Keysight Technologies 34959A Service Manual
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Keysight Technologies 34959A Service Manual

Keysight Technologies 34959A Service Manual

Data acquisition system
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Keysight 34980A Data
Acquisition System
Service Guide

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Summary of Contents for Keysight Technologies 34959A

  • Page 1 Keysight 34980A Data Acquisition System Service Guide...
  • Page 2 INCLUDING BUT NOT LIMITED TO THE agreement and written consent from customarily provided to the public. IMPLIED WARRANTIES OF Keysight Technologies as governed by Accordingly, Keysight provides the MERCHANTABILITY AND FITNESS FOR A United States and international PARTICULAR PURPOSE. KEYSIGHT Software to U.S.

  • Page 3: Safety Symbols

    Safety Symbols The following symbols or markings that may be on or with the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument. Alternating current (AC) Frame or chassis (ground) terminal Standby supply.

  • Page 4: Safety Considerations

    Safety Considerations Read the information below before using this instrument. The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument.
  • Page 5 Hazardous voltage levels capable of causing death, may be present on a WARNING channel. Use extreme caution when handling, testing and adjusting this instrument. Any voltages greater than 30 Vrms, 42.4 Vpeak and 60 Vdc are considered hazardous (IEC 61010-1). ENVIRONMENTAL HEALTH &...
  • Page 6 When working with hazardous voltage levels, intentional closing of multiple WARNING bus and channel relays could cause a potential shock hazard on external connections. Use extreme caution when handling, testing and adjusting this instrument. Do not perform these procedures unless qualified to do so. Failure to recognize and observe normal safety precautions could result in personal injury or death.
  • Page 7 HIGH ENERGY SOURCES WARNING The Analog Buses are designed to handle inputs up to their rated currents or their rated powers, whichever is less. Under certain fault conditions, high energy sources could provide substantially more current or power than the instrument can handle.

  • Page 8: 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 for more information on the instrument general specifications.

  • Page 9: Regulatory Markings

    Regulatory Markings The CE mark is a registered trademark of the European Community. This CE The CSA mark is a registered mark shows that the product complies trademark of the Canadian with all the relevant European Legal Standards Association. Directives. The UK conformity mark is a UK The Keysight email address is required government owned mark.
  • Page 10 This symbol indicates the time period This instrument complies with the during which no hazardous or toxic WEEE Directive (2002/96/EC) marking substance elements are expected to requirement. This affixed product label leak or deteriorate during normal use. indicates that you must not discard Forty years is the expected useful life this electrical or electronic product in of the product.

  • Page 11: Waste Electrical And Electronic Equipment (Weee) Directive 2002/96/Ec

    Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC The crossed out wheeled bin symbol indicates that separate collection for waste electric and electronic equipment (WEEE) is required, as obligated by the EU DIRECTIVE and other National legislation. Please refer to keysight.com/go/takeback to understand your Trade in options with Keysight in addition to product takeback instructions.

  • Page 12: Front Panel At A Glance

    Front Panel at a Glance Keysight 34980A Service Guide...
  • Page 13 On/Standby switch This switch is standby only. To disconnect the mains from WARNING the instrument, remove the power cord. Under certain conditions, hazardous voltage levels capable of WARNING causing injury or death may remain even after external circuits have been disconnected. To avoid electrical shock, remove the main power cord from the 34980A and ensure all connections to the DUT, including field wiring to the instrument and the analog bus (if present) are deenergized and all circuits are discharged...
  • Page 14 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. Configure keys select functions and set function parameters 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.

  • Page 15: 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 16 Module ground screw Slot cover over slot 2 AC power connector 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.

  • Page 17: Rear Panel Connector Pinouts

    Rear Panel Connector Pinouts External Trigger/Alarms Connector (Male D-Sub) Input Ext Trig Input / Chan Adv Input (Pin 6) > 1 μs Output Gnd (Pin 9) 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)

  • Page 18: Analog Bus Connector (Female D-Sub)

    Analog Bus Connector (Female D-Sub) ANALOG BUSSES Internal DMM Current Input (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 19 Display Indicator Definition Communicating with the 34980A over LAN. Communicating with the 34980A over USB. GPIB Communicating with the 34980A over GPIB. ABUS [1234] 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.

  • Page 20: Front Panel Menu Reference

    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 –...
  • Page 21 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 –...

  • Page 22: 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 23 425.6 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 24 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 25: Table Of Contents

    ........38 Keysight Technologies Calibration Services .
  • Page 26 Adjustment is Recommended ......38 Time Required for Calibration ......39 Automating Calibration Procedures .
  • Page 27 34923A 40/80-Channel Reed Multiplexer ....96 34924A 70-Channel Reed Multiplexer ..... . .99 34925A 40/80-Channel Optically-Isolated FET Multiplexer .
  • Page 28 34933A Replaceable Parts ....... 139 34937A Replaceable Parts ....... 139 34938A Replaceable Parts .
  • Page 29 Keysight 34980A Data Acquisition System Service Guide Obtaining Service Obtaining Service...

  • Page 30: Obtaining Service

    Long test leads can act as an antenna causing pick–up of ac signals. Types of Service Available If the 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 31: 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 32: Cleaning

    Obtaining Service Cleaning Clean the outside of the instrument with a soft, lint–free, slightly dampened cloth. Do not use detergent. Disassembly is not required or recommended for cleaning. To prevent electrical shock, disconnect the instrument from mains and WARNING external circuits before cleaning. Use a dry cloth or one slightly dampened with water (or 70% Isopropyl Alcohol) to clean the external case parts.

  • Page 33: Electrostatic Discharge (Esd) Precautions

    Obtaining Service – 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).
  • Page 34 Obtaining Service THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 35: 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 36 Specifications THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...
  • Page 37 Keysight 34980A Data Acquisition System Service Guide Calibration Procedures Calibration Procedures Internal DMM Plug-in Modules...

  • Page 38: Calibration Procedures

    Keysight Technologies Calibration Services Keysight Technologies offers calibration services at competitive prices. When your instrument is due for calibration, contact your local Keysight Service Center for recalibration. See “Types of Service Available”...

  • Page 39: Time Required For Calibration

    Calibration Procedures 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 42) to verify that all adjustments have been performed. Time Required for Calibration The 34980A can be automatically calibrated under computer control.

  • Page 40: Recommended Test Equipment

    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 Keysight 3458A 8½-digit Digital Multimeter to measure less accurate yet stable sources.

  • Page 41: Calibration Security

    Calibration Procedures 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. If you forget your security code, you can disable the security feature by following NOTE the procedure below.

  • Page 42: Calibration Message

    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.

  • Page 43: Calibration Process

    Calibration Procedures Calibration Process The following general procedure is the recommended method to complete a full instrument calibration. 1 Read “DMM Test Considerations” on page 48 and “Plug-in Module Test Considerations” on page 61. 2 Perform the verification tests to characterize the instrument (incoming data). 3 Unsecure the instrument for calibration (“Calibration Security”...

  • Page 44: Performance Verification Tests

    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: –...
  • Page 45 Calibration Procedures 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.

  • Page 46: Internal Dmm

    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.
  • Page 47 Calibration Procedures In this manual, the direct ABus connection is the one described. Connections for the 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.

  • Page 48: Dmm Test Considerations

    Calibration Procedures 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: –...

  • Page 49: Internal Dmm Verification Tests

    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.
  • Page 50 Calibration Procedures Error from Nominal Quick Check Input Range 24 hour 90 day 1 year Function 100  Short ± 3.5 m ± 4 m ± 4 m Short 1 k ± 6 m ± 10 m ± 10 m Short 10 k...
  • Page 51 Calibration Procedures Input Error from Nominal Quick Check Range 24 hour 90 day 1 year Function 100 mV 100 mV ± 6.5 µV ± 8 µV ± 9 µV ± 26 µV ± 37 µV ± 47 µV 10 V DC Volts 10 V ±...
  • Page 52 Calibration Procedures AC VOLTS Gain Verification Test Configuration: AC Volts CONFigure[:VOLTage]:AC LF 3 HZ:SLOW [SENSe:]VOLTage:AC:BANDwidth 3 1 Make sure you have read “DMM Test Considerations” on page 48. 2 Set the AC VOLTS function and the 3 Hz input filter. With the slow filter selected, each measurement takes 7 seconds to complete.
  • Page 53 Calibration Procedures The 50 kHz ac voltage test points may fail performance verification if the DMM NOTE internal shields have been removed and reinstalled. See “Gain Adjustment” page 57 for further information on how to recalibrate the ac voltage function. AC CURRENT Gain Verification Test Configuration: AC Current CONFigure:CURRent:AC...
  • Page 54 Calibration Procedures Frequency Gain Verification Test Configuration: Frequency 6½ digits [SENSe:]FREQuency:APERture 1 1 Make sure you have read “DMM Test Considerations” on page 48. 2 Select the FREQUENCY function and set 6½ digits. 3 Select each range in the order shown below. Provide the input voltage and frequency indicated.

  • Page 55: Optional Ac Performance Verification Tests

    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...

  • Page 56: Internal Dmm Adjustments

    Calibration Procedures Internal DMM Adjustments You will need a test input fixture to adjust the internal DMM (see page 46). 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.

  • Page 57: Gain Adjustment

    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.
  • Page 58 Calibration Procedures Valid Gain Adjustment Input Values Gain adjustment can be accomplished using the following input values. Function Range Valid Calibration Input Values DC VOLTS 100 mV to 100 V 0.9 to 1.1 x Full Scale 300 V 250 V to 303 V OHMS, OHMS 4W 100...
  • Page 59 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 Review the “DMM Test Considerations” on page 48 and “Gain Adjustment Considerations”...
  • Page 60 Calibration Procedures –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”...

  • Page 61: Plug-In Modules

    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. –...

  • Page 62: 34951A 4-Ch Isolated Dac Module

    Calibration Procedures 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.
  • Page 63 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. Keysight 34980A Service Guide...
  • Page 64 Calibration Procedures 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 Using the input test connector described on page 63, leave the current input terminal open.
  • Page 65 Calibration Procedures Output Voltage Quick Check Error from Nominal (90 day) 16 V ± 11 mV 12 V ± 9 mV 10 V ± 8 mV ± 7 mV ± 5 mV ± 3 mV ± 5 mV -8 V ±...
  • Page 66 Calibration Procedures 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.
  • Page 67 Calibration Procedures Following the auto-calibration procedure, the DMM is left in its reset state NOTE (DCV). Keysight 34980A Service Guide...

  • Page 68: 34952A Multifunction Module

    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.
  • Page 69 Calibration Procedures 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 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.
  • Page 70 Calibration Procedures 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.

  • Page 71: Relay Plug-In Modules

    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.
  • Page 72 Calibration Procedures – 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.

  • Page 73: Thermocouple Reference Junction 34921A (Optional)

    Calibration Procedures Thermocouple Reference Junction 34921A (Optional) You should perform these verification if you are using the module for NOTE 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.
  • Page 74 Calibration Procedures THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 75: Troubleshooting And Diagnostics

    Keysight 34980A Data Acquisition System Service Guide Troubleshooting and Diagnostics Troubleshooting and Diagnostics...

  • Page 76: Troubleshooting Hints

    Troubleshooting and Diagnostics Troubleshooting and Diagnostics This chapter provides basic instructions to isolate a problem. Removal of the instrument's cover is to be conducted by qualified personnel WARNING only. Only qualified, trained personnel who are aware of the hazards involved should remove instrument covers, or access any external circuits, test fixtures, cables or wherever hazardous voltages may be present.

  • Page 77: Power Supply

    Troubleshooting and Diagnostics Unit fails self-test 1 Check the display for the power on self test results. 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.

  • Page 78: Product Firmware Updates

    Troubleshooting and Diagnostics 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 79: Error Numbers

    Troubleshooting and Diagnostics 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. The interface-specific and global error queues are cleared by the *CLS (Clear Status) command and when power is cycled.
  • Page 80 Troubleshooting and Diagnostics Error Description -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"...
  • Page 81 Troubleshooting and Diagnostics Error Description "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"...
  • Page 82 Troubleshooting and Diagnostics Error Description "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"...
  • Page 83 Troubleshooting and Diagnostics Error Description "Self-test: front panel not responding" "Self-test: RAM read/write" "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"...
  • Page 84 Troubleshooting and Diagnostics Calibration Errors The following errors indicate failures that may occur during a calibration. Often, performing the calibration again will clear these errors. Error Description "Cal security disabled by jumper" "Cal: secured" "Cal: invalid secure code" "Cal: secure code too long" "Cal: aborted"...
  • Page 85 Troubleshooting and Diagnostics Error Description "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"...
  • Page 86 Troubleshooting and Diagnostics "Firmware update error; bad checksum for download start" "Firmware update error; bad checksum for download complete" "Firmware update error; download in progress" "Firmware update error; unable to complete download" "Firmware update error; invalid programming address" "State has not been restored" "Operation has not been implemented"...
  • Page 87 Troubleshooting and Diagnostics Error Description "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"...

  • Page 88: Isolate A Problem With A Plug-In Module

    Troubleshooting and Diagnostics Error Description "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"...

  • Page 89: Relay And Fet Replacement

    4-channel isolated D/A converter Module replacement 34952A Multifunction module Module replacement 34959A Breadboard module Module replacement 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: –...

  • Page 90: 34921A 40-Channel Armature Multiplexer With Low Thermal Offset

    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.
  • Page 91 Troubleshooting and Diagnostics For the 34921A, relay and fuse part numbers are given on page 134 and the component locator is shown on page 141. The table below shows the relationship of channel numbers to relay numbers. Bank 1 Bank 2 Channel Relay Channel...
  • Page 92 Troubleshooting and Diagnostics Bank 1 Bank 2 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 Backplane Backplane K911 K921 K912 K922 K913 K923...

  • Page 93: 34922A 70-Channel Armature Multiplexer

    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.
  • Page 94 Troubleshooting and Diagnostics For the 34922A, relay part numbers are given on page 136 and the component locator is shown on page 145. The table on the next page shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 95 Troubleshooting and Diagnostics Bank 1 Bank 2 Channel Relay Channel Relay K601 K736 K602 K737 K603 K738 K604 K739 K605 K740 K606 K741 K607 K742 K608 K743 K609 K744 K610 K745 K611 K746 K612 K747 K613 K748 K614 K749 K615 K750 K616 K751...

  • Page 96: 34923A 40/80-Channel Reed Multiplexer

    Troubleshooting and Diagnostics Bank 1 Bank 2 K626 K761 K627 K762 K628 K763 K629 K764 K630 K765 K631 K766 K632 K767 K633 K768 K634 K769 K635 K770 Backplane Backplane K811 K821 K812 K822 K813 K823 K814 K824 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.
  • Page 97 Troubleshooting and Diagnostics For the 34923A, relay part numbers are given on page 137 and the component locator is shown on page 146. The table below shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 98 Troubleshooting and Diagnostics Bank 1 Bank 2 2-, 4-Wire 2-, 4-Wire 1-wire Channel Relay 1-Wire Channel Relay Channel Channel 001, 002 K401 041, 042 K501 003, 004 K401 043, 044 K501 005, 006 K402 045, 046 K502 007, 008 K403 047, 048 K503 009, 010...

  • Page 99: 34924A 70-Channel Reed Multiplexer

    Troubleshooting and Diagnostics Bank 1 Bank 2 K613 K623 K614 K624 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.
  • Page 100 Troubleshooting and Diagnostics For the 34924A, relay part numbers are given on page 137 and the component locator is shown on page 147. The table below shows the relationship of channel numbers to relay numbers. Keysight 34980A Service Guide...
  • Page 101 Troubleshooting and Diagnostics Bank 1 Bank 2 Channel Relay Channel Relay K401 K501 K403 K503 K404 K504 K408 K508 K408 K508 K402 K502 K403 K503 K404 K504 K409 K509 K407 K507 K401 K501 K404 K505 K404 K504 K408 K508 K408 K508 K402 K502...
  • Page 102 Troubleshooting and Diagnostics Bank 1 Bank 2 K404 K505 K406 K506 K407 K507 K409 K509 K402 K502 K401 K501 K404 K505 K406 K506 K406 K506 Backplane Backplane K611 K621 K612 K622 K613 K623 K614 K624 Keysight 34980A Service Guide...

  • Page 103: 34925A 40/80-Channel Optically-Isolated Fet Multiplexer

    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.
  • Page 104 Troubleshooting and Diagnostics Keysight 34980A Service Guide...
  • Page 105 Troubleshooting and Diagnostics For the 34925A, FET part numbers are given on page 137 and the component locator is shown on page 148. The table below shows the relationship of channel numbers to relay numbers. Bank 1 Bank 2 2-, 4-Wire 2-, 4-Wire 1-wire Channel 1-Wire Channel...

  • Page 106: 34931A Dual 4X8 Armature Matrix

    Troubleshooting and Diagnostics Bank 1 Bank 2 K801 K805 K802 K806 K803 K807 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.
  • Page 107 Troubleshooting and Diagnostics Matrix 1 and Matrix 2 are electrically separate from one another. Matrix Relays: Armature latching. Analog Bus Relays: Armature non-latching. For the 34931A, relay part numbers are given on page 138 and the component locator is shown on page 150.
  • Page 108 Troubleshooting and Diagnostics Matrix 1 Matrix 2 Channel Relay Channel Relay K7101 K8501 K7102 K8502 K7103 K8503 K7104 K8504 K7105 K8505 K7106 K8506 K7107 K8507 K7108 K8508 K7201 K8601 K7202 K8602 K7203 K8603 K7204 K8604 K7205 K8605 K7206 K8606 K7207 K8607 K7208 K8608...

  • Page 109: 34932A Dual 4X16 Armature Matrix

    Troubleshooting and Diagnostics Matrix 1 Matrix 2 K7402 K8802 K7403 K8803 K7404 K8804 K7405 K8805 K7406 K8806 K7407 K8807 K7408 K8808 Backplane K921 K922 K923 K924 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.
  • Page 110 Troubleshooting and Diagnostics Matrix 1 and Matrix 2 are electrically separate from one another. Matrix Relays: Armature latching. Analog Bus Relays: Armature non-latching For the 34932A, relay part numbers are given on page 138 and the component locator is shown on page 151.
  • Page 111 Troubleshooting and Diagnostics Matrix 1 Matrix 2 Channel Relay Channel Relay K7101 K8501 K7102 K8502 K7103 K8503 K7104 K8504 K7105 K8505 K7106 K8506 K7107 K8507 K7108 K8508 K7109 K8509 K7110 K8510 K7111 K8511 K7112 K8512 K7113 K8513 K7114 K8514 K7115 K8515 K7116 K8516...
  • Page 112 Troubleshooting and Diagnostics Matrix 1 Matrix 2 K7211 K8611 K7212 K8612 K7213 K8613 K7214 K8614 K7215 K8615 K7216 K8616 K7301 K8701 K7302 K8702 K7303 K8703 K7304 K8704 K7305 K8705 K7306 K8706 K7307 K8707 K7308 K8708 K7309 K8709 K7310 K8710 K7311 K8711 K7312 K8712...
  • Page 113 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 114: 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  in-rush resistors that are used to protect the reed relays from reactive loads.
  • Page 115 Troubleshooting and Diagnostics 34933A Two-Wire Mode 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 100Ω.
  • Page 116 Troubleshooting and Diagnostics 34933A One-Wire Mode Keysight 34980A Service Guide...
  • Page 117 Troubleshooting and Diagnostics For the 34933A, relay part numbers are given on page 139 and the component locator is shown on page 152. The table on the next page shows the relationship of channel numbers to relay numbers. Matrix 1 Matrix 2 2-Wire Channel 1-Wire Channel...

  • Page 118: 34937A 32-Channel Gp Switch

    Troubleshooting and Diagnostics Matrix 1 Matrix 2 138, 238 K501 338, 438 K601 141, 241 K505 341, 441 K605 142, 242 K508 342, 442 K608 143, 243 K507 343, 443 K607 144, 244 K506 344, 444 K606 145, 245 K504 345, 445 K604 146, 246...
  • Page 119 Troubleshooting and Diagnostics For the 34937A, relay part numbers are given on page 139 and the component locator is shown on page 153. The table below shows the relationship of channel numbers to relay numbers. Bank 1 Bank 2 Channel Relay Channel Relay...

  • Page 120: 34938A 20-Channel High-Current Gp Switch

    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 139 and the component locator is shown on page 154.
  • Page 121 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 122: Disassembly And Repair

    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.

  • Page 123: Basic Disassembly

    Disassembly and Repair Basic Disassembly Observe the electrostatic discharge precautions given on page 122. 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.

  • Page 124: 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 125 Disassembly and Repair ou can stand the power supply on end and insert it For testing purposes, y NOTE into slots in the mainframe as shown. 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.

  • Page 126: Power Supply Disassembly

    Disassembly and Repair 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.

  • Page 127: Kom Removal

    Disassembly and Repair KOM Removal 1 Remove the power supply (see the procedure on page 124). 2 Disconnect the two ribbon cables on the top of the chassis. 3 Use a 3/16” nut driver to remove the nuts holding the Ext Trig DB9 connector on the rear panel.

  • Page 128: Front Panel Removal

    Disassembly and Repair 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 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.

  • Page 129: Front Panel Disassembly

    Disassembly and Repair 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.

  • Page 130: Dmm Removal

    Disassembly and Repair DMM Removal 1 To remove the DMM (if installed), remove the front panel (see the procedure on page 128). 2 Unplug the ribbon cable at the top of the DMM assembly. 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.

  • Page 131: Backplane Removal

    Disassembly and Repair Backplane Removal 1 Remove the front panel (see the procedure on page 128) and the DMM (see the procedure on page 130). 2 Use a 3/16” nut driver to remove the rear panel Analog Bus DB9 connector. Unclip the connector cable from the mainframe.
  • Page 132 Disassembly and Repair THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 34980A Service Guide...

  • Page 133: Replaceable Parts

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

  • Page 134: To Order Replaceable Parts

    Replaceable Parts Replaceable Parts This section contains information for ordering replacement parts for the instrument. Parts are listed in alphanumeric order according to their reference designators. The parts lists include a brief description of each part with applicable Keysight part number. To Order Replaceable Parts You can order replaceable parts from Keysight using the Keysight part number.

  • Page 135: Mainframe Replaceable Parts

    Replaceable Parts Mainframe Replaceable Parts Refer to the disassembly drawings beginning on page 123. Keysight Part Number Description 34980-66513 PCA - backplane 34980-66521 PCA - KOM and Power Supply 34980-67601 Line Filter Assembly 34980-61601 Cable, KOM to Backplane 34980-61604 Cable, front panel to KOM and DMM 34980-61606 Cable, Power Supply 34980-61607...

  • Page 136: 34921A Replaceable Parts

    Replaceable Parts 34921A Replaceable Parts A component locator is shown on page 144. Component Locator Keysight P/N Description F1041, F1042, F1043, F1044 2110-0043 FUSE 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, 0490-1896 RELAY...

  • Page 137: 34923A Replaceable Parts

    Replaceable Parts 34923A Replaceable Parts A component locator is shown on page 146. Component Locator Keysight P/N Description 0490-2746/ K401, K402, K403, K404, K405, K501, K502, K503, K504, K505 RELAY 0490-3259 K609, K611, K612, K613, K614, K621, K622, K623, K624 0490-1954 RELAY 34924A Replaceable Parts...

  • Page 138: 34931A Replaceable Parts

    Replaceable Parts 34931A Replaceable Parts A component locator is shown on page 150. Component Locator Keysight P/N Description 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, 0490-1896 RELAY...

  • Page 139: 34933A Replaceable Parts

    Replaceable Parts 34933A Replaceable Parts A component locator is shown on page 152. Component Locator Keysight P/N Description K501, K502, K503, K504, K505, K506, K507, K508, K601, K602, 0490-2746/ RELAY K603, K604, K605, K606, K607, K608 0490-3259 K921, K922, K923, K924 0490-1954 RELAY 34937A Replaceable Parts...

  • Page 140: 34946A And 34947A Replaceable Parts

    Replaceable Parts 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. If the proper N1810 voltage option (Opt.

  • Page 141: Backdating

    Keysight 34980A Data Acquisition System Service Guide Backdating Backdating...
  • Page 142 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 143: 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 34938A Component Locator...

  • Page 144: 34921A Component Locator

    Diagrams 34921A Component Locator K931 K842 K841 K844 K843 K842S K841S K844S K843S K608 K604 K728 K724 K613 K617 K737 K733 K618 K732 K738 K612 K729 K603 K609 K723 K614 K607 K734 K727 K610 K730 K616 K736 K722 K739 K602 K619 K731 K725...

  • Page 145: 34922A Component Locator

    Diagrams 34922A Component Locator K811 K608 K758 K623 K743 K618 K753 K738 K603 K627 K769 K634 K762 K612 K763 K628 K747 K602 K635 K737 K770 K633 K609 K744 K768 K754 K622 K619 K757 K617 K624 K752 K759 K630 K765 K607 K742 K739 K631...

  • Page 146: 34923A Component Locator

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

  • Page 147: 34924A Component Locator

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

  • Page 148: 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 149: 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 150: 34931A Component Locator

    Diagrams 34931A Component Locator K924 K7308 K7408 K7208 K7108 K8708 K8808 K8608 K8508 K7307 K7407 K7207 K7107 K8707 K8807 K8607 K8507 K7306 K7406 K7206 K7106 K8706 K8806 K8606 K8506 K7305 K7405 K7205 K7105 K8705 K8805 K8605 K8505 K7304 K7404 K7402 K7104 K8704 K8804 K8604 K8504 K7303 K7403 K7203 K7103 K8703 K8803 K8603 K8503...

  • Page 151: 34932A Component Locator

    Diagrams 34932A Component Locator K924 K7316 K7416 K7216 K7116 K8716 K8816 K8616 K8516 K7315 K7415 K7215 K7115 K8715 K8815 K8615 K8515 K7314 K7414 K7214 K7114 K8714 K8814 K8614 K8514 K7313 K7413 K7213 K7113 K8713 K8813 K8613 K8513 K7312 K7412 K7412 K7112 K8712 K8812 K8612 K8512 K7311 K7411 K7211...

  • Page 152: 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 153: 34937A Component Locator

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

  • Page 154: 34938A Component Locator

    Diagrams 34938A Component Locator K519 K508 K509 K518 K502 K503 K512 K513 Keysight 34980A Service Guide...
  • Page 155 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2006-2022 Edition 11, Aug 2022 Printed in Malaysia  34980-90010 www.keysight.com...

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