Keysight Technologies DAQ970A Service Manual
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Keysight Technologies DAQ970A Service Manual

Data acquisition system
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Keysight DAQ970A/DAQ973A
Data Acquisition System
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Summary of Contents for Keysight Technologies DAQ970A

  • Page 1 Keysight DAQ970A/DAQ973A Data Acquisition System Service Guide...
  • Page 2 FAR 27.401 or DFAR could result in personal injury or death. 227.7103-5 (c), as applicable in any Do not proceed beyond a WARNING technical data. notice until the indicated conditions are fully understood and met. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 3: Software Revision

    This product uses Microsoft Windows CE. Keysight highly recommends that all Windows-based computers connected to Windows CE instruments use current anti-virus software. For more information, go to the respective product page at: – www.keysight.com/find/DAQ970A – www.keysight.com/find/DAQ973A Keysight DAQ970A/DAQ973A Service Guide...

  • Page 4: Safety Considerations

    DO NOT REMOVE THE INSTRUMENT COVER WARNING Only qualified, service-trained personnel who are aware of the hazards involved should remove the instrument covers. Always disconnect the power cable and any external circuits before removing the instrument cover. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 5 – DAQM909A: +/-18Vpk (single ended) for both HI and LO pins. DO NOT CONNECT ANY MODULE CHANNELS TO MAINS WARNING Measurement category of the instrument is rated as CAT 'Others', terminals should not be directly connected to the mains. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 6 This is a sensitive measurement apparatus by design and may have some performance loss when exposed to ambient continuous electromagnetic phenomenon. Consider using shielded or twisted cables, common mode chokes, ferrite clamps, and damping resistors before the input to the DAQ970A/DAQ973A. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 7 Clean the outside of the instrument using a soft, lint-free, cloth slightly dampened with water. Do not use detergent or solvents. Do not attempt to clean internally. If needed, contact a Keysight Technologies Sales and Service Office to arrange for proper cleaning to ensure that safety features and performance are maintained.

  • Page 8: Environmental Conditions

    Environmental Conditions The DAQ970A/DAQ973A is designed for indoor use and in an area with low condensation. The table below shows the general environmental requirements for this instrument. Environmental condition Requirement Operating condition – 0 °C to 55 °C Temperature Storage condition –...

  • Page 9: Regulatory Information

    – Canada: CAN/CSA-C22.2 No.61010-1-12; CAN/CSA-C22.2 No. 61010-2-030-12 – USA: ANSI/UL Std. No. 61010-1:2012; ANSI/UL Std No.61010-2-030:2012 EMC compliance: – IEC 61326-1:2012 / EN 61326-1:2013 – Canada: ICES/NMB-001:2006 – Australia/New Zealand: AS/NZS CISPR 11:2011 – South Korea RRA Notice 2016-24 Keysight DAQ970A/DAQ973A Service Guide...

  • Page 10: Safety Symbols And Regulatory Markings

    Conformity for this instrument can be leak or deteriorate during normal use. obtained by contacting your local Forty years is the expected useful life Keysight Technologies Sales of the product. Representative. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 11: South Korean Class A Emc Declaration

    This instrument has been conformity assessed for used in business environments. In a residential environment this equipment may caused radio interference. This EMC statement applies to the equipment only for use in business environment. " " Keysight DAQ970A/DAQ973A Service Guide...

  • Page 12: Waste Electrical And Electronic Equipment (Weee) Directive

    To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/DAQ970A www.keysight.com/find/DAQ973A (product-specific information and support, software and documentation updates) – www.keysight.com/find/assist (worldwide contact information for repair and service) Keysight DAQ970A/DAQ973A Service Guide...

  • Page 13: Table Of Contents

    ..........28 Keysight DAQ970A/DAQ973A Service Guide...
  • Page 14 ........50 Calibration Adjustment Sequence ......51 Keysight DAQ970A/DAQ973A Service Guide...
  • Page 15 ....84 DAQM904A relay contact resistance verification (optional) ..85 DAQM904A shorted relay contact verification ....88 Keysight DAQ970A/DAQ973A Service Guide...
  • Page 16 Thermocouple Reference Junction Verification (Optional) ..94 DAQM909A DC/AC Coupling Verification (Optional) ....95 Keysight DAQ970A/DAQ973A Service Guide...
  • Page 17 Keysight DAQ970A/DAQ973A Data Acquisition System Service Guide Service and Repair General Information Troubleshooting Self-test Procedures Battery Check and Replacement Disassembly This chapter discusses the procedures involved for returning a failed instrument to Keysight Technologies for service or repair.

  • Page 18: Service And Repair

    The Keysight Unit Exchange applies to the DAQ970A/DAQ973A mainframe only. Plug-in modules are not supported as exchange assemblies. When exchanging the DAQ970A/DAQ973A, do not ship the plug-in modules with your instrument. Remove all plug-in modules and customer wiring before shipping the unit to Keysight.

  • Page 19: Repackaging For Shipment

    Service and Repair Repackaging for shipment If the unit is to be shipped to Keysight Technologies for service or repair, be sure – Attach a tag to the unit identifying the owner and indicating the required service or repair. – Include the instrument model number and your full serial number.

  • Page 20: User Replaceable Parts

    You can find the instrument support part list at Keysight's Test & Measurement Parts Catalog at http://www.keysight.com/find/parts. Specifications and characteristics For the specifications and characteristics on the mainframe and plug-in modules, refer to the data sheet at http://literature.cdn.keysight.com/litweb/pdf/ 5992-3168EN.pdf. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 21: Troubleshooting

    Service and Repair Troubleshooting Operating checklist Before returning your instrument to Keysight Technologies for service or repair, check the following items: 1 Is the instrument inoperative? – Verify that the AC power cord is connected to the instrument. – Verify that the front panel [On/Standby] switch has been pushed.
  • Page 22 Recalibration or resetting the state should clear the error. If the error persists, a hardware failure may have occurred. A list of all error codes can be found in the DAQ970A/DAQ973A Programming Guide. Isolating to an assembly –...

  • Page 23: Self-Test Procedures

    1 Connect to the instrument using the remote USB interface. 2 Send and read the result: pass ( ) or fail ( *TST? to view the errors in the error queue. Refer to DAQ970A/ SYSTem:ERRor? DAQ973A Programming Guide for a complete list of self-test errors. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 24: Full Self-Test

    ( ) or fail ( TEST:ALL? Send to read the errors in the error queue. Refer to the DAQ970A/ SYSTem:ERRor? DAQ973A Programming Guide for a complete list of self-test errors. Plug-in module self-test No user self-test exists for the plug-in modules. The plug-in modules perform their own self-test when power is applied.

  • Page 25: Self-Test Duration

    Full self-test with 3 units of DAQM909A in one mainframe: Total duration = Internal DMM + (3 x DAQM909A) = 3 + (3 x 23) = ~72 seconds All self-test operations (power-on self-test, or full self-test) will always include NOTE the mainframe’s internal DMM. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 26: Battery Check And Replacement

    204, “Memory lost: time and date” Verifying the capacity of the battery is recommended at the instrument’s annual calibration. If you need to verify or replace the battery on the DAQ970A/DAQ973A, be sure to unplug the instrument first. See “To verify or replace the battery”...

  • Page 27: To Verify Or Replace The Battery

    5 Replace the instrument cover, apply power, and turn the instrument on; the instrument will generate an error and beep (this is normal). 6 Set the date and time according to the procedures shown in the DAQ970A/ DAQ973A User’s Guide.

  • Page 28: Disassembly

    Only service-trained personnel who are aware of the hazards involved should remove the instrument covers. Dangerous voltages may be encountered with the instrument covers removed. To prevent damage to the fan, do not over tighten the fan screws. CAUTION Keysight DAQ970A/DAQ973A Service Guide...

  • Page 29: General Disassembly

    Service and Repair General disassembly Keysight DAQ970A/DAQ973A Service Guide...

  • Page 30: Internal Dmm Disassembly

    Service and Repair Internal DMM disassembly Disconnect Keysight DAQ970A/DAQ973A Service Guide...

  • Page 31: Front Panel Disassembly

    Service and Repair Front panel disassembly Reverse side Keysight DAQ970A/DAQ973A Service Guide...

  • Page 32: Additional Chassis Disassembly

    Service and Repair Additional chassis disassembly DAQ970A rear panel DAQ973A rear panel Keysight DAQ970A/DAQ973A Service Guide...
  • Page 33 Keysight DAQ970A/DAQ973A Data Acquisition System Service Guide Calibration Procedures Keysight Technologies Calibration Service Calibration Interval Time Required for Calibration Automating Calibration Procedures Recommended Test Equipment Input Connections Calibration Security Calibration Message Calibration Count Recommended Calibration Procedure Aborting a Calibration in Progress...

  • Page 34: Calibration Procedures

    Whatever calibration interval you select, Keysight recommends that complete re-adjustment should always be performed at the calibration interval. This will assure that the DAQ970A/DAQ973A will remain within specification for the next calibration interval. This criteria for re-adjustment provides the best long-term stability.

  • Page 35: Automating Calibration Procedures

    The instrument must be unsecured prior to initiating the calibration procedure. For further information on programming the instrument, see the DAQ970A/ DAQ973A Programming Guide. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 36: Recommended Test Equipment

    <1/5 instrument 24 hours specification Keysight 33500B Series Function/ Frequency <1/5 instrument 24 hours specification Arbitrary Waveform Generator [a] In addition to the internal DMM, these applications require an input multiplexer module. The Keysight DAQM901A multiplexer module is recommended. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 37: Input Connections

    – For DC voltage, 2-wire and 4-wire resistance, Channel 303 and 313 are used for zero test connections as illustrated below: – For DC current, Channel 321 is used for zero test and left OPEN. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 38: Input Test Signal

    – AMPS and LO for DC/AC current should be a twisted pair (Channel 321). All test cable shields should be tied to Input LO and ground referenced at the calibrator's output terminals. This configuration is recommended for noise reduction and settling time performance during calibration. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 39: Calibration Security

    The procedures to enter the security code is described on page 40. – The security code is set to “DAQ970A” when the instrument is shipped from the factory. The security code is stored in non-volatile memory, and does not...

  • Page 40: To Unsecure For Calibration

    After entering the correct security code, press Done. When you return to the menu, you will see new menu choices New Code, LOCK, and Secure (Off/On). Refer to the DAQ970A/DAQ973A User’s Guide for more information on these new choices. The System Security status now reads: UNLOCKED...

  • Page 41: To Change The Security Code

    3 Verify the new code, and press Yes to confirm the change. 4 Press LOCK to secure the instrument with the new code. Remote interface operation: CALibration:SECure:CODE <new_code> Changing the code from the front panel also changes the code as seen from the remote interface. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 42: To Unsecure The Instrument Without The Security Code

    4 Replace the instrument cover, apply power, and turn the instrument on; the instrument will generate an error and beep (this is normal). Wait 30 to 40 seconds for the instrument to power up completely. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 43 Calibration Procedures 5 Reset the security code to the factory default: a Press [Utility] > Security > New Code. b Enter “DAQ970A” as the new passcode. c Press Done. d Verify the new code, and press Yes to confirm the change.

  • Page 44: Calibration Message

    To read the calibration count, press [Utility] > Calibrate on the front panel or send from the remote interface. You can read the calibration CALibration:COUNt? count whether the instrument is secured or unsecured. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 45: Recommended Calibration Procedure

    Typically, upon re-applying power, the instrument will report error 705 Cal:Aborted. You may also generate errors 740 through 746. If this occurs, you should not use the instrument until a complete re-adjustment has been performed. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 46: Calibration Actions

    Remote interface operation: Enter cal value: CALibration:VALue <value> Perform calibration: CALibration[:ALL]? Storing calibration constants To store calibration values in non-volatile memory, use the following: Front panel operation: [Utility] > Calibrate > Save Cal Values Remote interface operation: CALibration:STORe Keysight DAQ970A/DAQ973A Service Guide...

  • Page 47: Test Considerations

    – Allow at least a 60-minute warm-up period with a 4-wire copper short and the 5-wire input test signal cable connected to the respective channels in the DAQM901A multiplexer module installed in slot 300 before verification or adjustment. For more information, see “Input Connections” on page 37. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 48: Calibrator Setup

    – Allow at least a 60-minute warm-up period for Fluke calibrator to stabilize. – Perform DC zero calibration (it takes approximately 2.5 minutes to complete) from the front panel at least once every 30 days to ensure its performance accuracy. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 49: Channel Delay

    [a] The additional delay times for varying input ranges are needed for the instrument's test current source to stabilize for test leads > 1 meter in length during ohms measurement, especially as the range increases, the test current source decreases, which is particularly sensitive to environmental changes. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 50: Channel Monitor

    To disable monitoring, press [Monitor] key again on the Monitor menu page. Remote interface operation: To select channel for monitor: ROUTe:MONitor (@<channel>) To enable/disable channel monitor: ROUTe:MONitor:STATe {OFF|ON} Keysight DAQ970A/DAQ973A Service Guide...

  • Page 51: Calibration Adjustment Sequence

    Calibration Procedures Calibration Adjustment Sequence Given the sensitivity of the 6.5 digits internal DMM within the DAQ970A/ DAQ973A, it is imperative to follow the calibration sequence as stated below: Sequence Functions Section Zero and ADC calibration Zero adjustment AC voltage low frequency gain and flatness calibration...

  • Page 52: Zero Adjustment

    Succeeded” message indicates success; if the display shows “Calibration Step Failed”, check the input value, range, function, and entered calibration value, and repeat the calibration step. 8 Press Perform ADC Cal to initiate the ADC calibration. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 53: Ac Zero Calibration

    Succeeded” message indicates success; if the display shows “Calibration Step Failed”, check the input value, range, function, and entered calibration value, and repeat the calibration step. 8 Store the new AC zero calibration constants (see “Storing calibration constants” on page 46). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 54: Capacitance Zero Calibration

    Step Succeeded” message indicates success; if the display shows “Calibration Step Failed”, check the input value, range, function, and entered calibration value, and repeat the calibration step. 8 Store the new capacitance zero calibration constants (see “Storing calibration constants” on page 46). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 55: Gain Adjustment

    Calibration Procedures Gain Adjustment The DAQ970A/DAQ973A 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.

  • Page 56: Valid Gain Adjustment Input Values

    6 Enter the calibration value per the applied input voltage in step 5 and press Perform Cal Step to begin the adjustment procedure (see “Entering calibration values” on page 46). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 57: Ac Voltage Gain And Flatness Calibration

    7 A “Calibration Step Succeeded” message indicates success; if the display shows “Calibration Step Failed”, check the input value, range, function, and entered calibration value, and repeat the calibration step. 8 Repeat step 5 to step 7 for each frequency in the following table. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 58: Ac Current Gain And Flatness Calibration

    6 Enter the calibration value per the applied input current in step 5 and press Perform Cal Step to begin the adjustment procedure (see “Entering calibration values” on page 46). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 59: Frequency Accuracy Calibration

    Channel Monitor on the selected channel before each test (see “Channel monitor” on page 50). 5 Apply the input signal per the input column in Table 2-4 and allow for appropriate source settling. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 60: Dc Voltage Gain Calibration (~10 V)

    6 Enter the calibration value per the applied input current in step 5 and press Perform Cal Step to begin the adjustment procedure (see “Entering calibration values” on page 46). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 61: Ohms Gain Calibration (2-Wire And 4-Wire)

    6 Enter the calibration value per the applied input current in step 5 and press Perform Cal Step to begin the adjustment procedure (see “Entering calibration values” on page 46). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 62: Dc Current Gain Calibration

    38. 4 Select Channel 321 and configure the function in the order shown in the table below and enable Channel Monitor on the selected channel before each test (see “Channel monitor” on page 50). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 63: Dc High Voltage Gain Calibration (¡100 V)

    38. 4 Select Channel 302 and configure the function in the order shown in the table below and enable Channel Monitor on the selected channel before each test (see “Channel monitor” on page 50). Keysight DAQ970A/DAQ973A Service Guide...
  • Page 64 9 Store the new gain calibration constants (see “Storing calibration constants” on page 46). Table 2-8 DC high voltage gain calibration (¡100 V) Input Channel 302 Voltage Function Range NPLC 100 V 100 V DC voltage 221 V 300 V Keysight DAQ970A/DAQ973A Service Guide...

  • Page 65: 3 Performance Verification

    Keysight DAQ970A/DAQ973A Data Acquisition System Service Guide Performance Verification Quick Performance Check Performance Verification Tests Internal DMM Verification Tests Zero Offset Verification Gain Verification Plug-in Module Test Considerations Relay Verification DAQM907A Analog Output Verification (Optional) DAQM907A Analog Sense Inputs Verification (Optional)

  • Page 66: Performance Verification

    This test does not check for abnormal component failures. To perform the quick performance check, do the following: – Perform a self-test (see page 23). – Perform only the performance verification tests indicated with the letter Q. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 67: Performance Verification Tests

    – Optional verification tests: Tests not performed with every calibration. Perform these tests to verify additional specifications or functions of the instrument. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 68: Internal Dmm Verification Tests

    ±6 μV ±6 μV Short DC voltage 10 V ±30 μV ±40 μV ±40 μV ±40 μV 100 V ±600 μV ±600 μV ±600 μV ±600 μV 300 V ±6 mV ±6 mV ±6 mV ±6 mV Keysight DAQ970A/DAQ973A Service Guide...
  • Page 69 10 μA ±50 pA ±50 pA ±50 pA ±50 pA 1 μA [a] Q: Quick performance verification test points. [b] For Channel 321, select NPLC 10. [c] These ranges are typical performances and are calibrated internally. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 70: Gain Verification

    (see “Channel monitor” on page 50). 4 Apply the input values and allow for appropriate source settling and compare the measurement results to the appropriate test limits. 5 Repeat step 4 for each gain verification item. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 71 300 V ±12 mV ±16.5 mV ±18 mV ±22.5 mV 300 V –300 V ±12 mV ±16.5 mV ±18 mV ±22.5 mV [a] Q: Quick performance verification test points. [b] For Channel 302, select NPLC 10. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 72 10 mA ±2.7 μA ±5 μA ±7 μA ±8 μA 1 mA 1 mA ±100 nA ±350 nA ±550 nA ±650 nA [a] Q: Quick performance verification test points. [b] For Channel 321, select NPLC 10. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 73 Enable Channel Monitor on the selected channel before each test (see “Channel monitor” on page 50). 4 Apply the input values and allow for appropriate source settling and compare the measurement results to the appropriate test limits. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 74 >200 Hz ±375 mV ±396 mV ±417 mV ±438 mV 70 V 300 kHz ±1.6 V ±1.6 V ±1.6 V ±1.6 V [a] Q: Quick performance verification test points. [b] For Channel 302, select bandwidth AC filter. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 75 ±130 nA ±140 nA ±140 nA 100 μA 100 μA >200 Hz 5 kHz ±110 nA ±130 nA ±140 nA ±140 nA [a] Q: Quick performance verification test points. [b] For Channel 321, select bandwidth AC filter. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 76: Plug-In Module Test Considerations

    CAUTION WITH MULTIPLE SIGNALS WARNING To avoid the possibility of multiple signal sources becoming connected together, we recommend when multiplexing two or more sources they should be connected on separate modules or on separate banks of the same module. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 77 ENVIRONMENTAL HEALTH & SAFETY WARNING When any channel is connected to a hazardous voltage source, the instrument and the device under test should be supervised, following local EHS practices to restrict access. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 78: Relay Verification

    DAQM900A solid state relay on-resistance verification (optional) This procedure checks the relay contact resistance for relays used in Channel 01 to 20 on the DAQM900A. It uses the internal DMM of the DAQ970A/DAQ973A to make resistance measurements. To ensure accurate measurements, the DAQ970A/DAQ973A has to be calibrated prior to this procedure.

  • Page 79: Daqm901A Relay Contact Resistance Verification (Optional)

    DAQM901A relay contact resistance verification (optional) This procedure checks the relay contact resistance for the relays used in Channel 01 to 20 on the DAQM901A. It uses the internal DMM of the DAQ970A/DAQ973A to make resistance measurements. To ensure accurate measurements, the DAQ970A/DAQ973A has to be calibrated prior to this procedure.
  • Page 80 This will be the sum of the K522 and K523 resistances. Ensure that the resistance is less than 2 W. 4 Short H to L for Channel 22. Plug the module back into the DAQ970A/ DAQ973A mainframe. 5 Set Channel 22 to measure DCI or ACI. Press [Monitor].

  • Page 81: Daqm901A Shorted Relay Contact Verification

    AMPS COM H to CH22 H. Ensure that they are “open” or more than 10 MW. Repeat for L terminals. 6 Plug the module back into the DAQ970A/DAQ973A mainframe. Set Channel 22 to measure DCI or ACI. Press [Monitor].

  • Page 82: Daqm902A Relay Contact Resistance Verification (Optional)

    DAQM902A relay contact resistance verification (optional) This procedure checks the relay contact resistance for relays used in Channel 01 to 16 on the DAQM902A. It uses the internal DMM of the DAQ970A/DAQ973A to make resistance measurements. To ensure accurate measurements, the DAQ970A/DAQ973A has to be calibrated prior to this procedure.

  • Page 83: Daqm902A Shorted Relay Contact Verification

    2-wire ohms measurement with handheld test probes is sufficient. 1 Remove the module from the DAQ970A/DAQ973A mainframe. You do not need to perform a Card Reset to open all channels as the relays will automatically open once the module is removed from the mainframe.

  • Page 84: Daqm903A Shorted Relay Contact Verification

    1 Install the DAQM903A module in slot 100. Close Channels 01 through 20. Remove the module from the DAQ970A/DAQ973A. 2 Measure the resistance from the CM terminal to the NC terminal on each channel. Ensure that they are “open” or more than 10 MΩ.

  • Page 85: Daqm904A Relay Contact Resistance Verification (Optional)

    NOTE route your wiring for proper strain relief and install the module cover. Install the DAQM904A in slot 200 of the DAQ970A/DAQ973A. 2 Open all channels on the module by performing a Card Reset (press [Module] select Card Reset; then press Yes to confirm).
  • Page 86 K201 Channel 22 ____________ W 2.00 W K202 Channel 23 ____________ W 2.00 W K203 Channel 24 ____________ W 2.00 W K204 Channel 25 ____________ W 2.00 W K205 Channel 26 ____________ W 2.00 W K206 Keysight DAQ970A/DAQ973A Service Guide...
  • Page 87 [a] Only the channel currently under test should be closed at one time. All other channels should be open. 10 Move the HI, LO, Sense HI, and Sense LO leads to ROW4. 11 Open all channels on the module by performing a Card Reset (press [Module] select Card Reset; then press Yes to confirm). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 88: Daqm904A Shorted Relay Contact Verification

    3 Measure the resistance from row 1 H terminal to all eight column’s H terminals. Ensure that they are “open” or more than 10 MW. Repeat this step for all the other three rows. 4 Repeat step 3 for L terminals. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 89: Daqm905A Relay Verification (Optional)

    Replace the module if the relay contact resistance if less than 10 MΩ. 8 Repeat steps 4 and 7 for Channels 12, 13, and 14. 9 Repeat steps 2, 3, 4, 5, 6, 7, and 8 for the channels connected to COM2. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 90: Daqm908A Relay Contact Resistance Verification (Optional)

    DAQM908A relay contact resistance verification (optional) This procedure checks the relay contact resistance for relays used in Channel 01 to 40 on the DAQM908A. It uses the internal DMM of the DAQ970A/DAQ973A to make resistance measurements. To ensure accurate measurements, the DAQ970A/DAQ973A has to be calibrated prior to this procedure.
  • Page 91 Performance Verification 6 Measure the resistance from the Common H terminal to CH22 terminals. Ensure that they are “open” or more than 10 MW. Keysight DAQ970A/DAQ973A Service Guide...

  • Page 92: Daqm907A Analog Output Verification (Optional)

    05) on the DAQM907A. Perform the module auto-calibration before starting this test. When performing module auto-calibration, the analog outputs and sense inputs will be calibrated to the DMM in the DAQ970A/DAQ973A. 1 Make connections to the analog output channels (Channel 04 and 05) as shown below using either an external DMM or a DAQM901A module inserted into an unused slot in the same DAQ970A/DAQ973A mainframe.

  • Page 93: Daqm907A Analog Sense Inputs Verification (Optional)

    Channel 07 output output result limits result limits – 10 V 20 mA 20 mA ± 0.0274 mA 10 V ± 7.1mV – 20 mA –10 V –10 V ± 7.1mV 20 mA ± 0.0274 mA Keysight DAQ970A/DAQ973A Service Guide...

  • Page 94: Thermocouple Reference Junction Verification (Optional)

    (or use the command from the ROUTe:MON remote interface). 6 Subtract the thermocouple error from the displayed temperature. Verify the result is within ±1.0 °C of the known temperature (set in step 4). Keysight DAQ970A/DAQ973A Service Guide...

  • Page 95: Daqm909A Dc/Ac Coupling Verification (Optional)

    2 Perform Full Self-Test using either methods below: – Front panel operation: Press [Utility] > Self Test > Full Test – Remote interface operation: “TEST:ALL?” Refer to “Full self-test” on page 24, or “TEST:ALL?” in the DAQ970A/DAQ973A NOTE Programming Guide for more details. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 96 3 Perform Autocalibration using either methods below: – Front panel operation: Press [Utility] > Autocal > Perform Autocal – Remote interface operation: “*CAL?” or “SYSTem:ACALibration? {<slot>|DMM|ALL}” Refer to “*CAL?” in the DAQ970A/DAQ973A Programming Guide for more NOTE details. 4 Apply the following settings at Channel 101: Press the [Channel] key to enter the [Channel] menu ii Press Measure >...
  • Page 97 ±0.6 mV. 12 Press [Interval] > Trigger Settings > Source > Auto > Done to change the Trigger Source of Channel 101 to Auto. 13 Repeat steps 7 to 12 for Channels 102 through 104. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 98 Performance Verification THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight DAQ970A/DAQ973A Service Guide...
  • Page 99 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2019 Edition 2, September 1, 2019 Printed in Malaysia *DAQ97-90001* DAQ97-90001 www.keysight.com...

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