Keysight Technologies 34980A Service Manual
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Keysight Technologies 34980A Service Manual

Data acquisition system
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Keysight 34980A Data
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Service Guide

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Summary of Contents for Keysight Technologies 34980A

  • Page 1 Keysight 34980A Data Acquisition System Service Guide...

  • Page 2: Safety Information

    EXPRESS OR IMPLIED, WITH REGARD agreement and written consent from customarily provided to the public. TO THIS MANUAL AND ANY Keysight Technologies as governed by Accordingly, Keysight provides the INFORMATION CONTAINED HEREIN, United States and international Software to U.S. government INCLUDING BUT NOT LIMITED TO THE copyright laws.

  • Page 3: Safety Symbols

    Before Applying Power Verify that all safety precautions are taken. Make all connections to the unit before applying power. Keysight 34980A Service Guide...

  • Page 4: Before Applying Power

    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. Keysight 34980A Service Guide...

  • Page 5: Environmental Conditions

    Environmental Conditions Keysight 34980A is designed for indoor use in an installation category II and low condensation environment. Do not use in locations where conductive dust or electrolytic salt dust may be present. Table below shows the general environmental conditions for this instrument. Refer to the product data sheet at https://literature.cdn.keysight.com/litweb/pdf/5989-1437EN.pdf...

  • Page 6: Waste Electrical And Electronic Equipment (Weee) Directive 2002/96/Ec

    To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/34980a (product-specific information and support, software and documentation updates) – www.keysight.com/find/assist (worldwide contact information for repair and service) Keysight 34980A Service Guide...

  • Page 7: Front Panel At A Glance

    This switch is standby only. To disconnect the mains from WARNING the instrument, remove the power cord. Utility menu contains settings for Remote I/O (LAN, GPIB, and USB), Date and Time, and other system-related instrument parameters Keysight 34980A Service Guide...
  • Page 8 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. Keysight 34980A Service Guide...

  • Page 9: Rear Panel At A Glance

    Rear Panel at a Glance Access to Analog Buses (shown with cover installed). For pinout, see page Module installed in slot 1 Slot identifier Keysight 34980A Service Guide...
  • Page 10 LAN connector (10Base T/100Base Tx) USB 2.0 connector External trigger input. For pinout, see page Internal DMM option mark. If you ordered the internal DMM option, the circle is marked black. IEEE 488.2 GPIB Connector Chassis ground screw Keysight 34980A Service Guide...

  • Page 11: Rear Panel Connector Pinouts

    3.3 V Chan Closed Output / VM Comp Output (Pin 5) Approx. 2 μs Alarm 1 Output (Pin 1) Alarm 2 Output (Pin 2) Alarm 3 Output (Pin 3) Alarm 4 Output (Pin 4) Gnd (Pin 9) Keysight 34980A Service Guide...

  • Page 12: Annunciator Display Indicators

    (Pin 5) ABus1 HI (Pin 9) ABus1 LO (Pin 4) ABus2 HI (Pin 8) ABus2 LO (Pin 3) ABus3 HI (Pin 7) ABus3 LO (Pin 2) ABus4 HI (Pin 6) ABus4 LO (Pin 1) Annunciator Display Indicators Keysight 34980A Service Guide...

  • Page 13: Analog Bus Connector (Female D-Sub)

    Pressing the LOCAL button takes you out of “remote” mode and enables the front panel keys. Safety Interlock ABus Safety Interlock. Terminal block or cables have been removed from the D-sub connector of a module. For more information, see the Keysight 34980A User’s Guide. Trig Waiting for external or manual trigger during scans.

  • Page 14: Front Panel Menu Reference

    – 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 Keysight 34980A Service Guide...
  • Page 15 – 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 Keysight 34980A Service Guide...

  • Page 16: Instrument Rack Mounting

    Instrument Rack Mounting Using the optional Keysight 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.
  • Page 17 425.6 mm (16.76 in) 367.7 mm (14.48 in) 101.9 mm (4.01 in) 70.4 mm (2.78 in) Keysight 34980A Dimensions (shown with Reverse Rack Mount brackets installed) Keysight 34980A Service Guide...
  • Page 18 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 19: Table Of Contents

    ........26 Electrostatic Discharge (ESD) Precautions ....27 Keysight 34980A Service Guide...
  • Page 20 Product Firmware Updates ....... . 69 Keysight 34980A Service Guide...
  • Page 21 ......126 Mainframe Replaceable Parts ......127 Keysight 34980A Service Guide...
  • Page 22 34938A Component Locator ....... . 148 Keysight 34980A Service Guide...
  • Page 23 Keysight 34980A Data Acquisition System Service Guide Obtaining Service Obtaining Service...

  • Page 24: Obtaining Service

    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, Keysight Technologies will repair or replace it under the terms of your warranty. After your warranty expires, Keysight offers repair services at competitive prices.

  • Page 25: Repackaging For Shipment

    Or use our Web link for information on contacting Keysight worldwide: www.Keysight.com/find/assist Or contact your Keysight Technologies Representative. Before shipping your instrument, ask the Keysight Technologies Service Center to provide shipping instructions, including what components to ship. Keysight recommends that you retain the original shipping carton for use in such shipments.

  • Page 26: Cleaning

    – 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 Keysight for service. Keysight 34980A Service Guide...

  • Page 27: Electrostatic Discharge (Esd) Precautions

    – 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. Keysight 34980A Service Guide...
  • Page 28 Obtaining Service THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 29: Specifications

    Keysight 34980A Data Acquisition System Service Guide Specifications For the characteristics and specifications of the 34980A Data Acquisition System, refer to the datasheet at https://literature.cdn.keysight.com/litweb/pdf/5989-1437EN.pdf.
  • Page 30 Specifications THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 31: Calibration Procedures

    Keysight 34980A Data Acquisition System Service Guide Calibration Procedures Calibration Procedures Internal DMM Plug-in Modules...

  • Page 32: Keysight Technologies Calibration Services

    Whatever calibration interval you select, Keysight 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.

  • Page 33: Time Required For Calibration

    36) to verify that all adjustments have been performed. 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”...

  • Page 34: Recommended Test Equipment

    J Type Calibrated Reference Junction ± 0.1 × °C Thermocouple Triple Point Cell 34921A with 34921T Only Relay contact resistance Keysight Y1131A ± 0.001Ω resolution All switch modules [1] Optional test if not using relay cycle count. Keysight 34980A Service Guide...

  • Page 35: Calibration Security

    “34951A 4-Ch Isolated DAC Module” on page 56. 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.

  • Page 36: Calibration Message

    – 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} Keysight 34980A Service Guide...

  • Page 37: Calibration Process

    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 Keysight 34980A Service Guide...

  • Page 38: Performance Verification Tests

    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. Keysight 34980A Service Guide...
  • Page 39 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. Keysight 34980A Service Guide...

  • Page 40: Internal Dmm

    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? Keysight 34980A Service Guide...
  • Page 41 ABus connector are shown below. Use shielded twisted pair PTFE insulated cables to reduce settling and NOTE noise errors. Connect the shield to the source LO output. PTFE is a registered trademark of E.I. du Pont de Nemours and Company. Keysight 34980A Service Guide...

  • Page 42: Dmm Test Considerations

    “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.

  • Page 43: Internal Dmm Verification Tests

    DC Volts 10 V ± 40 µV ± 50 µV ± 50 µV Short 100 V ± 600 µV ± 600 µV ± 600 µV Short 300 V ± 6 mV ± 9 mV ± 9 mV Keysight 34980A Service Guide...
  • Page 44 3 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.) Keysight 34980A Service Guide...
  • Page 45 4 Ω 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.
  • Page 46 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. Keysight 34980A Service Guide...
  • Page 47 100 mA 10 mA 1 kHz ± 1.41 mA ± 1.41 mA ± 1.41 mA 1 kHz ± 1.4 mA ± 1.4 mA ± 1.4 mA [1] Verify only, no adjustment. Q: Quick performance verification test points. Keysight 34980A Service Guide...
  • Page 48 ± 0.1 Hz 10 mV 100 kHz ± 6 Hz ± 10 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. Keysight 34980A Service Guide...

  • Page 49: Optional Ac Performance Verification Tests

    ± 7 mV ± 9 mV ± 10 mV 1 kHz 10 V ± 3.4 mV ± 4.5 mV ± 4.6 mV 100 mV 1 kHz 10 V ± 13 mV ± 14 mV ± 14 mV Keysight 34980A Service Guide...

  • Page 50: Internal Dmm Adjustments

    2 Set the DC VOLTS function. 3 Send the value 0.000000 to the instrument using the CALibration:VALue 0.000000 command. 4 Calibrate the instrument using the CALibration? command. 5 Perform the “Zero Offset Verification” on page 43 to check zero calibration results. Keysight 34980A Service Guide...

  • Page 51: Gain Adjustment

    Perform the dc voltage gain calibration before the ac voltage gain calibration. Never turn off the instrument during a Gain Adjustment. This may cause NOTE calibration memory for the present function to be lost. Keysight 34980A Service Guide...
  • Page 52 1 kHz –100 kHz [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. Keysight 34980A Service Guide...
  • Page 53 5 Perform the appropriate Gain Verification Test to check the calibration results. 6 Repeat steps 1 through 5 for each gain verification test point shown in the tables. Each range in the gain adjustment procedure takes less than 20 seconds to NOTE complete. Keysight 34980A Service Guide...
  • Page 54 (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. Keysight 34980A Service Guide...

  • Page 55: Plug-In Modules

    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. Keysight 34980A Service Guide...

  • Page 56: 34951A 4-Ch Isolated Dac Module

    When this type of adjustment is made, the calibration count (see page 36) is not advanced. – If the instrument is unsecured for calibration, the adjustments are written to non-volatile calibration memory. The calibration count (see page 36) is advanced. Keysight 34980A Service Guide...
  • Page 57 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. Keysight 34980A Service Guide...
  • Page 58 When measuring the 0 mA output value, apply the offset value from step 1 to the measured value. 6 Repeat steps 2 through 5 for channels 2, 3 and 4. 7 Remove the input test connector. Keysight 34980A Service Guide...
  • Page 59 ± 9.5 μA ± 5 μA 0 mA -5 mA ± 9.5 μA -10 mA ± 14 μA -15 mA ± 18.5 μA -20 mA ± 23 μA [1] Apply a measured “0” offset to this measurement. Keysight 34980A Service Guide...
  • Page 60 4 The command returns a value of “+0” if the calibration is successful. A returned value of “+1” indicates a calibration failure. Following the auto-calibration procedure, the DMM is left in its reset state NOTE (DCV). Keysight 34980A Service Guide...

  • Page 61: 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. Keysight 34980A Service Guide...
  • Page 62 It is not necessary to test the voltage output at the full rated 10 mA load. NOTE Output Vol tage Quick Check Error from Nominal (1 year) 10 V ± 45 mV ± 20 mV -10 V ± 45 mV Keysight 34980A Service Guide...
  • Page 63 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. 5 Repeat steps 3 and 4 for channel 7. Keysight 34980A Service Guide...

  • Page 64: Relay Plug-In Modules

    “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. Keysight 34980A Service Guide...
  • Page 65 The Keysight Y1131A Verification/Diagnostic Software Kit contains software and hardware used to test the relay switching modules available for the Keysight 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.

  • Page 66: Thermocouple Reference Junction 34921A (Optional)

    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) 6 Subtract the thermocouple error from the measured temperature. Verify the result is within ± 1.0 °C of the known temperature (set in step 4). Keysight 34980A Service Guide...
  • Page 67 Keysight 34980A Data Acquisition System Service Guide Troubleshooting and Diagnostics Troubleshooting and Diagnostics...

  • Page 68: Troubleshooting And Diagnostics

    2 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. Keysight 34980A Service Guide...

  • Page 69: Power Supply

    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 Keysight 34980A product page at www.Keysight.com/find/34980AUpdates. Front Panel Operation: Utility >...

  • Page 70: Instrument Errors

    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 Keysight 34980A, see Status System Introduction.

  • Page 71: Error Numbers

    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. Keysight 34980A Service Guide...
  • Page 72 -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" Keysight 34980A Service Guide...
  • Page 73 "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" Keysight 34980A Service Guide...
  • Page 74 "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" Keysight 34980A Service Guide...
  • Page 75 "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" Keysight 34980A Service Guide...

  • Page 76: Calibration Errors

    "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" Keysight 34980A Service Guide...
  • Page 77 "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" Keysight 34980A Service Guide...
  • Page 78 These errors are related to the plug-in modules and often indicate a failing module. Error Description "Module hardware: unexpected data received" "Module hardware: missing stop bit" "Module hardware: data overrun" "Module hardware: protocol violation" "Module hardware: early end of data" "Module hardware: missing end of data" Keysight 34980A Service Guide...
  • Page 79 "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" Keysight 34980A Service Guide...
  • Page 80 "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" Keysight 34980A Service Guide...

  • Page 81: Isolate A Problem With A Plug-In Module

    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 replacement 34959A Breadboard module Module replacement Keysight 34980A Service Guide...

  • Page 82: Relay And Fet Replacement

    The Keysight Y1131A Verification/Diagnostic Software Kit is a recommended tool and contains software and hardware used to test the relay switching modules available for the Keysight 34980A Multifunction Switch/Measure Unit. The software provides module–specific tests to assist you with troubleshooting possible relay failures and predicting system maintenance requirements.

  • Page 83: 34921A 40-Channel Armature Multiplexer With Low Thermal Offset

    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. Keysight 34980A Service Guide...
  • Page 84 K603 K723 K604 K724 K605 K725 K606 K726 K607 K727 K608 K728 K609 K729 K610 K730 K611 K731 K612 K732 K613 K733 K614 K734 K615 K735 K616 K736 K617 K737 K618 K738 K619 K739 K620 K740 Keysight 34980A Service Guide...

  • Page 85: 34922A 70-Channel Armature Multiplexer

    (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. Keysight 34980A Service Guide...
  • Page 86 Troubleshooting and Diagnostics For the 34922A, relay part numbers are given on page 128 and the component locator is shown on page 139. The table on the next page shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 87 K608 K743 K609 K744 K610 K745 K611 K746 K612 K747 K613 K748 K614 K749 K615 K750 K616 K751 K617 K752 K618 K753 K619 K754 K620 K755 K621 K756 K622 K757 K623 K758 K624 K759 K625 K760 Keysight 34980A Service Guide...

  • Page 88: 34923A 40/80-Channel Reed Multiplexer

    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. Keysight 34980A Service Guide...
  • Page 89 Troubleshooting and Diagnostics For the 34923A, relay part numbers are given on page 129 and the component locator is shown on page 140. The table below shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 90 031, 032 K402 071, 072 K502 033, 034 K403 073, 074 K503 035, 036 K404 075, 076 K504 037, 038 K405 077, 078 K505 039, 040 K405 079, 080 K505 Backplane Backplane K611 K621 K612 K622 Keysight 34980A Service Guide...

  • Page 91: 34924A 70-Channel Reed Multiplexer

    (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. Keysight 34980A Service Guide...
  • Page 92 Troubleshooting and Diagnostics For the 34924A, relay part numbers are given on page 129 and the component locator is shown on page 141. The table below shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 93 K404 K504 K409 K509 K407 K507 K401 K501 K404 K505 K404 K504 K408 K508 K408 K508 K402 K502 K403 K503 K404 K505 K409 K509 K407 K507 K401 K501 K403 K503 K404 K504 K409 K509 K407 K507 Keysight 34980A Service Guide...

  • Page 94: 34925A 40/80-Channel Optically-Isolated Fet Multiplexer

    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. Keysight 34980A Service Guide...
  • Page 95 Troubleshooting and Diagnostics Keysight 34980A Service Guide...
  • Page 96 029, 030 U615 069, 070 U715 031, 032 U616 071, 072 U716 033, 034 U617 073, 074 U717 035, 036 U618 075, 076 U718 037, 038 U619 077, 078 U719 039, 040 U620 079, 080 U720 Keysight 34980A Service Guide...

  • Page 97: 34931A Dual 4X8 Armature Matrix

    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. Keysight 34980A Service Guide...
  • Page 98 Matrix Relays: Armature latching. Analog Bus Relays: Armature non-latching. For the 34931A, relay part numbers are given on page 130 and the component locator is shown on page 144. The table below shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 99 K7108 K8508 K7201 K8601 K7202 K8602 K7203 K8603 K7204 K8604 K7205 K8605 K7206 K8606 K7207 K8607 K7208 K8608 K7301 K8701 K7302 K8702 K7303 K8703 K7304 K8704 K7305 K8705 K7306 K8706 K7307 K8707 K7308 K8708 K7401 K8801 Keysight 34980A Service Guide...

  • Page 100: 34932A Dual 4X16 Armature Matrix

    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. Keysight 34980A Service Guide...
  • Page 101 For the 34932A, relay part numbers are given on page 131 and the component locator is shown on page 145. The table below and on the next page shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 102 K7109 K8509 K7110 K8510 K7111 K8511 K7112 K8512 K7113 K8513 K7114 K8514 K7115 K8515 K7116 K8516 K7201 K8601 K7202 K8602 K7203 K8603 K7204 K8604 K7205 K8605 K7206 K8606 K7207 K8607 K7208 K8608 K7209 K8609 K7210 K8610 Keysight 34980A Service Guide...
  • Page 103 K7304 K8704 K7305 K8705 K7306 K8706 K7307 K8707 K7308 K8708 K7309 K8709 K7310 K8710 K7311 K8711 K7312 K8712 K7313 K8713 K7314 K8714 K7315 K8715 K7316 K8716 K7401 K8801 K7402 K8802 K7403 K8803 K7404 K8804 K7405 K8805 Keysight 34980A Service Guide...
  • Page 104 Troubleshooting and Diagnostics Matrix 1 Matrix 2 K7406 K8806 K7407 K8807 K7408 K8808 K7409 K8809 K7410 K8810 K7411 K8811 K7412 K8812 K7413 K8813 K7414 K8814 K7415 K8815 K7416 K8816 Backplane K921 K922 K923 K924 Keysight 34980A Service Guide...

  • Page 105: 34933A Dual/Quad 4X8 Reed Matrix

    Troubleshooting and Diagnostics 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 Ω in-rush resistors that are used to protect the reed relays from reactive loads.
  • Page 106 NOTE: All series resistors shown are 100Ω. 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). Keysight 34980A Service Guide...
  • Page 107 34933A One-Wire Mode For the 34933A, relay part numbers are given on page 131 and the component locator is shown on page 146. The table on the next page shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 108 134, 234 K506 334, 434 K606 135, 235 K504 335, 435 K604 136, 236 K503 336, 436 K603 137, 237 K502 337, 437 K602 138, 238 K501 338, 438 K601 141, 241 K505 341, 441 K605 Keysight 34980A Service Guide...

  • Page 109: 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. Keysight 34980A Service Guide...
  • Page 110 Channel Relay K601 K615 K602 K616 K603 K617 K604 K618 K605 K619 K606 K620 K607 K621 K608 K622 K609 K623 K610 K624 K611 K625 K612 K626 K613 K627 Form A Form A K629 K631 K630 K632 Keysight 34980A Service Guide...

  • Page 111: 34938A 20-Channel High-Current Gp Switch

    148. The table below shows the relationship of channel numbers to relay numbers. Bank 1 Bank 2 Channel Relay Channel Relay K501 K511 K502 K512 K503 K513 K504 K514 K505 K515 K506 K516 K507 K517 K508 K518 K509 K519 K510 K520 Keysight 34980A Service Guide...
  • Page 112 Troubleshooting and Diagnostics THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...
  • Page 113 Keysight 34980A Data Acquisition System Service Guide Disassembly and Repair Electrostatic Discharge (ESD) Precautions Surface Mount Repair Tools Required Basic Disassembly Power Supply Removal Power Supply Disassembly KOM Removal Front Panel Removal Front Panel Disassembly DMM Removal Backplane Removal...

  • Page 114: Disassembly And Repair

    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) Keysight 34980A Service Guide...

  • Page 115: Basic Disassembly

    2 Remove all plug-in modules. 3 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. Keysight 34980A Service Guide...

  • Page 116: Power Supply Removal

    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. Keysight 34980A Service Guide...
  • Page 117 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. Keysight 34980A Service Guide...

  • Page 118: 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. Keysight 34980A Service Guide...

  • Page 119: Kom Removal

    Use a 9/32” nut driver to remove the nuts holding the GP-IB connector on the rear panel. 4 Use a T20 Torx to remove the four screws holding the KOM printed circuit assembly to the mainframe. Lift out the assembly. Keysight 34980A Service Guide...

  • Page 120: Front Panel Removal

    Pull to unclip the ground connector from the mainframe. b Swing the two clips securing the front panel connector ribbon cable to the front panel circuit board and unplug the connector. Keysight 34980A Service Guide...

  • Page 121: Front Panel Disassembly

    1 Pull to remove the knob. Use a 7/16” nut driver to remove the nut from the knob shaft. 2 Remove the four T20 Torx screws from the circuit board and lift the circuit board out. You can now lift out the keypad. Keysight 34980A Service Guide...

  • Page 122: Dmm Removal

    3 Remove the two T20 Torx screws from the left front side of the mainframe. 4 Move the DMM assembly to the right and lift out. 5 Unplug the input cable from the backplane printed circuit board. Keysight 34980A Service Guide...

  • Page 123: Backplane Removal

    2 Use a 3/16” nut driver to remove the rear panel Analog Bus DB9 connector. Unclip the connector cable from the mainframe. 3 Remove the five T20 Torx screws holding the backplane assembly to the chassis and lift the printed circuit assembly out. Keysight 34980A Service Guide...
  • Page 124 Disassembly and Repair THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 125: Replaceable Parts

    Keysight 34980A Data Acquisition System Service Guide Replaceable Parts Replaceable Parts...

  • Page 126: To Order Replaceable Parts

    3 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. Keysight 34980A Service Guide...

  • Page 127: Mainframe Replaceable Parts

    Keypad 34980-48307 Front Panel 34980-66502 PCA - Front Panel 34980-49301 Window 34970-87401 Knob 34980-04104 Mainframe Cover, sheet metal 34980-48301 Rear Bezel 5041-9167 Foot 34980-48305 Cover, Analog Output 34980-48304 Cover, Slot 34980-66504 PCA, DMM 34980-68501 Fan Assembly Keysight 34980A Service Guide...

  • Page 128: 34921A Replaceable Parts

    K749, K750, K751, K752, K753, K754, K755, K756, K757, K758, K759, K760, K761, K762, K763, K764, K765, K766, K767, K768, K769, K770 RELAY 2C 12VDC-COIL K811, K812, K813, K814, K821, K822, K823, K824 0490-1954 Omron G6S-2-DC12 2A 250VAC Keysight 34980A Service Guide...

  • Page 129: 34923A Replaceable Parts

    U702, U703, U704, U705, U706, U707, U708, 50mA-MAX BVR 3V SMT U709, U710, U711, U712, U713, U714, U715, U716, U717, U718, U719, U720 RELAY 2C 12VDC-COIL 2A K800, K801, K802, K803, K804, K805, K806, K807 0490-1954 Omron G6S-2-DC12 250VAC Keysight 34980A Service Guide...

  • Page 130: 34931A Replaceable Parts

    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 RELAY 2C 12VDC-COIL K921, K922, K923, K924 0490-1954 Omron G6S-2-DC12 2A 250VAC Keysight 34980A Service Guide...

  • Page 131: 34932A Replaceable Parts

    K501, K502, K503, K504, K505, K506, K507, K508, RLY-DRY-RD-1A-8 PC 0490-2746 Coto 9000-0311 K601, K602, K603, K604, K605, K606, K607, K608 BUNDLE 0.5A 12V 300V RELAY 2C 12VDC-COIL K921, K922, K923, K924 0490-1954 Omron G6S-2-DC12 2A 250VAC Keysight 34980A Service Guide...

  • Page 132: 34937A Replaceable Parts

    N1810 switch options: – Option 124 24 VDC coil options – Option 201 “D” subminiature connectors – Option 402 Position Indicators. If the proper N1810 voltage option (Opt. 124) is not used, the switches could CAUTION be damaged. Keysight 34980A Service Guide...

  • Page 133: Vendor Addresses

    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 Littel fuse 800 East Northwest Highway Des Plains, IL 60016 U.S.A Keysight 34980A Service Guide...
  • Page 134 Replaceable Parts THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 135: Backdating

    Keysight 34980A Data Acquisition System Service Guide Backdating Backdating...
  • Page 136 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. Keysight 34980A Service Guide...

  • Page 137: Diagrams

    Keysight 34980A Data Acquisition System Service Guide Diagrams 34921A Component Locator 34922A Component Locator 34923A Component Locator 34924A Component Locator 34925A Component Locator (Top) 34925A Component Locator (Bottom) 34931A Component Locator 34932A Component Locator 34933A Component Locator 34937A Component Locator...

  • Page 138: 34921A Component Locator

    K613 K617 K737 K733 K618 K732 K738 K612 K603 K609 K723 K729 K614 K607 K734 K727 K610 K730 K616 K736 K722 K739 K602 K619 K731 K725 K611 K605 K726 K606 K615 K735 K601 K740 K620 K721 Keysight 34980A Service Guide...

  • Page 139: 34922A Component Locator

    K630 K765 K607 K742 K739 K631 K604 K766 K621 K614 K756 K749 K611 K629 K746 K764 K736 K760 K601 K625 K767 K632 K610 K745 K620 K626 K761 K755 K616 K615 K751 K750 K606 K741 K605 K740 Keysight 34980A Service Guide...

  • Page 140: 34923A Component Locator

    Diagrams 34923A Component Locator K621 K611 K503 K403 Keysight 34980A Service Guide...

  • Page 141: 34924A Component Locator

    Diagrams 34924A Component Locator K621 K611 Keysight 34980A Service Guide...

  • Page 142: 34925A Component Locator (Top)

    Diagrams 34925A Component Locator (Top) K802 K800 K806 K804 K803 K805 K807 K801 U606 U616 U613 U618 U620 U706 U703 U713 U718 U720 U601 U603 U612 U614 U619 U701 U707 U712 U714 U719 Keysight 34980A Service Guide...

  • Page 143: 34925A Component Locator (Bottom)

    Diagrams 34925A Component Locator (Bottom) U715 U705 U708 U717 U702 U615 U605 U608 U617 U602 U710 U709 U704 U716 U711 U610 U609 U604 U607 U611 Keysight 34980A Service Guide...

  • Page 144: 34931A Component Locator

    K8705 K8805 K8605 K8505 K7304 K7404 K7402 K7104 K8704 K8804 K8604 K8504 K7303 K7403 K7203 K7103 K8703 K8803 K8603 K8503 K7302 K7402 K7202 K7102 K8702 K8802 K8602 K8502 K7301 K7401 K7201 K7101 K8701 K8801 K8601 K8501 Keysight 34980A Service Guide...

  • Page 145: 34932A Component Locator

    K8705 K8805 K8605 K8505 K7304 K7404 K7402 K7104 K8704 K8804 K8604 K8504 K7303 K7403 K7203 K7103 K8703 K8803 K8603 K8503 K7302 K7402 K7202 K7102 K8702 K8802 K8602 K8502 K7301 K7401 K7201 K7101 K8701 K8801 K8601 K8501 Keysight 34980A Service Guide...

  • Page 146: 34933A Component Locator

    Diagrams 34933A Component Locator K704 K507 K607 K506 K606 K505 K605 K504 K604 K503 K603 K502 K602 K501 K601 Keysight 34980A Service Guide...

  • Page 147: 34937A Component Locator

    Diagrams 34937A Component Locator K612 K602 K626 K616 K603 K614 K617 K628 K629 K630 K632 K631 Keysight 34980A Service Guide...

  • Page 148: 34938A Component Locator

    Diagrams 34938A Component Locator K519 K508 K509 K518 K502 K503 K512 K513 Keysight 34980A Service Guide...
  • Page 149 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2006-2019 Edition 9, August 20, 2019 Printed in Malaysia *34980-90010* 34980-90010 www.keysight.com...

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