
K8807
K8808
Backplane
K921
K922
K923
K924
103
4 Troubleshooting and Diagnostics
34932A Dual 4x16 Armature Matrix
The 34932A dual 4x16 armature matrix contains two matrices, each with
64 2- wire crosspoint latching armature relays organized in a 4- row by
16- column configuration. Every row and column are made up of two wires each, a high (H) and a low (L). Each crosspoint relay has a unique channel number representing the row and column that intersect to create the crosspoint. For example, channel 315 represents the crosspoint connection between row 3 and column 15 (all columns consisting of two digits; in this case the digits are 15). See the simplified schematic below.
104
Matrix 1 and Matrix 2 are electrically separate from one another.
Matrix Relays: Armature latching. Analog Bus Relays: Armature non-latching
34980A Service Guide
34980A Service Guide
Troubleshooting and Diagnostics 4
For the 34932A, relay part numbers are given on page 129
and the component locator is shown on
. The table below and on the next page shows the relationship of channel numbers to relay numbers.
Matrix 1
Relay
K7101
K7102
K7103
K7104
K7105
K7106
K7107
K7108
K7109
K7110
K7111
K7112
K7113
K7114
K7115
K7116
K7201
K7202
K7203
K7204
K7205
K7206
K7207
K7208
K7209
K7210
K7211
K7212
K7213
K7214
K7215
K7216
201
202
203
204
205
111
112
113
114
115
116
Channel
101
102
103
104
105
106
107
108
109
110
212
213
214
215
216
206
207
208
209
210
211
612
613
614
615
616
606
607
608
609
610
611
601
602
603
604
605
511
512
513
514
515
516
Matrix 2
Channel Relay
501 K8501
502
503
504
K8502
K8503
K8504
505
506
507
508
509
510
K8505
K8506
K8507
K8508
K8509
K8510
K8511
K8512
K8513
K8514
K8515
K8516
K8601
K8602
K8603
K8604
K8605
K8606
K8607
K8608
K8609
K8610
K8611
K8612
K8613
K8614
K8615
K8616
105
4 Troubleshooting and Diagnostics
.
Matrix 1
Relay
K7301
K7302
K7303
K7304
K7305
K7306
K7307
K7308
K7309
K7310
K7311
K7312
K7313
K7314
K7315
K7316
K7401
K7402
K7403
K7404
K7405
K7406
K7407
K7408
K7409
K7410
K7411
K7412
K7413
K7414
K7415
K7416
401
402
403
404
405
406
407
408
311
312
313
314
315
316
409
410
411
412
413
414
415
416
Channel
301
302
303
304
305
306
307
308
309
310
801
802
803
804
805
806
807
808
711
712
713
714
715
716
809
810
811
812
813
814
815
816
Matrix 2
Channel Relay
701 K8701
702
703
704
K8702
K8703
K8704
705
706
707
708
709
710
K8705
K8706
K8707
K8708
K8709
K8710
921
922
923
924
K8711
K8712
K8713
K8714
K8715
K8716
K8801
K8802
K8803
K8804
K8805
K8806
K8807
K8808
K8809
K8810
K8811
K8812
K8813
K8814
K8815
K8816
Backplane
K921
K922
K923
K924
106 34980A Service Guide
Troubleshooting and Diagnostics 4
34933A Dual/Quad 4x8 Reed Matrix
Using program commands or the front panel of the 34980A, you can configure the 34933A dual/quad 4x8 reed matrix module for differential
(2- wire) mode or single- ended (1- wire) mode.
The 34933A module contains 100
in- rush resistors that are used to protect the reed relays from reactive loads. If you have applications where in- rush resistors interfere with measurements, connections are provided on the terminal blocks for you to bypass the in- rush resistors that are located on the columns.
Two-Wire Mode
In 2- wire mode, the 34933A module contains two matrices, each with 32
2- wire crosspoint non- latching reed relays organized in a 4- row by
8- column configuration. Every row and column are made up of two wires each, a high (H) and a low (L). Each crosspoint relay has a unique channel number representing the row and column that intersect to create the crosspoint. For example, channel 308 represents the crosspoint connection between row 3 and column 08 (all columns consisting of two digits; in this case the digits are 08). See the simplified schematic on
.
One-Wire Mode
In 1- wire mode, the 34933A module contains four matrices (1 through 4), each with 32 1- wire crosspoint non- latching reed relays organized in a
4- row by 8- column configuration. Every row and column has one wire each. Each crosspoint relay has a unique channel number representing the matrix, and the single- wire row and column that intersect to make the crosspoint. For example, channel 218 represents Matrix 2, row 1 and column 8. See the simplified schematic on page 109 .
34980A Service Guide 107
4 Troubleshooting and Diagnostics
34933A Two-Wire Mode
NOTE: Three-digit channel numbers are derived from the intersection of the rows and columns, columns having two digits. The intersectoin shown here represents Channel 308 (Row 3, Column 8).
NOTE:
Matrix Relays: Reed non-latching
Analog Bus Relays: Armature non-latching
NOTE: Although columns are numbered the same on Matrix 1 and Matrix 2, they are electrically seperate from one another.
NOTE: All series resistors shown are 100
Ω.
108 34980A Service Guide
34933A One-Wire Mode
Troubleshooting and Diagnostics 4
34980A Service Guide
For the 34933A, relay part numbers are given on page 130
and the
component locator is shown on page 144 . The table on the next page
shows the relationship of channel numbers to relay numbers.
109
4 Troubleshooting and Diagnostics
118, 218
121, 221
122, 222
123, 223
124, 224
125, 225
126, 226
127, 227
128, 228
131, 231
132, 232
133, 233
Matrix 1
1-Wire
Channel
111, 211
112, 212
113, 213
114, 214
115, 215
116, 216
117, 217
134, 234
135, 235
136, 236
137, 237
138, 238
141, 241
142, 242
143, 243
144, 244
145, 245
146, 246
147, 247
148, 248
301
302
303
304
305
306
307
308
203
204
205
206
207
208
401
402
403
404
405
406
407
408
2-Wire
Channel
101
102
103
104
105
106
107
108
201
202
Relay
K505
K508
K507
K506
K504
K503
K502
K501
K507
K506
K504
K503
K502
K501
K505
K508
K507
K506
K504
K503
K502
K501
K505
K508
K507
K506
K504
K503
K502
K501
K505
K508
701
702
703
704
705
706
707
708
603
604
605
606
607
608
801
802
803
804
805
806
807
808
2-Wire
Channel
501
502
503
504
505
506
507
508
601
602
921
922
923
924
318, 418
321, 421
322, 422
323, 423
324, 424
325, 425
326, 426
327, 427
328, 428
331, 431
332, 432
333, 433
Matrix 2
1-Wire
Channel
311, 411
312, 412
313, 413
314, 414
315, 415
316, 416
317, 417
334, 434
335, 435
336, 436
337, 437
338, 438
341, 441
342, 442
343, 443
344, 444
345, 445
346, 446
347, 447
348, 448
Backplane
Relay
K605
K608
K607
K606
K604
K603
K602
K601
K607
K606
K604
K603
K602
K601
K605
K608
K607
K606
K604
K603
K602
K601
K605
K608
K607
K606
K604
K603
K602
K601
K605
K608
K704
K703
K702
K701
110 34980A Service Guide
Troubleshooting and Diagnostics 4
34937A 32-Channel GP Switch
The 34937A general- purpose switch module provides independent
control of:
• Twenty- eight Form C (DPST) latching relays rated at 1 A
• Four Form A (SPST) latching relays rated at 5 A.
A simplified schematic is shown below.
34980A Service Guide
For the 34937A, relay part numbers are given on page 130
and the
component locator is shown on page 145 . The table below shows the
relationship of channel numbers to relay numbers.
Bank 1 Bank 2
Channel
001
002
003
004
005
006
007
008
009
010
011
012
013
029
030
Form A
K608
K609
K610
K611
K612
K613
Relay
K601
K602
K603
K604
K605
K606
K607
K629
K630
Channel Relay
015 K615
016
017
K616
K617
018
019
020
021
K618
K619
K620
K621
022
023
024
024
026
027
K622
K623
K624
K625
K626
K627
Form A
031
032
K631
K632
111
4 Troubleshooting and Diagnostics
34938A 20-Channel High-Current GP Switch
The 34938A high- current GP switch module provides twenty 5 A Form A relays for general purpose switching needs.
For the 34938A, relay part numbers are given on page 130
and the
component locator is shown on page 146 . The table below shows the
relationship of channel numbers to relay numbers.
Bank 1 Bank 2
Channel
001
002
003
004
005
006
007
008
009
010
Relay
K501
K502
K503
K504
K505
K506
K507
K508
K509
K510
Channel Relay
011 K511
012
013
K512
K513
014
015
016
017
K514
K515
K516
K517
018
019
020
K518
K519
K520
112 34980A Service Guide
Agilent 34980A Multifunction Switch/Measure Unit
Service Guide
5
Disassembly and Repair
Electrostatic Discharge (ESD) Precautions 114
Agilent Technologies
113
5 Disassembly and Repair
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 instrument or one of the plug- in modules.
• Disassembly the instrument only in a static- free work area.
• Use a conductive work area to dissipate any static charge.
• Use a conductive wrist strap to dissipate static charge accumulation.
• Minimize handling.
• Keep replacement parts in their original static- free packaging.
• Remove all plastic, foam, vinyl, paper, and other static- generating materials from the immediate work area.
• Use only anti- static solder suckers.
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 results in permanent damage to the printed circuit board.
Tools Required
The following tools are required for basic disassembly.
• T20 Torx driver
• 3/16” nut driver (for rear panel connectors)
• 9/32” nut driver (for GP- IB connector)
• #2 Pozidrive (for fan)
114 34980A Service Guide
Disassembly and Repair 5
Basic Disassembly
Observe the electrostatic discharge precautions given on
.
1 Remove the power cable from the unit. If attached, remove the analog bus connector.
a If desired, you may also remove the feet by lifting the tab on each foot and sliding the foot toward the rear of the instrument.
2
3
Remove all plug- in modules.
Using a T- 20 Torx driver, loosen the five captive screws in the rear bezel and remove the bezel. The metal cover will now slide off.
34980A Service Guide 115
5 Disassembly and Repair
Power Supply Removal
1 Remove the two T20 Torx screws securing the power supply module.
2 Swing the module out and disengage it from the sheet metal at
the back.
116
Note: For testing purposes, y
ou can stand the
power supply on end and insert it into slots
in the mainframe as shown.
34980A Service Guide
Disassembly and Repair 5
3 To completely remove the power supply, unplug the main power input
(brown and blue) and the green/yellow ground wire from the power supply printed circuit board. Unplug the fan power and dc power from the KOM pc board.
Power Supply Disassembly
1 To disassembly the power supply, press the catch on the power supply shield and slide the shield to release it.
2 Remove the safety shield. Using a T20 Torx, remove the four screws holding the power supply printed circuit board to the sheet metal.
34980A Service Guide 117
5 Disassembly and Repair
KOM Removal
1
2
3
4
Remove the power supply (see the procedure on
Disconnect the two ribbon cables on the top of the chassis.
Use a 3/16” nut driver to remove the nuts holding the Ext Trig DB9 connector on the rear panel. Use a 9/32” nut driver to remove the nuts holding the GP- IB connector on the rear panel.
Use a T20 Torx to remove the four screws holding the KOM printed circuit assembly to the mainframe. Lift out the assembly.
118 34980A Service Guide
Disassembly and Repair 5
Front Panel Removal
1 Loosen the front panel assembly by lifting gently on the four plastic ears and moving the front panel off the mainframe. Stand the entire assembly on its side to make removal easier.
a b
Pull to unclip the ground connector from the mainframe.
Swing the two clips securing the front panel connector ribbon cable to the front panel circuit board and unplug the connector.
34980A Service Guide 119
5 Disassembly and Repair
Front Panel Disassembly
1
2
Pull to remove the knob. Use a 7/16” nut driver to remove the nut from the knob shaft.
Remove the four T20 Torx screws from the circuit board and lift the circuit board out.
You can now lift out the keypad.
120 34980A Service Guide
Disassembly and Repair 5
DMM Removal
2
3
4
5
1 To remove the DMM (if installed), remove the front panel (see the
Unplug the ribbon cable at the top of the DMM assembly.
Remove the two T20 Torx screws from the left front side of the mainframe.
Move the DMM assembly to the right and lift out.
Unplug the input cable from the backplane printed circuit board.
34980A Service Guide 121
5 Disassembly and Repair
Backplane Removal
1
2
3
Remove the front panel (see the procedure on page 119 ) and the DMM
(see the procedure on
).
Use a 3/16” nut driver to remove the rear panel Analog Bus DB9 connector. Unclip the connector cable from the mainframe.
Remove the five T20 Torx screws holding the backplane assembly to the chassis and lift the printed circuit assembly out.
122 34980A Service Guide
Agilent 34980A Multifunction Switch/Measure Unit
Service Guide
6
Replaceable Parts
To Order Replaceable Parts 124
Backdating and Part Changes 124
Mainframe Replaceable Parts 125
34946A and 34947A Replaceable Parts 131
Agilent Technologies
123
6 Replaceable Parts
Replaceable Parts
This section contains information for ordering replacement parts for your instrument. Parts are listed in alphanumeric order according to their reference designators. The parts lists include a brief description of each part with applicable Agilent part number.
To Order Replaceable Parts
You can order replaceable parts from Agilent using the Agilent part number. Note that only field–replaceable parts are listed in this service guide. Parts not listed here are not field replaceable and assembly replacement is recommended. To order replaceable parts from Agilent, do the following:
1
2
3
Contact your nearest Agilent Sales Office or Service Center.
Identify the parts by the Agilent part number shown in the replaceable parts list.
Provide the instrument model number and serial number.
Backdating and Part Changes
Always refer to Chapter 7, “Backdating” before attempting repair or before
ordering replaceable parts. Parts changes, if any, are documented in the backdating chapter.
124 34980A Service Guide
Replaceable Parts 6
Mainframe Replaceable Parts
Refer to the disassembly drawings beginning on
Agilent Part Number
34980-66503
34980-66501
34980-67601
349980-61601
34980-61604
34980-61606
34980-61607
0950-4603
34980-48001
34980-48307
34980-66502
34980-49301
34970-87401
34980-04104
34980-48301
5041-9167
34980-48305
34980-48304
34980-66504
34980-68501
Description
PCA - backplane
PCA - KOM and Power Supply
Line Filter Assembly
Cable, KOM to Backplane
Cable, front panel to KOM and DMM
Cable, Power Supply
Cable, ground green/yellow
Power Supply Module
Keypad
Front Panel
PCA - Front Panel
Window
Knob
Mainframe Cover, sheet metal
Rear Bezel
Foot
Cover, Analog Output
Cover, Slot
PCA, DMM
Fan Assembly
34980A Service Guide 125
6 Replaceable Parts
126
34921A Replaceable Parts
A component locator is shown on page 136
.
Component Locator
F1041, F1042, F1043,
F1044
K601, K602, K603, K604,
K605, K606, K607, K608,
K609, K610, K611, K612,
K613, K614, K615, K616,
K617, K618, K619, K620,
K721, K722, K723, K724,
K725, K726, K727, K728,
K729, K730, K731, K732,
K733, K734, K735, K736,
K737, K738, K739, K740,
K841, K842, K843, K844,
K841S, K842S, K843S,
K844S
K911, K912, K913, K914,
K921, K922, K923, K924,
K931
Agilent P/N Description
0490-1896 RELAY 2C 3VDC-COIL
2A 30VDC
Vendor Vendor P/N
2110-0043 FUSE 1.5A 250V NTD FE
UL-LST
Littelfuse 031201.5
Omron G6SU-2-DC3
0490-1954 RELAY 2C 12VDC-COIL
2A 250VAC
Omron G6S-2-DC12
34922A Replaceable Parts
A component locator is shown on
.
Component Locator
K601, K602, K603, K604,
K605, K606, K607, K608,
K609, K610, K611, K612,
K613, K614, K615, K616,
K617, K618, K619, K620,
K621, K622, K623, K624,
K625, K626, K627, K628,
K629, K630, K631, K632,
K633, K634, K635, K736,
K737, K738, K739, K740,
K741, K742, K743, K744,
K745, K746, K747, K748,
K749, K750, K751, K752,
K753, K754, K755, K756,
K757, K758, K759, K760,
K761, K762, K763, K764,
K765, K766, K767, K768,
K769, K770
K811, K812, K813, K814,
K821, K822, K823, K824
Agilent P/N Description
0490-1896 RELAY 2C 3VDC-COIL
2A 30VDC
Vendor
Omron
0490-1954 RELAY 2C 12VDC-COIL
2A 250VAC
Omron
Vendor P/N
G6SU-2-DC3
G6S-2-DC12
34980A Service Guide
Replaceable Parts 6
34923A Replaceable Parts
A component locator is shown on
.
Component Locator
K401, K402, K403, K404,
K405, K501, K502, K503,
K504, K505
Agilent P/N Description Vendor
0490-2746 RLY-DRY-RD-1A-8 PC
BUNDLE 0.5A 12V 300V
Coto
K609, K611, K612, K613,
K614, K621, K622, K623,
K624
0490-1954 RELAY 2C 12VDC-COIL
2A 250VAC
Omron
34924A Replaceable Parts
A component locator is shown on
.
Component Locator
K401, K402, K403, K404,
K405, K406, K407, K408,
K409, K501, K502, K503,
K504, K505, K506, K507,
K508, K509
K611, K612, K613, K614,
K621, K622, K623, K624
Agilent P/N Description
0490-2746 RLY-DRY-RD-1A-8 PC
BUNDLE 0.5A 12V 300V
Vendor
Coto
0490-1954 RELAY 2C 12VDC-COIL
2A 250VAC
Omron
Vendor P/N
9000-0311
G6S-2-DC12
Vendor P/N
9000-0311
G6S-2-DC12
34925A Replaceable Parts
Component locators begin on
Component Locator
U601, U602, U603, U604,
U605, U606, U607, U608,
U609, U610, U611, U612,
U613, U614, U615, U616,
U617, U618, U619, U620,
U701, U702, U703, U704,
U705, U706, U707, U708,
U709, U710, U711, U712,
U713, U714, U715, U716,
U717, U718, U719, U720
K800, K801, K802, K803,
K804, K805, K806, K807
Agilent P/N Description Vendor Vendor P/N
1990-3295 SOLID STATE RELAY IF
50mA-MAX BVR 3V SMT
Matsushita AQW227NA
0490-1954 RELAY 2C 12VDC-COIL
2A 250VAC
Omron G6S-2-DC12
34980A Service Guide 127
6 Replaceable Parts
34931A Replaceable Parts
A component locator is shown on
.
Component Locator
K7101, K7102, K7103,
K7104, K7105, K7106,
K7107, K7108, K7201,
K7202, K7203, K7204,
K7205, K7206, K7207,
K7208, K7301, K7302,
K7303, K7304, K7305,
K7306, K7307, K7308,
K7401, K7402, K7403,
K7404, K7405, K7406,
K7407, K7408, K8501,
K8502, K8503, K8504,
K8505, K8506, K8507,
K8508, K8601, K8602,
K8603, K8604, K8605,
K8606, K8607, K8608,
K8701, K8702, K8703,
K8704, K8705, K8706,
K8707, K8708, K8801,
K8802, K8803, K8804,
K8805, K8806, K8807,
K8808
Agilent P/N Description
0490-1896 RELAY 2C 3VDC-COIL
2A 30VDC
Vendor
Omron
K921, K922, K923, K924 0490-1954 RELAY 2C 12VDC-COIL
2A 250VAC
Omron
Vendor P/N
G6SU-2-DC3
G6S-2-DC12
128 34980A Service Guide
Replaceable Parts 6
34932A Replaceable Parts
A component locator is shown on
.
Component Locator
K7101, K7102, K7103,
K7104, K7105, K7106,
K7107, K7108, K7109,
K7110, K7111, K7112,
K7113, K7114, K7115,
K7116, K7201, K7202,
K7203, K7204, K7205,
K7206, K7207, K7208,
K7209, K7210, K7211,
K7212, K7213, K7214,
K7215, K7216, K7301,
K7302, K7303, K7304,
K7305, K7306, K7307,
K7308, K7309, K7310,
K7311, K7312, K7313,
K7314, K7315, K7316,
K7401, K7402, K7403,
K7404, K7405, K7406,
K7407, K7408, K7409,
K7410, K7411, K7412,
K7413, K7414, K7415,
K7416, K8501, K8502,
K8503, K8504, K8505,
K8506, K8507, K8508,
K8509, K8510, K8511,
K8512, K8513, K8514,
K8515, K8516, K8601,
K8602, K8603, K8604,
K8605, K8606, K8607,
K8608, K8609, K8610,
K8611, K8612, K8613,
K8614, K8615, K8616,
K8701, K8702, K8703,
K8704, K8705, K8706,
K8707, K8708, K8709,
K8710, K8711, K8712,
K8713, K8714, K8715,
K8716, K8801, K8802,
K8803, K8804, K8805,
K8806, K8807, K8808,
K8809, K8810, K8811,
K8812, K8813, K8814,
K8815, K8816
Agilent P/N Description
0490-1896 RELAY 2C 3VDC-COIL
2A 30VDC
Vendor
Omron
K921, K922, K923, K924 0490-1954 RELAY 2C 12VDC-COIL
2A 250VAC
Omron
Vendor P/N
G6SU-2-DC3
G6S-2-DC12
34980A Service Guide 129
6 Replaceable Parts
34933A Replaceable Parts
A component locator is shown on
.
Component Locator
K501, K502, K503, K504,
K505, K506, K507, K508,
K601, K602, K603, K604,
K605, K606, K607, K608
Agilent P/N Description
BUNDLE 0.5A 12V 300V
Vendor
Coto
K921, K922, K923, K924 0490-1954 RELAY 2C 12VDC-COIL
2A 250VAC
Omron
Vendor P/N
9000-0311
G6S-2-DC12
34937A Replaceable Parts
A component locator is shown on
.
Component Locator
K601, K602, K603, K604,
K605, K606, K607, K608,
K609, K610, K611, K612,
K613, K614, K615, K616,
K617, K618, K619, K620,
K621, K622, K623, K624,
K625, K626, K627, K628
Agilent P/N Description
0490-1896 RELAY 2C 3VDC-COIL
2A 30VDC
K629, K630, K631, K632 0490-2731 RELAY 1A 9VDC-COIL
5A 30VDC THRU HOLE
Vendor
Omron
Vendor P/N
G6SU-2-DC3
Matsushita
DSP1A-L2-D
C9V-F
34938A Replaceable Parts
A component locator is shown on
page 146
.
Component Locator
K501, K502, K503, K504,
K505, K506, K507, K508,
K509, K510, K511, K512,
K513, K514, K515, K516,
K517, K518, K519, K520
Agilent P/N Description
0490-2731 RELAY 1A 9VDC-COIL
5A 30VDC THRU HOLE
Vendor Vendor
P/N
Matsushita
DSP1A-L2-
DC9V-F
130 34980A Service Guide
Replaceable Parts 6
34946A and 34947A Replaceable Parts
There are no replaceable parts on these modules. However, they support only the following N1810 switch options:
• Option 124 24 VDC coil options
• Option 201 “D” subminiature connectors
• Option 402 Position Indicators.
C A U T I O N
If the proper N1810 voltage option (Opt. 124) is not used, the switches could be damaged.
Vendor Addresses
Agilent Technologies, Inc.
3501 Stevens Creek Blvd
Santa Clara, CA 95052 U.S.A.
Omron Electronics LLC
55 East Commerce Drive
Schaumberg, IL 60173- 5302 U.S.A.
Coto Technology
55 DuPont Drive
Providence, RI 02907 U.S.A
Matsushita
c/o Panasonic Electric Works Corporation of America
629 Central Avenue
New Providence, NJ 07974 U.S.A
Littelfuse
800 East Northwest Highway
Des Plains, IL 60016 U.S.A
34980A Service Guide 131
6 Replaceable Parts
132 34980A Service Guide
Agilent 34980A Multifunction Switch/Measure Unit
Service Guide
7
Backdating
Agilent Technologies
133
7 Backdating
Backdating
This chapter contains information necessary to adapt this manual to instruments and assemblies not directly covered by the current content.
There are no backdated assemblies at the time of this printing.
134 34980A Service Guide
Agilent 34980A Multifunction Switch/Measure Unit
Service Guide
8
Diagrams
34925A Component Locator (Top) 140
34925A Component Locator (Bottom) 141
Agilent Technologies
135
8 Diagrams
34921A Component Locator
K931
K842 K841 K844 K843
K842S K841S K844S K843S
136
K607
K616
K602
K611
K606
K601
K608
K617
K612
K603
K604
K613
K618
K609
K614
K610
K619
K605
K615
K620
K728
K737
K732
K723
K727
K736
K722
K731
K726
K721
K724
K733
K738
K729
K734
K730
K739
K725
K735
K740
34980A Service Guide
34922A Component Locator
K811
Diagrams 8
34980A Service Guide
K608
K601
K632
K626
K616
K606
K622
K617
K607
K631
K621
K611
K618
K627
K612
K602
K633
K623 K743
K603
K634
K628
K635
K609
K619
K624
K630
K604
K614
K629
K625
K610
K736
K767
K620 K761
K615 K751
K605 K741
K753
K762
K747
K737
K768
K757
K752
K742
K766
K756
K746
K758
K738
K769
K763
K770
K744
K754
K759
K765
K739
K749
K764
K760
K745
K755
K750
K740
137
8 Diagrams
34923A Component Locator
K621
K611
K403 K503
138 34980A Service Guide
34924A Component Locator
K621
K611
Diagrams 8
34980A Service Guide 139
8 Diagrams
34925A Component Locator (Top)
K802
K806
K803
K807
K800
K804
K805
K801
140
U606 U616 U613 U618 U620 U706 U703 U713 U718 U720
U601 U603 U612 U614 U619 U701 U707 U712 U714 U719
34980A Service Guide
34925A Component Locator (Bottom)
Diagrams 8
34980A Service Guide
U715 U705 U708 U717 U702 U615 U605 U608 U617 U602
U710 U709 U704 U716 U711 U610 U609 U604 U607 U611
141
8 Diagrams
34931A Component Locator
K924
142
K7308 K7408 K7208 K7108
K7307 K7407 K7207 K7107
K7306 K7406 K7206 K7106
K7305 K7405 K7205 K7105
K8708 K8808
K8707 K8807
K8706 K8806
K8608 K8508
K8607 K8507
K8606 K8506
K8705 K8805 K8605 K8505
K7304 K7404 K7402 K7104
K7303 K7403 K7203 K7103
K8704 K8804
K8703 K8803
K8604 K8504
K8603 K8503
K7302 K7402 K7202 K7102 K8702 K8802 K8602 K8502
K7301 K7401 K7201 K7101 K8701 K8801 K8601 K8501
34980A Service Guide
34932A Component Locator
K924
Diagrams 8
34980A Service Guide
K7316 K7416 K7216 K7116
K7315 K7415 K7215 K7115
K7314 K7414 K7214 K7114
K7313
K7310
K7413 K7213
K7410 K7210
K7113
K7312 K7412 K7412 K7112
K7311 K7411 K7211 K7111
K7110
K8716 K8816 K8616 K8516
K8715 K8815 K8615 K8515
K8714 K8814 K8614 K8514
K8713 K8813 K8613 K8513
K8712 K8812 K8612 K8512
K8711 K8811 K8611 K8511
K8710 K8810 K8610 K8510
K7309 K7409 K7209 K7109 K8709 K8809 K8609 K8509
K7308 K7408 K7208 K7108
K7307 K7407 K7207 K7107
K8708 K8808 K8608 K8508
K7306 K7406 K7206 K7106
K8707 K8807 K8607 K8507
K8706 K8806 K8606 K8506
K7305 K7405 K7205 K7105
K7304 K7404 K7402 K7104
K8705 K8805
K8704 K8804
K8605 K8505
K8604 K8504
K7303 K7403 K7203 K7103
K7302 K7402 K7202 K7102
K8703 K8803 K8603 K8503
K8702 K8802 K8602 K8502
K7301 K7401 K7201 K7101 K8701 K8801 K8601 K8501
143
8 Diagrams
34933A Component Locator
144
K704
K507
K506
K505
K504
K503
K502
K501
K607
K606
K605
K604
K603
K602
K601
34980A Service Guide
34937A Component Locator
Diagrams 8
34980A Service Guide
K612
K603
K629
K602
K614
K626
K617
K630 K631
K616
K628
K632
145
8 Diagrams
34938A Component Locator
146
K508
K502
K509
K503
K518
K512
K519
K513
34980A Service Guide
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Table of contents
- 8 Front Panel at a Glance
- 9 Rear Panel at a Glance
- 10 Rear Panel Connector Pinouts
- 11 Annunciator Display Indicators
- 12 Front Panel Menu Reference
- 14 Instrument Rack Mounting
- 16 Contents
- 20 Obtaining Service
- 21 Obtaining Service
- 21 Operating Checklist
- 21 Types of Service Available
- 22 Repackaging for Shipment
- 22 Cleaning
- 23 Self Test Procedures
- 24 Electrostatic Discharge (ESD) Precautions
- 26 Specifications
- 27 Multiplexer Module Specifications and Characteristics
- 29 Matrix Modules Specifications and Characteristics
- 31 GP Actuator Module Specifications and Characteristics
- 32 RF and Microwave Module Specifications and Characteristics
- 34 34945A/34945EXT Module Specifications and Characteristics
- 35 34950A 64-channel Digital I/O Specifications and Characteristics
- 37 34951A 4-channel D/A Converter Specifications and Characteristics
- 39 34952A Multifunction Module Specifications and Characteristics
- 40 34959A Breadboard Module Specifications and Characteristics
- 41 Internal DMM Specifications and Characteristics
- 44 Typical System Speeds
- 46 Internal DMM Measurement Characteristics
- 49 System Specifications and Characteristics
- 51 Product Dimensions
- 52 To Calculate Total DMM Measurement Error
- 54 Interpreting Internal DMM Specifications
- 56 Configuring for Highest Accuracy Measurements
- 58 Calibration Procedures
- 59 Calibration Procedures
- 59 Agilent Technologies Calibration Services
- 59 Calibration Interval
- 59 Adjustment is Recommended
- 60 Time Required for Calibration
- 60 Automating Calibration Procedures
- 61 Recommended Test Equipment
- 62 Calibration Security
- 63 Calibration Message
- 63 Calibration Count
- 64 Calibration Process
- 64 Aborting a Calibration in Progress
- 65 Performance Verification Tests
- 67 Internal DMM
- 67 Input Connections
- 68 DMM Test Considerations
- 69 Internal DMM Verification Tests
- 75 Optional AC Performance Verification Tests
- 76 Internal DMM Adjustments
- 77 Gain Adjustment
- 81 Plug-in Modules
- 81 Plug-in Module Test Considerations
- 82 34951A 4-Ch Isolated DAC Module
- 87 34952A Multifunction Module
- 89 Relay Plug-in Modules
- 91 Thermocouple Reference Junction 34921A (Optional)
- 92 Troubleshooting and Diagnostics
- 93 Troubleshooting and Diagnostics
- 93 Troubleshooting Hints
- 94 Power Supply
- 94 Product Firmware Updates
- 95 Instrument Errors
- 97 Error Numbers
- 105 Isolate a Problem with a Plug-In Module
- 106 Relay and FET Replacement
- 107 34921A 40-Channel Armature Multiplexer with Low Thermal Offset
- 109 34922A 70-Channel Armature Multiplexer
- 111 34923A 40/80-Channel Reed Multiplexer
- 113 34924A 70-Channel Reed Multiplexer
- 115 34925A 40/80-Channel Optically-Isolated FET Multiplexer
- 117 34931A Dual 4x8 Armature Matrix
- 119 34932A Dual 4x16 Armature Matrix
- 122 34933A Dual/Quad 4x8 Reed Matrix
- 126 34937A 32-Channel GP Switch
- 127 34938A 20-Channel High-Current GP Switch
- 128 Disassembly and Repair
- 129 Electrostatic Discharge (ESD) Precautions
- 129 Surface Mount Repair
- 129 Tools Required
- 130 Basic Disassembly
- 131 Power Supply Removal
- 132 Power Supply Disassembly
- 133 KOM Removal
- 134 Front Panel Removal
- 135 Front Panel Disassembly
- 136 DMM Removal
- 137 Backplane Removal
- 138 Replaceable Parts
- 139 Replaceable Parts
- 139 To Order Replaceable Parts
- 139 Backdating and Part Changes
- 140 Mainframe Replaceable Parts
- 141 34921A Replaceable Parts
- 141 34922A Replaceable Parts
- 142 34923A Replaceable Parts
- 142 34924A Replaceable Parts
- 142 34925A Replaceable Parts
- 143 34931A Replaceable Parts
- 144 34932A Replaceable Parts
- 145 34933A Replaceable Parts
- 145 34937A Replaceable Parts
- 145 34938A Replaceable Parts
- 146 34946A and 34947A Replaceable Parts
- 146 Vendor Addresses
- 148 Backdating
- 149 Backdating
- 150 Diagrams
- 151 34921A Component Locator
- 152 34922A Component Locator
- 153 34923A Component Locator
- 154 34924A Component Locator
- 155 34925A Component Locator (Top)
- 156 34925A Component Locator (Bottom)
- 157 34931A Component Locator
- 158 34932A Component Locator
- 159 34933A Component Locator
- 160 34937A Component Locator
- 161 34938A Component Locator
- 2 Blank Page