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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

page vi

.

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

Rear Panel at a Glance iv

Rear Panel Connector Pinouts

v

Annunciator Display Indicators vi

Front Panel Menu Reference vii

Instrument Rack Mounting

vii

1 Obtaining Service

Operating Checklist

6

Types of Service Available

6

Repackaging for Shipment 7

Cleaning

7

Self Test Procedures

8

Electrostatic Discharge (ESD) Precautions 9

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

Typical System Speeds 29

Internal DMM Measurement Characteristics 31

System Specifications and Characteristics 35

Product Dimensions

37

To Calculate Total DMM Measurement Error

38

Interpreting Internal DMM Specifications 40

Configuring for Highest Accuracy Measurements 42

34980A Service Guide 1

2

3 Calibration Procedures

Agilent Technologies Calibration Services

44

Calibration Interval

44

Adjustment is Recommended 44

Time Required for Calibration

45

Automating Calibration Procedures

45

Recommended Test Equipment 46

Calibration Security

47

Calibration Message 48

Calibration Count

48

Calibration Process 49

Aborting a Calibration in Progress 49

Performance Verification Tests 50

Input Connections

52

DMM Test Considerations

53

Internal DMM Verification Tests

53

Optional AC Performance Verification Tests 59

Internal DMM Adjustments 60

Gain Adjustment 61

Plug-in Module Test Considerations

65

34951A 4-Ch Isolated DAC Module 66

34952A Multifunction Module

71

Relay Plug-in Modules 73

Thermocouple Reference Junction 34921A (Optional) 75

34980A Service Guide

4 Troubleshooting and Diagnostics

Troubleshooting Hints

78

Power Supply 79

Product Firmware Updates 79

Instrument Errors 80

Error Numbers 82

Isolate a Problem with a Plug-In Module

90

Relay and FET Replacement 91

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

5 Disassembly and Repair

Electrostatic Discharge (ESD) Precautions

114

Surface Mount Repair

114

Tools Required 114

Basic Disassembly 115

Power Supply Removal

116

Power Supply Disassembly

117

KOM Removal

118

Front Panel Removal 119

Front Panel Disassembly 120

DMM Removal 121

Backplane Removal

122

34980A Service Guide 3

4

6 Replaceable Parts

To Order Replaceable Parts

124

Backdating and Part Changes

124

Mainframe Replaceable Parts 125

34921A Replaceable Parts 126

34922A Replaceable Parts 126

34923A Replaceable Parts 127

34924A Replaceable Parts 127

34925A Replaceable Parts 127

34931A Replaceable Parts 128

34932A Replaceable Parts 129

34933A Replaceable Parts 130

34937A Replaceable Parts 130

34938A Replaceable Parts 130

34946A and 34947A Replaceable Parts 131

Vendor Addresses

131

7 Backdating

8 Diagrams

34921A Component Locator

136

34922A Component Locator

137

34923A Component Locator

138

34924A Component Locator

139

34925A Component Locator (Top) 140

34925A Component Locator (Bottom) 141

34931A Component Locator

142

34932A Component Locator

143

34933A Component Locator

144

34937A Component Locator

145

34938A Component Locator

146

34980A Service Guide

Agilent 34980A Multifunction Switch/Measure Unit

Service Guide

1

Obtaining Service

Operating Checklist 6

Types of Service Available 6

Repackaging for Shipment 7

Cleaning 7

Self Test Procedures 8

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

page 85 .

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

the table on page 85

.

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

Typical System Speeds 29

Internal DMM Measurement Characteristics 31

System Specifications and Characteristics 34

Product Dimensions 36

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]

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]

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

15V

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

Calibration Interval 44

Adjustment is Recommended 44

Time Required for Calibration 45

Automating Calibration Procedures 45

Recommended Test Equipment 46

Calibration Security 47

Calibration Message 48

Calibration Count 48

Calibration Process 49

Aborting a Calibration in Progress 49

Performance Verification Tests 50

Input Connections 52

DMM Test Considerations 53

Internal DMM Verification Tests 53

Optional AC Performance Verification Tests 59

Internal DMM Adjustments 60

Gain Adjustment 61

Plug-in Module Test Considerations 65

34951A 4-Ch Isolated DAC Module 66

34952A Multifunction Module 71

Relay Plug-in Modules 73

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

page 48

) 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

“Calibration

Security" on page 47).

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

“Plug- in Module Test

Considerations" on page 65.

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

Adjustments" on page 60).

Perform the DAC adjustment procedures if either the 34951A (

“34951A

4- Ch Isolated DAC Module" on page 66) or 34952A (

“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

34980A Service Guide

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

page 52

.

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

34980A Service Guide

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

page 52 ).

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.

[2] The 2-wire ohms resistance verification test is optional (see “Gain Adjustment Considerations" on page 61). For 2-wire ohms using a multiplexer for the input connections, an additional 4

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

page 52 ).

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.

Follow the steps outlined below. Review “DMM Test Considerations" on page 53 before beginning this test.

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

“Performance Verification

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

34980A Service Guide

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

“Gain Adjustment

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

(starting on page 55

).

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.

64 34980A Service Guide

34980A Service Guide

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

Connections" on page 52.

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

given beginning on page 70 .

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

page 48

) is not advanced.

If the instrument is unsecured for calibration, the adjustments are written to non- volatile calibration memory. The calibration count

(see

page 48

) 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

34980A Service Guide

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

page 66 .

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

Troubleshooting Hints 78

Power Supply 79

Product Firmware Updates 79

Instrument Errors 80

Error Numbers 82

Isolate a Problem with a Plug-In Module 90

Relay and FET Replacement 91

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

page 115

.

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

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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

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Troubleshooting and Diagnostics 4

For the 34921A, relay and fuse part numbers are given on page 126 and

the component locator is shown on

page 136

. 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

page 143

. 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

page 108

.

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

Surface Mount Repair 114

Tools Required 114

Basic Disassembly 115

Power Supply Removal 116

Power Supply Disassembly 117

KOM Removal 118

Front Panel Removal 119

Front Panel Disassembly 120

DMM Removal 121

Backplane Removal 122

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

page 114

.

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

page 116 ).

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

procedure on page 119 ).

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

page 121

).

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

34921A Replaceable Parts 126

34922A Replaceable Parts 126

34923A Replaceable Parts 127

34924A Replaceable Parts 127

34925A Replaceable Parts 127

34931A Replaceable Parts 128

34932A Replaceable Parts 129

34933A Replaceable Parts 130

34937A Replaceable Parts 130

34938A Replaceable Parts 130

34946A and 34947A Replaceable Parts 131

Vendor Addresses 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

page 115 .

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

page 137

.

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

page 138

.

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

page 139

.

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

page 140 .

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

page 142

.

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

page 143

.

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

page 144

.

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

page 145

.

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

34921A Component Locator 136

34922A Component Locator 137

34923A Component Locator 138

34924A Component Locator 139

34925A Component Locator (Top) 140

34925A Component Locator (Bottom) 141

34931A Component Locator 142

34932A Component Locator 143

34933A Component Locator 144

34937A Component Locator 145

34938A Component Locator 146

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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