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NI PXIe-4081 Calibration Manual

Pxie, 7 1/2-digit, +-1,000 v, onboard 1.8 ms/s isolated digitizer, pxi digital multimeter
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CALIBRATION PROCEDURE
PXIe-4081
PXIe, 7½-Digit, ±1,000 V, Onboard 1.8 MS/s Isolated Digitizer, PXI
Digital Multimeter
This document contains the verification and adjustment procedures for the PXIe-4081. Refer
to
ni.com/calibration
Contents
Required Software.....................................................................................................................1
Related Documentation.............................................................................................................2
Password................................................................................................................................... 2
Calibration Interval................................................................................................................... 2
Test Equipment..........................................................................................................................2
Calibration Procedures.............................................................................................................. 3
Initial Setup............................................................................................................................... 3
Test Conditions..........................................................................................................................4
As-Found and As-Left Limits................................................................................................... 4
Verification................................................................................................................................5
Verifying DC Voltage........................................................................................................5
Verifying AC Voltage........................................................................................................7
Verifying 4-Wire Resistance............................................................................................. 9
Verifying 2-Wire Resistance........................................................................................... 11
Verifying DC Current......................................................................................................14
Verifying AC Current......................................................................................................17
Adjustment.............................................................................................................................. 19
Adjusting DC Voltage..................................................................................................... 19
Adjusting Resistance.......................................................................................................20
Adjusting AC Voltages....................................................................................................23
Adjusting Current............................................................................................................25
Completing the Adjustment Procedures......................................................................... 27
Reverification..........................................................................................................................27
Worldwide Support and Services............................................................................................ 28

Required Software

Calibrating the PXIe-4081 requires you to install the following software on the calibration
system:
•
NI-DMM version 15.2 or later
for more information about calibration solutions.

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  • Page 1: Table Of Contents

    Adjusting Resistance.......................20 Adjusting AC Voltages....................23 Adjusting Current......................25 Completing the Adjustment Procedures................. 27 Reverification..........................27 Worldwide Support and Services.................... 28 Required Software Calibrating the PXIe-4081 requires you to install the following software on the calibration system: • NI-DMM version 15.2 or later...

  • Page 2: Related Documentation

    You can download all required software from ni.com/downloads. Related Documentation For additional information, refer to the following documents as you perform the calibration procedure: • NI Digital Multimeters Help • NI PXIe-4080/4081/4082 Getting Started Guide • NI PXIe-4081 Specifications Visit ni.com/manuals...

  • Page 3: Calibration Procedures

    Initial Setup Note Ensure that both the calibrator and the PXIe-4081 are warmed up for at least 60 minutes before you begin this procedure. To set up the test equipment, complete the following steps: Remove all connections from the four inputs on the PXIe-4081.

  • Page 4: Test Conditions

    Plug the PXI Express chassis and the calibrator into the same power strip to avoid ground loops. • Power on and warm up both the calibrator and the PXIe-4081 for at least 60 minutes before beginning this calibration procedure. •...

  • Page 5: Verification

    Plug in the shorting bar between the HI and LO terminals of the PXIe-4081. Wait two minutes for thermal EMF to stabilize. Reset the PXIe-4081. Initialize the PXIe-4081 for DC voltage with a range of 100 mV and resolution of 7.5 digits. Verify the accuracy for each configuration in the following table: Acquire the measurement at each specified range and input resistance.
  • Page 6 V-GUARD Wait two minutes for thermal EMF to stabilize. 10. Set the PXIe-4081 and Calibrator configuration as shown in the following table. 11. Acquire the specified measurements and record them for use as the offset nulls in the following steps.

  • Page 7: Verifying Ac Voltage

    -1000 V -1000.0353 -999.9647 -1000.0189 -999.9811 You have completed verifying the DC voltage mode of the PXIe-4081. Select one of the following options: • If you want to continue verifying other modes, go to the Verifying AC Voltage section. •...
  • Page 8 AC / DC 50 Hz 4.99725 5.00275 1 kHz 4.99725 5.00275 50 V 1 kHz 4.992 5.008 20 kHz 4.99725 5.00275 50 kHz 4.9965 5.0035 100 kHz 4.9895 5.0105 300 Hz 4.9575 5.0425 8 | ni.com | PXIe-4081 Calibration Procedure...

  • Page 9: Verifying 4-Wire Resistance

    220.664 70 V 300 kHz 66.85 73.15 You have completed verifying the AC voltage mode of the PXIe-4081. Select one of the following options: • If you want to continue verifying other modes, proceed to the Verifying 4-Wire Resistance section.
  • Page 10 CURRENT Wait two minutes for thermal EMF to stabilize. Reset the PXIe-4081. Configure the PXIe-4081 for 4-wire resistance measurements with a resolution of 7.5 digits. Verify the accuracy for each configuration in the following table: Acquire the measurement at each specified configuration.

  • Page 11: Verifying 2-Wire Resistance

    Note Apply an offset null to the 100 kΩ measurement by subtracting the corresponding 0 Ω measurement in the 100 kΩ range. You have completed verifying the 4-wire resistance mode of the PXIe-4081. Select one of the following options: •...
  • Page 12 For the 1 MΩ and 100 kΩ measurements, subtract the corresponding 0 Ω measurement as an offset null. 10. Connect the PXIe-4081 to the calibrator using low thermal EMF cables according to the 2-wire compensated configuration shown in the following figure.
  • Page 13 100 Ω Off 100 Ω 2-Wire 2012 2005 You have completed verifying the 2-wire resistance mode of the PXIe-4081. Select one of the following options: • If you want to continue verifying other modes, go to the Verifying DC Current section. •...

  • Page 14: Verifying Dc Current

    Complete the following steps to verify DC current: Unplug all cables from the PXIe-4081. Reset the PXIe-4081. Initialize the PXIe-4081 for DC current with a range of 1 µA and a resolution of 6.5 digits. Verify the accuracy for each configuration in the following table: Acquire the measurement at each specified range.
  • Page 15 Guard Verify the accuracy for each configuration in the following table: Set the PXIe-4081 and the ammeter to the listed configuration and commit. Configure the ammeter for a single acquisition. Set the Calibrator to the listed configuration and allow it to settle.
  • Page 16 100 µA -90 µA 1 mA 0.9 mA 1 mA -0.9 mA Connect the PXIe-4081 to the calibrator using low leakage cables according to the configuration shown in the following figure. Figure 5. DC Current Connection Configuration OUTPUT SENSE NI DMM...

  • Page 17: Verifying Ac Current

    Connect the PXIe-4081 to the calibrator using low leakage cables according to the configuration shown in Figure 5. on page 16. Reset the PXIe-4081. Initialize the PXIe-4081 for AC current with a range of 100 µA and resolution of 6.5 digits. PXIe-4081 Calibration Procedure | © National Instruments | 17...
  • Page 18 0.30084 A 2.2 A 1 kHz 2.19764 A 2.20236 A You have completed verifying AC current for the PXIe-4081. Select one of the following options: • If you are performing a pre-adjustment verification, close the session. • To update the verification time stamp, complete the following steps: Open a new calibration session to the instrument (with correct calibration password).

  • Page 19: Adjustment

    Disconnect the cables from the PXIe-4081, leaving the other end of the cable connected to the calibrator binding posts. Plug in the banana shorting bar across the HI and LO terminals on the PXIe-4081. 10. Wait two minutes for thermal EMF to stabilize.

  • Page 20: Adjusting Resistance

    Function: DC Volts • Range: 100 mV • Input Resistance: >10 GΩ You have completed adjusting the DC voltage mode of the PXIe-4081. Proceed to one of the following sections: • Adjusting Resistance • Adjusting AC Voltage • Adjusting Current If you are not performing additional adjustments, proceed to the Completing the Adjustment Procedures section to commit the calibration constants.
  • Page 21 10 MΩ N/A (value 0 Ω None resistance from 10 MΩ 10 s calibrator) Call the niDMM Cal Adjust Misc VI or the niDMM_CalAdjustMisc function with Type set to NIDMM_EXTCAL_MISCCAL_RREF Self-calibrate the PXIe-4081. PXIe-4081 Calibration Procedure | © National Instruments | 21...
  • Page 22 11. Call the niDMM Cal Adjust Misc VI or the niDMM_CalAdjustMisc function with Type set to NIDMM_EXTCAL_MISCCAL_VREF_RESISTANCE 12. Disconnect all inputs from the PXIe-4081 and plug in the shorting bar between the HI and LO terminals. 13. Wait two minutes for thermal EMF to stabilize.

  • Page 23: Adjusting Ac Voltages

    1 kΩ 10 kΩ 100 kΩ 1 MΩ 10 MΩ 100 MΩ You have completed adjusting the resistance of the PXIe-4081. Proceed to one of the following sections: • Adjusting AC Voltage • Adjusting Current If you are not performing additional adjustments, proceed to the Completing the Adjustment Procedures section to commit your calibration constants.
  • Page 24 1 kHz 5 kHz 20 kHz 50 kHz 100 kHz 200 kHz 300 kHz 500 kHz AC Volts 1 kHz 5 kHz 20 kHz 50 kHz 100 kHz 200 kHz 300 kHz 500 kHz 24 | ni.com | PXIe-4081 Calibration Procedure...

  • Page 25: Adjusting Current

    Call the niDMM_Cal Adjust Misc VI or the niDMM_CalAdjustMisc function with Type set to NIDMM_EXTCAL_MISCCAL_VOLTAGE_AC_FILTER Self-calibrate the PXIe-4081. You have completed adjusting the AC voltage modes of the PXIe-4081. Proceed to one of the following sections: • Adjusting Current If you are not performing additional adjustments, proceed to the Completing the Adjustment Procedures section to commit the calibration constants.
  • Page 26 DC current 1 µA DC current 10 µA Connect the PXIe-4081 to the calibrator with the ammeter in series as shown in Figure 4. on page 15. Adjust the current gain with each configuration in the following table: Commit the PXIe-4081 and ammeter to the specified range.

  • Page 27: Completing The Adjustment Procedures

    -0.5 A -0.5 A 10. Self-calibrate the PXIe-4081. You have completed adjusting the current modes of the PXIe-4081. Proceed to the Completing the Adjustment Procedures section. Completing the Adjustment Procedures To complete the adjustment procedure for the PXIe-4081 and close the session, call the...

  • Page 28: Worldwide Support And Services

    . You can find patents.txt ni.com/patents information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product. Refer to the Export Compliance Information at for the NI global trade compliance policy and how ni.com/legal/export-compliance...

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