Agilent Technologies 34980A Service Manual

Agilent TechnologiesAgilent 34980A Multifunction Switch/Measure UnitService Guide

ix 34980A Service GuideAdvancedAvailable at a later firmware release Alarm • Select one of four alarms to report alarm conditions on the displayed cha

88 34980A Service Guide4 Troubleshooting and DiagnosticsPlug-In Module ErrorsThese errors are related to the plug- in modules and often indicate a fai

Troubleshooting and Diagnostics 434980A Service Guide 89Error Description935936937940941942943944945946947948949950951952953954955956 "Trace of t

90 34980A Service Guide4 Troubleshooting and DiagnosticsIsolate a Problem with a Plug-In ModuleAny module that fails the mainframe self- test or gener

Troubleshooting and Diagnostics 434980A Service Guide 91Relay and FET ReplacementFailing relays and FET switches can be isolate to a specific channel

92 34980A Service Guide4 Troubleshooting and Diagnostics34921A 40-Channel Armature Multiplexer with Low Thermal OffsetThe 34921A 40- Channel Armature

Troubleshooting and Diagnostics 434980A Service Guide 93For the 34921A, relay and fuse part numbers are given on page 126 and the component locator is

94 34980A Service Guide4 Troubleshooting and Diagnostics34922A 70-Channel Armature MultiplexerThe high- density 34922A 70- Channel Armature Multiplexe

Troubleshooting and Diagnostics 434980A Service Guide 95Bank 1 Bank 2Channel Relay Channel Relay001 K601 036 K736002 K602 037 K737003 K603 038 K738004

96 34980A Service Guide4 Troubleshooting and Diagnostics34923A 40/80-Channel Reed MultiplexerThe 34923A 40/80- Channel Reed Multiplexer (40/80- Ch Ree

Troubleshooting and Diagnostics 434980A Service Guide 97For the 34923A, relay part numbers are given on page 127 and the component locator is shown on

34980A Service Guide xInstrument Rack MountingUsing the optional Agilent Y1130A Rack Mount Kit, you can mount the 34980A in a standard 19- inch rack c

98 34980A Service Guide4 Troubleshooting and Diagnostics34924A 70-Channel Reed MultiplexerThe high- density 34924A 70- Channel Reed Multiplexer (70-

Troubleshooting and Diagnostics 434980A Service Guide 99For the 34924A, relay part numbers are given on page 127 and the component locator is shown on

100 34980A Service Guide4 Troubleshooting and Diagnostics34925A 40/80-Channel Optically-Isolated FET MultiplexerThe 34925A 40/80- Channel Optically- I

Troubleshooting and Diagnostics 434980A Service Guide 101For the 34925A, FET part numbers are given on page 127 and the component locator is shown on

102 34980A Service Guide4 Troubleshooting and Diagnostics34931A Dual 4x8 Armature MatrixThe 34931A dual 4x8 armature matrix contains two matrices, eac

Troubleshooting and Diagnostics 434980A Service Guide 103For the 34931A, relay part numbers are given on page 128 and the component locator is shown o

104 34980A Service Guide4 Troubleshooting and Diagnostics34932A Dual 4x16 Armature MatrixThe 34932A dual 4x16 armature matrix contains two matrices, e

Troubleshooting and Diagnostics 434980A Service Guide 105For the 34932A, relay part numbers are given on page 129 and the component locator is shown o

106 34980A Service Guide4 Troubleshooting and Diagnostics.Matrix 1 Matrix 2Channel Relay Channel Relay301 K7301 701 K8701302 K7302 702 K8702303 K7303

Troubleshooting and Diagnostics 434980A Service Guide 10734933A Dual/Quad 4x8 Reed MatrixUsing program commands or the front panel of the 34980A, you

xi 34980A Service GuideAgilent 34980A Dimensions (shown with Reverse Rack Mount brackets installed)367.7 mm (14.48 in)101.9 mm (4.01 in) or70.4

108 34980A Service Guide4 Troubleshooting and Diagnostics34933A Two-Wire Mode NOTE:Matrix Relays: Reed non-latchingAnalog Bus Relays: Armature non-lat

Troubleshooting and Diagnostics 434980A Service Guide 10934933A One-Wire Mode For the 34933A, relay part numbers are given on page 130 and the compone

110 34980A Service Guide4 Troubleshooting and DiagnosticsMatrix 1 Matrix 22-Wire Channel1-Wire ChannelRelay 2-Wire Channel 1-Wire ChannelRelay101 111,

Troubleshooting and Diagnostics 434980A Service Guide 11134937A 32-Channel GP SwitchThe 34937A general- purpose switch module provides independent co

112 34980A Service Guide4 Troubleshooting and Diagnostics34938A 20-Channel High-Current GP SwitchThe 34938A high- current GP switch module provides tw

113Agilent 34980A Multifunction Switch/Measure UnitService GuideAgilent Technologies5Disassembly and RepairElectrostatic Discharge (ESD) Precautions

114 34980A Service Guide5 Disassembly and RepairElectrostatic Discharge (ESD) PrecautionsAlmost all electrical components can be damaged by electrosta

Disassembly and Repair 534980A Service Guide 115Basic DisassemblyObserve the electrostatic discharge precautions given on page 114.1 Remove the power

116 34980A Service Guide5 Disassembly and RepairPower Supply Removal1 Remove the two T20 Torx screws securing the power supply module.2 Swing the modu

Disassembly and Repair 534980A Service Guide 1173To completely remove the power supply, unplug the main power input (brown and blue) and the green/yel

34980A Service Guide 1ContentsFront Panel at a Glance iiiRear Panel at a Glance ivRear Panel Connector Pinouts vAnnunciator Display Ind

118 34980A Service Guide5 Disassembly and RepairKOM Removal1 Remove the power supply (see the procedure on page 116).2 Disconnect the two ribbon cable

Disassembly and Repair 534980A Service Guide 119Front Panel Removal1 Loosen the front panel assembly by lifting gently on the four plastic ears and mo

120 34980A Service Guide5 Disassembly and RepairFront Panel Disassembly1 Pull to remove the knob. Use a 7/16” nut driver to remove the nut from the kn

Disassembly and Repair 534980A Service Guide 121DMM Removal1 To remove the DMM (if installed), remove the front panel (see the procedure on page 119).

122 34980A Service Guide5 Disassembly and RepairBackplane Removal1 Remove the front panel (see the procedure on page 119) and the DMM (see the procedu

123Agilent 34980A Multifunction Switch/Measure UnitService GuideAgilent Technologies6Replaceable PartsTo Order Replaceable Parts 124Backdating and

124 34980A Service Guide6 Replaceable PartsReplaceable PartsThis section contains information for ordering replacement parts for your instrument. Part

Replaceable Parts 634980A Service Guide 125Mainframe Replaceable PartsRefer to the disassembly drawings beginning on page 115.Agilent Part Number Desc

126 34980A Service Guide6 Replaceable Parts34921A Replaceable PartsA component locator is shown on page 136.34922A Replaceable PartsA component locato

Replaceable Parts 634980A Service Guide 12734923A Replaceable PartsA component locator is shown on page 138.34924A Replaceable PartsA component locato

2 34980A Service Guide3 Calibration ProceduresAgilent Technologies Calibration Services 44Calibration Interval 44Adjustment is Recommended

128 34980A Service Guide6 Replaceable Parts34931A Replaceable PartsA component locator is shown on page 142.Component Locator Agilent P/N Description

Replaceable Parts 634980A Service Guide 12934932A Replaceable PartsA component locator is shown on page 143.Component Locator Agilent P/N Description

130 34980A Service Guide6 Replaceable Parts34933A Replaceable PartsA component locator is shown on page 144.34937A Replaceable PartsA component locato

Replaceable Parts 634980A Service Guide 13134946A and 34947A Replaceable PartsThere are no replaceable parts on these modules. However, they support o

132 34980A Service Guide6 Replaceable Parts

133Agilent 34980A Multifunction Switch/Measure UnitService GuideAgilent Technologies7Backdating

134 34980A Service Guide7 BackdatingBackdatingThis chapter contains information necessary to adapt this manual to instruments and assemblies not direc

135Agilent 34980A Multifunction Switch/Measure UnitService GuideAgilent Technologies8Diagrams34921A Component Locator 13634922A Component Locator

K601K606K611K602K616K607K603K612K617K608 K604K613K618K609K614K610K619K605K615K620K721K726K731K722K736K727K734K730K739K725K735K740K723K732K737K728K724K

Diagrams 834980A Service Guide 13734922A Component LocatorK814K813K812K821K824K823K822K811K608K618K627K612K602K633K622K617K623K603K634K628K635K609K619

34980A Service Guide 34 Troubleshooting and DiagnosticsTroubleshooting Hints 78Power Supply 79Product Firmware Updates 79Instrument Error

138 34980A Service Guide8 Diagrams34923A Component LocatorK621K611K503K623K613K612K622K614K624K609K402K403K404K502K504K505K501K405K401

Diagrams 834980A Service Guide 13934924A Component LocatorK402K401K405K404K408K407K502K501K505K504K508K507K403K406K409K509K506K503K614K624K612K622K623

140 34980A Service Guide8 Diagrams34925A Component Locator (Top)K802U606U616U613U618U620U706U703U713U718U720U601 U603U612U614U619U701U707 U712 U714U71

Diagrams 834980A Service Guide 14134925A Component Locator (Bottom)U615U605 U608 U617U602U610U609U604U607 U611U715U705U708 U717 U702U710U709U704 U716

142 34980A Service Guide8 Diagrams34931A Component LocatorK924K7308K923K922K921K7408K7208K7108K7307 K7407K7207 K7107K7306K7406 K7206 K7106K7305K7405K7

Diagrams 834980A Service Guide 14334932A Component LocatorK7308K7408K7208K7108K7307 K7407K7207 K7107K7306K7406 K7206 K7106K7305K7405K7205 K7105K7304K7

144 34980A Service Guide8 Diagrams34933A Component LocatorK608K702K704K701K703K508K601K602K603K604K605K501K502K503K504K505K606K607K506K507

Diagrams 834980A Service Guide 14534937A Component LocatorK617K614K603K612 K602K626K630K631K629K628K616K632K620K624K619K623K627K615K618K622K621K625K60

146 34980A Service Guide8 Diagrams34938A Component LocatorK505K502K508K509K503K518K519K512K513K504K507K506K501K510K511K516K517K514K515K520

4 34980A Service Guide6 Replaceable PartsTo Order Replaceable Parts 124Backdating and Part Changes 124Mainframe Replaceable Parts 12534

5Agilent 34980A Multifunction Switch/Measure UnitService GuideAgilent Technologies1Obtaining ServiceOperating Checklist 6Types of Service Available

6 34980A Service Guide1 Obtaining ServiceObtaining ServiceOperating ChecklistBefore returning your instrument to Agilent for service or repair check t

Obtaining Service 134980A Service Guide 7Obtaining Repair Service (Worldwide)To obtain service for your instrument (in- warranty, under service contra

Notices© Agilent Technologies, Inc. 2006, 2011, 2012, 2013No part of this manual may be reproduced in any form or by any means (including electronic s

8 34980A Service Guide1 Obtaining ServiceSelf Test ProceduresPower–On Self–TestEach time the instrument is powered on, a subset of self–tests are perf

Obtaining Service 134980A Service Guide 9Electrostatic Discharge (ESD) PrecautionsAlmost all electrical components can be damaged by electrostatic dis

10 34980A Service Guide1 Obtaining Service

11Agilent 34980A Multifunction Switch/Measure UnitService GuideAgilent Technologies2SpecificationsMultiplexer Module Specifications and Characteristic

12 34980A Service Guide2 SpecificationsMultiplexer Module Specifications and Characteristics [1] DC or AC RMS voltage, channel-to-channel or channel-t

Specifications 234980A Service Guide 13Multiplexer Module Specifications and Characteristics (continued)[1] 50  source, 50  load, differential measu

14 34980A Service Guide2 SpecificationsMatrix Modules Specifications and Characteristics[1] DC or AC RMS voltage, channel-to-channel or channel-to-ear

Specifications 234980A Service Guide 15Matrix Modules Specifications and Characteristics (continued)[1] 50 source, 50 load, differential measureme

16 34980A Service Guide2 SpecificationsGP Actuator Module Specifications and Characteristics[1] DC or AC RMS voltage, channel-to-channel or channel-to

Specifications 234980A Service Guide 17RF and Microwave Module Specifications and Characteristics [1] 50  source, 50  load (75  for 34942A)[2] For

Additional Safety NoticesThe following general safety precautions must be observed during all phases of operation of this instrument. Failure to compl

18 34980A Service Guide2 SpecificationsRF and Microwave Module Specifications and Characteristics (continued)[1] Channel-to-earth[2] For more detailed

Specifications 234980A Service Guide 1934945A/34945EXT Module Specifications and Characteristics34945EXT switch drive (64 channels, low side drive mod

20 34980A Service Guide2 SpecificationsVREFOEDOUTDINENZo = 102.5 pFVTHREF+5V+-1M14.7 26.110KVcc+5V+5.1VI/O1 of 64Rpullup34950A 64-channel Digital I/O

Specifications 234980A Service Guide 2134950A 64-channel Digital I/O Specifications and Characteristics (continued)[1] Configurable by bank[2] Lower c

22 34980A Service Guide2 Specifications34951A 4-channel D/A Converter Specifications and CharacteristicsGeneral specificationsMaximum update rate 200

Specifications 234980A Service Guide 2334951A 4-channel D/A Converter Specifications and Characteristics (continued)Phase-locking I/O trigger characte

24 34980A Service Guide2 Specifications34952A Multifunction Module Specifications and CharacteristicsDigital input/output characteristicsFour 8-bits c

Specifications 234980A Service Guide 2534959A Breadboard Module Specifications and CharacteristicsGeneral specificationsMaximum module power dissipati

26 34980A Service Guide2 SpecificationsInternal DMM Specifications and CharacteristicsDC and Resistance SpecificationsDMM accuracy ± (% of reading + %

Specifications 234980A Service Guide 27AC Specifications ±(% of reading + % of range)DMM accuracy ± (% of reading + % of range). Includes measurement

iii

28 34980A Service Guide2 SpecificationsAdditional Low Frequency Error for ACV, ACI (% of reading)Additional Error for Frequency, Period (% of reading)

Specifications 234980A Service Guide 29Typical System SpeedsMeasurements made on a 3.2 GHz PC running VB6 in Windows XP Professional. [1] Readings we

30 34980A Service Guide2 SpecificationsSingle Channel Measurement Rates — DMM Reading Rates [1, 2][1] Reading speeds for 60 Hz; autozero OFF[2] For fi

Specifications 234980A Service Guide 31Data Out of Memory to LAN, USB, or GPIBData transfer rate with 1000 channel blocks.[1] LAN large block throughp

32 34980A Service Guide2 SpecificationsInternal DMM Measurement Characteristics (continued)[1] For 1 k unbalance in LO lead[2] For power line freque

Specifications 234980A Service Guide 33Internal DMM Measurement Characteristics (continued)[1] Reading speeds for 60 Hz and (50 Hz) operation; autozer

34 34980A Service Guide2 SpecificationsSystem Specifications and CharacteristicsScanning inputsAnalog 34921A, 34922A, 34923A, 34924A, and 34925A multi

Specifications 234980A Service Guide 35System Specifications and Characteristics (continued)[1] Storage at temperatures above 40°C will decrease batte

36 34980A Service Guide2 SpecificationsProduct Dimensions425.6 mm (16.76 in)367.7 mm (14.48 in)74.26 mm(2.92 in)5.5 mm (0.22 in) SQM3.5 x 0.6 Thread4

Specifications 234980A Service Guide 37To Calculate Total DMM Measurement ErrorEach specification includes correction factors which account for errors

34980A Service Guide ivFront Panel at a Glance 1On/Standby switch WARNINGs .. This switch is standby only. To disconnect the mains from the instrument

38 34980A Service Guide2 SpecificationsUnderstanding the “% of range“ Error The range error compensates for inaccuracies that result from the functi

Specifications 234980A Service Guide 39Interpreting Internal DMM SpecificationsThis section is provided to give you a better understanding of the term

40 34980A Service Guide2 SpecificationsAccuracy Accuracy is a measure of the “exactness” to which the internal DMM’s measurement uncertainty can be d

Specifications 234980A Service Guide 41Configuring for Highest Accuracy MeasurementsThe measurement configurations shown below assume that the interna

42 34980A Service Guide2 Specifications

43Agilent 34980A Multifunction Switch/Measure UnitService GuideAgilent Technologies3Calibration ProceduresAgilent Technologies Calibration Service

44 34980A Service Guide3 Calibration ProceduresCalibration Procedures This manual contains procedures for verification of the instrument’s performance

Calibration Procedures 334980A Service Guide 45Time Required for Calibration The 34980A can be automatically calibrated under computer control. With

46 34980A Service Guide3 Calibration ProceduresRecommended Test Equipment The test equipment recommended for the performance verification and adjustme

Calibration Procedures 334980A Service Guide 47Calibration Security This feature allows you to enter a security code to prevent accidental or unauthor

v 34980A Service GuideRear Panel at a Glance1Access to Analog Buses (shown with cover installed). For pinout, see page vi.2Module installed in slot 13

48 34980A Service Guide3 Calibration ProceduresCalibration MessageThe instrument allows you to store a message in calibration memory. You may store a

Calibration Procedures 334980A Service Guide 49Calibration Process The following general procedure is the recommended method to complete a full instru

50 34980A Service Guide3 Calibration ProceduresPerformance Verification Tests Use the Performance verification Tests to verify the measurement perform

Calibration Procedures 334980A Service Guide 51Quick Performance Check The quick performance check is a combination of internal self- test and an abbr

52 34980A Service Guide3 Calibration ProceduresInternal DMMInput ConnectionsTest connections to the internal DMM are best accomplished using the rear

Calibration Procedures 334980A Service Guide 53DMM Test Considerations Errors may be induced by ac signals present on the input leads during a self- t

54 34980A Service Guide3 Calibration ProceduresInternal DMM Verification Tests Zero Offset Verification This procedure is used to check the zero offse

Calibration Procedures 334980A Service Guide 55Zero Offset Verification Procedure 1 Make sure you have read “DMM Test Considerations" on page 53

56 34980A Service Guide3 Calibration ProceduresGain Verification This procedure is used to check the “full scale” reading accuracy of the internal DMM

Calibration Procedures 334980A Service Guide 57AC VOLTS Gain Verification Test Configuration: AC Volts CONFigure[:VOLTage]:AC LF 3 HZ:SLOW[SENSe:

34980A Service Guide viRear Panel Connector PinoutsExternal Trigger/Alarms Connector (Male D-Sub)Analog Bus Connector (Female D-Sub)Ext Trig Input /Ch

58 34980A Service Guide3 Calibration Procedures AC CURRENT Gain Verification Test Configuration: AC Current CONFigure:CURRent:AC LF 3 HZ:SLOW[SENS

Calibration Procedures 334980A Service Guide 59Frequency Gain Verification Test Configuration: Frequency6½ digits[SENSe:]FREQuency:APERture 11Make

60 34980A Service Guide3 Calibration ProceduresOptional AC Performance Verification Tests These tests are not intended to be performed with every cali

Calibration Procedures 334980A Service Guide 61Internal DMM AdjustmentsYou will need a test input fixture to adjust the internal DMM (see page 52).Z

62 34980A Service Guide3 Calibration ProceduresGain Adjustment The Internal DMM stores a single new gain correction constant each time this procedure

Calibration Procedures 334980A Service Guide 63Valid Gain Adjustment Input Values Gain adjustment can be accomplished using the following input value

64 34980A Service Guide3 Calibration ProceduresGain Adjustment Procedure Adjustment for each function should be performed only in the order shown in

Calibration Procedures 334980A Service Guide 65–10 Vdc Adjustment Procedure (Optional)The –10 Vdc calibration electronically enhances the Internal DMM

66 34980A Service Guide3 Calibration ProceduresPlug-in Modules Plug-in Module Test Considerations For optimum performance, all test procedures should

Calibration Procedures 334980A Service Guide 6734951A 4-Ch Isolated DAC ModuleEach isolated DAC output channel can be measured and adjusted using the

vii 34980A Service GuideAnnunciator Display IndicatorsDisplay Indicator DefinitionLAN Communicating with the 34980A over LAN.USB Communicating with th

68 34980A Service Guide3 Calibration Procedures34951A VerificationTest Connections The DAC outputs can be measured using an external voltmeter, or us

Calibration Procedures 334980A Service Guide 69Analog Output Verification Test This procedure is used to check the calibration of the analog outputs

70 34980A Service Guide3 Calibration Procedures.[1] Apply a measured “0” offset to this measurement.Output Voltage Quick Check Error from Nominal (90

Calibration Procedures 334980A Service Guide 71Analog Output AdjustmentInstall the 34951A module in the mainframe and allow a 1 hour warm- up before p

72 34980A Service Guide3 Calibration Procedures34952A Multifunction ModuleThe only calibration constants are for the two DAC outputs on the 34952A Mul

Calibration Procedures 334980A Service Guide 73Analog Output AdjustmentInstall the 34952A module in the mainframe and allow a 1 hour warm- up before

74 34980A Service Guide3 Calibration ProceduresRelay Plug-in ModulesThere are two methods you can use to verify relays: • Read the relay cycle count.

Calibration Procedures 334980A Service Guide 75Use the DIAGnostic:RELay:CYCLes? (@<ch_list>) command to read relay cycle counts on the following

76 34980A Service Guide3 Calibration ProceduresThermocouple Reference Junction 34921A (Optional) To make a thermocouple measurement a known reference

77Agilent 34980A Multifunction Switch/Measure UnitService GuideAgilent Technologies4Troubleshooting and DiagnosticsTroubleshooting Hints 78Power Su

34980A Service Guide viiiFront Panel Menu ReferenceThis section gives an overview of the top two levels of menus that you access from the front panel.

78 34980A Service Guide4 Troubleshooting and DiagnosticsTroubleshooting and DiagnosticsThis chapter provides basic instructions to isolate a problem.T

Troubleshooting and Diagnostics 434980A Service Guide 79Power SupplyThe main power supply provides +12 Volts. All other power supplies are derived fro

80 34980A Service Guide4 Troubleshooting and DiagnosticsInstrument ErrorsA record of up to 20 errors can be stored in the instrument's error queu

Troubleshooting and Diagnostics 434980A Service Guide 81Front-Panel OperationIf the ERROR annunciator is on, press [View] to view the errors. Use the

82 34980A Service Guide4 Troubleshooting and DiagnosticsError NumbersThe following sections list the error numbers and error descriptions that may be

Troubleshooting and Diagnostics 434980A Service Guide 83Instrument ErrorsThese errors typically do not indicate a hardware failure. They are related t

84 34980A Service Guide4 Troubleshooting and DiagnosticsError Description301 "Module currently committed to scan"302 "No module was d

Troubleshooting and Diagnostics 434980A Service Guide 85Self-Test Errors These errors can indicate a hardware failure. The first two errors, 601 and 6

86 34980A Service Guide4 Troubleshooting and DiagnosticsCalibration ErrorsThe following errors indicate failures that may occur during a calibration.

Troubleshooting and Diagnostics 434980A Service Guide 87Firmware Update ErrorsThese errors occur when attempting to update the mainframe, internal DMM