National Instruments FlexDMM PXI-4072 Calibration Procedure
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National Instruments FlexDMM PXI-4072 Calibration Procedure

National Instruments FlexDMM PXI-4072 Calibration Procedure

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CALIBRATION PROCEDURE
NI 4070/4072 6½-Digit FlexDMM
Contents
This document contains step-by-step instructions for writing an external
calibration procedure for the National Instruments PXI/PCI-4070 and
NI PXI-4072 digital multimeters (DMMs). Each of these
National Instruments DMMs is a 6½-digit FlexDMM and 1.8 MS/s
isolated digitizer. For more information on calibration, visit
.
calibration
Conventions ............................................................................................ 2
Software Requirements ........................................................................... 2
Documentation Requirements................................................................. 3
Calibration Function Reference ....................................................... 3
Password ................................................................................................. 3
Calibration Interval ................................................................................. 3
Test Equipment ....................................................................................... 4
Test Conditions ....................................................................................... 5
Calibration Procedures ............................................................................ 6
Initial Setup...................................................................................... 6
Verification Procedures ................................................................... 7
Adjustment Procedures .................................................................... 39
Verification Limits.................................................................................. 58
DC Voltage ...................................................................................... 58
AC Voltage ...................................................................................... 59
4-Wire Resistance ............................................................................ 60
2-Wire Resistance ............................................................................ 61
DC Current....................................................................................... 61
AC Current....................................................................................... 62
Frequency......................................................................................... 62
Capacitance and Inductance............................................................. 63
Appendix A: Calibration Options ........................................................... 64
Where to Go for Support......................................................................... 68
™
ni.com/

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  • Page 1: Table Of Contents

    This document contains step-by-step instructions for writing an external calibration procedure for the National Instruments PXI/PCI-4070 and NI PXI-4072 digital multimeters (DMMs). Each of these National Instruments DMMs is a 6½-digit FlexDMM and 1.8 MS/s isolated digitizer. For more information on calibration, visit ni.com/...

  • Page 2: Conventions

    Conventions The following conventions are used in this document: » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence Options»Settings»General directs you to pull down the Options menu, select the Settings item, and select General from the last dialog box.

  • Page 3: Documentation Requirements

    In addition to this calibration document, you may find the following references helpful in writing your calibration utility. All of these documents are installed on your computer when you install NI-DMM. To locate them, select Start»All Programs»National Instruments» NI-DMM»Documentation. •...

  • Page 4: Test Equipment

    Insulated low thermal electromotive force Two Pomona 2305 lugs (EMF) spade lugs Chassis National Instruments PXI chassis and controller A device capable of generating pulse trains at NI PXI-6608 counter/timer module or the frequencies listed in Table 23 Agilent 33250a function/arbitrary waveform...

  • Page 5: Test Conditions

    NI 4070/4072. The suggested time periods are stated where necessary throughout this document. • Keep a shorting bar connected between the V GUARD and GROUND binding posts of the calibrator at all times. © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 6: Calibration Procedures

    • Clean any oxidation from the banana plugs on the Fluke 5440 cables before plugging them into the binding posts of the calibrator or the banana plug connectors of the NI 4070/4072. Oxidation tarnishes the copper banana plugs so that they appear dull rather than shiny and leads to greater thermal EMF.

  • Page 7: Verification Procedures

    To verify DC voltage of the NI 4070/4072, complete the following steps: Plug in the insulated banana plug shorting bar across the HI and LO banana plug connectors on the NI 4070/4072. Wait one minute for the thermal EMF to stabilize. Call niDMM_reset © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 8: Nidmm_Setattributevireal64 With The Following Parameters

    Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_DC_VOLTS • Range = • Resolution = 1e–6 Set the input resistance of the NI 4070/4072 to >10 GΩ by calling with the following parameters: niDMM_SetAttributeViReal64 • Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM Call...

  • Page 9: Function

    NI 4070/4072, and fasten the connectors on the other end of the cable to the appropriate calibrator binding posts. Figure 1 shows the correct connections. Table 2 lists the cable connections. © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 10: 26. Set The Input Resistance Of The Ni 4070/4072 To >10 Gω By Calling

    6ｽ-Digit FlexDMM OUTPUT SENSE VΩA VΩ INPUT 300V 1A, 250V AMPS 300V SENSE W 4W GUARD GROUND CURRENT CAT II 1 NI 4070/4072 2 Fluke 5700A/5720A Calibrator 3 Fluke 5440 Cable Figure 1. Cable Connections for Voltage and 2-Wire Resistance Table 2.

  • Page 11: Attribute_Value = Nidmm_Val_10_Megaohm

    This range prevents a 50 Ω calibrator output resistance from creating a voltage divider with the internal resistance of the NI 4070/4072. 33. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_DC_VOLTS • Range = • Resolution = 100e–9 © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 12: 34. Set The Input Resistance Of The Ni 4070/4072 To >10 Gω By Calling

    34. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling with the following parameters: niDMM_SetAttributeViReal64 • Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM 35. Call . Subtract the previously stored 100 mV >10 GΩ niDMM_Read mode offset from this measurement, and verify that the result falls between the limits listed in Table 17.
  • Page 13 56. Set the input resistance of the NI 4070/4072 to >10 GΩ by calling with the following parameters: niDMM_SetAttributeViReal64 • Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM 57. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 17. © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 14: Call Nidmm_Read . Verify That This Measurement Falls Between The

    58. Set the input resistance of the NI 4070/4072 to 10 MΩ by calling with the following parameters: niDMM_SetAttributeViReal64 • Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_10_MEGAOHM 59. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 17. 60.

  • Page 15: Call Nidmm_Read . Verify That This Measurement Falls Between The Limits Listed In Table

    Figure 1 shows the correct connections. Table 2 lists the cable connections. Output 5 mV at 1 kHz on the calibrator. Call to reset the NI 4070/4072 to a known state. niDMM_reset © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 16 Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_AC_VOLTS • Range = 0.05 • Resolution = 50e–9 Call ith the following niDMM_ConfigureAutoZeroMode w parameters: • Auto Zero Mode = NIDMM_VAL_AUTO_ZERO_ON Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 18.
  • Page 17 On the calibrator, output the value listed in the Calibrator Output column in Table 4 for the current iteration. Call with Mode set to niDMM_ConfigureMeasurement and the remaining parameters as shown NIDMM_VAL_AC_VOLTS in Table 4 for the current iteration. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 18 Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 18. Call again, changing Mode to niDMM_ConfigureMeasurement NIDMM_VAL_AC_VOLTS_DCCOUPLED Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 18. Table 4. niDMM_ConfigureMeasurement Parameters Calibrator Output niDMM_ConfigureMeasurement Parameters Iteration...
  • Page 19 NIDMM_VAL_AC_VOLTS 5e–6 50 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5e–6 100 kHz NIDMM_VAL_AC_VOLTS 5e–6 100 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5e–6 300 kHz NIDMM_VAL_AC_VOLTS 5e–6 300 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 5e–6 23. Output 50 V at 30 Hz on the calibrator. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 20 24. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = • Resolution = 50e–6 25. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 18. 26. Refer to Table 6 for the appropriate calibrator outputs and parameter values as you complete the following steps: On the calibrator, output the value listed in the Calibrator Output column in Table 6 for the current iteration.
  • Page 21 NIDMM_VAL_AC_VOLTS 300e–6 219 V 1 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300e–6 NIDMM_VAL_AC_VOLTS 300e–6 219 V 20 kHz 219 V 20 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300e–6 219 V 50 kHz NIDMM_VAL_AC_VOLTS 300e–6 219 V 50 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300e–6 © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 22 Table 7. niDMM_ConfigureMeasurement Parameters (Continued) Calibrator Output niDMM_ConfigureMeasurement Parameters Iteration Amplitude Frequency Function Range Resolution NIDMM_VAL_AC_VOLTS 300e–6 219 V 100 kHz 219 V 100 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300e–6 70 V 300 kHz NIDMM_VAL_AC_VOLTS 300e–6 70 V 300 kHz NIDMM_VAL_AC_VOLTS_DCCOUPLED 300e–6 32. Reset the calibrator for safety reasons. You have completed verifying the AC voltage of the NI 4070/4072.
  • Page 23 LO SENSE Black SENSE LO (No connection) Blue V GUARD Wait two minutes for the thermal EMF to stabilize if the Fluke 5440 cables were not previously connected in this configuration. Call niDMM_reset © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 24 Refer to Table 9 for the appropriate calibrator output and function parameter values as you complete the following steps: On the calibrator, output the value listed in the Calibrator Output column in Table 9 for the current iteration. Make sure that the external sense is turned on but 2-wire compensation is turned off.
  • Page 25 Function = NIDMM_VAL_2_WIRE_RES • Range = • Resolution = 1e–3 Call with OffsetCompOhms niDMM_ConfigureOffsetCompOhms set to NIDMM_VAL_OFFSET_COMP_OHMS_ON Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 20. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 26 10. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = • Resolution = 100e–6 11. Call with OffsetCompOhms niDMM_ConfigureOffsetCompOhms set to NIDMM_VAL_OFFSET_COMP_OHMS_ON 12. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 20. 13.
  • Page 27 29. Connect the NI 4070/4072 and the Fluke 5700A/5720A calibrator using two sets of Fluke 5440 cables, a double banana plug, and two insulated, low EMF spade lugs, as shown in Figure 3. Table 10 lists the cable connections. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 28 NI PXI-407x -Digit FlexDMM 5700A/5720A HI / LO SENSE 1 kV INPUT 5440 Cables 3A, 250V AMPS 5700A/5720A HI / LO 300V 5440 Cables 500V MA X CAT I Figure 3. Cable Connections for 2-Wire Resistance Table 10. Fluke 5440 Cable Connections Banana Plug Connector Banana Plug Color Binding Post Label...
  • Page 29 Completing the Adjustment Procedures section. • If you do not want to verify any additional modes and you are performing a pre-adjustment verification, call to close niDMM_close the session. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 30 Verifying DC Current To verify the DC current of the NI 4070/4072, complete the following steps: Reset the calibrator. Fasten the connectors on one end of the Fluke 5440 cable to the NI 4070/4072 HI SENSE and LO banana plug connectors, and connect the connectors on the other end of the cable to the HI and LO calibrator binding posts.
  • Page 31 Table 21. 15. Output –20 mA on the calibrator. 16. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 21. 17. Output 200 mA on the calibrator. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 32 18. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_DC_CURRENT • Range = • Resolution = 200e–9 19. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 21. 20. Output –200 mA on the calibrator. 21.
  • Page 33 Table 22. 13. Output 100 mA at 1 kHz on the calibrator. 14. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 22. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 34 15. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_AC_CURRENT • Range = • Resolution = 1e–6 16. Call . Verify that this measurement falls between the niDMM_Read limits listed in Table 22. 17. Output 1 A at 1 kHz on the calibrator. 18.
  • Page 35 NI suggests using traceable capacitor standards with low thermal drift. You can use different verification capacitors to verify each capacitance range. You can verify two ranges with the same verification capacitor as long as © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 36 its value is ≥10% of the higher capacitor range. For example, you can use a 1 nF verification capacitor to test both the 10 nF and 1 nF ranges. After taking each measurement, verify that the measurement falls between the tolerances listed in Table 24. Tolerances are provided instead of absolute limits, because you can use capacitance verification values other than the values suggested, or the calibrated value may differ slightly from the nominal capacitance (for example, 272.43 pF instead of 270.00 pF).

  • Page 37: Attribute_Id = Attribute_Value

    If you use capacitance verification values that differ from the values listed in Table 12, verify that each measurement falls between the tolerances listed in Table 24. The tolerances shown in Table 24 correspond to the NI 4072 accuracy specifications. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 38 14. Remove the 270 pF verification capacitor, and plug the 1 nF verification capacitor into the HI and LO banana plug connectors of the NI 4072. 15. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_CAPACITANCE • Range = 1e-9 •...

  • Page 39: Adjustment Procedures

    For example, if Range = , the floating point value is . Refer to the NI Digital Multimeters Help for more information about parameter values. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 40 NI recommends repeating the verification procedures after you perform these Note adjustment procedures. Reverification ensures that the device you have calibrated is operating within specifications after adjustments. If you skip any of the steps within a section of the adjustment procedures, Caution NI-DMM does not allow you to store your new calibration coefficients.
  • Page 41 14. Plug in the insulated banana plug shorting bar across the HI and LO banana plug connectors of the NI 4070/4072. 15. Wait two minutes for the thermal EMF to stabilize. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 42 16. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_DC_VOLTS • Range = • Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM 17. Call with Type set to niDMM_CalAdjustMisc NIDMM_EXTCAL_MISCCAL_VREF 18. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_DC_VOLTS • Range = •...
  • Page 43 39. Call with the following parameters: niDMM_CalAdjustGain • Mode = NIDMM_VAL_4_WIRE_RES • Range = 10e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA Ω • Expected Value = the display on the calibrator for 0 © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 44 40. Output 10 MΩ on the calibrator with external sense turned on and 2-wire compensation turned off. 41. Call with the following parameters: niDMM_CalAdjustGain • Mode = NIDMM_VAL_4_WIRE_RES • Range = 10e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA Ω • Expected Value = the display on the calibrator for 10 M 42.
  • Page 45 61. Plug in the insulated shorting bar across the HI and LO banana plug connectors of the NI 4070/4072. 62. Wait two minutes for the thermal EMF to stabilize. © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 46 63. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_2_WIRE_RES • Range = 10e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 64. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_2_WIRE_RES • Range = • Input Resistance = NIDMM_VAL_RESISTANCE_NA 65. Call with the following parameters: niDMM_CalAdjustOffset •...
  • Page 47 Table 13 for the current iteration. Call with Mode set to niDMM_CalAdjustGain . Set the remaining parameters as shown NIDMM_VAL_AC_VOLTS in Table 13 for the current iteration. Call again, changing Mode to niDMM_CalAdjustGain NIDMM_VAL_AC_VOLTS_DCCOUPLED © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 48 Repeat step 3 for each of the remaining iterations listed in Table 13. Table 13. niDMM_CalAdjustGain Parameters Calibrator Output niDMM_CalAdjustGain Parameters Range Expected Iteration Amplitude (kHz) Mode Input Resistance Value NIDMM_VAL_AC_VOLTS 0.05 NIDMM_VAL_1_ME 50 mV 0.05 GAOHM 50 mV NIDMM_VAL_AC_VOLTS_ 0.05 NIDMM_VAL_1_ME 0.05...
  • Page 49 NIDMM_VAL_AC_VOLTS in Table 15 for the current iteration. Note The Session parameter remains the same for all instances of this function. Call again, changing Mode to niDMM_CalAdjustACFilter NIDMM_VAL_AC_VOLTS_DCCOUPLED © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 50 Repeat step 7 for each of the remaining iterations shown in Table 15. Table 15. niDMM_CalAdjustACFilter Parameters Calibrator Output niDMM_CalAdjustACFilter Parameters Frequency Range Frequency Iteration Amplitude (kHz) Mode (Hz) NIDMM_VAL_AC_VOLTS 0.05 50 mV 50 mV NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.05 50 mV NIDMM_VAL_AC_VOLTS 0.05 50 mV NIDMM_VAL_AC_VOLTS_DCCOUPLED...
  • Page 51 NIDMM_VAL_AC_VOLTS 500e3 NIDMM_VAL_AC_VOLTS_DCCOUPLED 500e3 NIDMM_VAL_AC_VOLTS 50 V 50 V NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 V NIDMM_VAL_AC_VOLTS 50 V NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 V NIDMM_VAL_AC_VOLTS 20e3 50 V NIDMM_VAL_AC_VOLTS_DCCOUPLED 20e3 50 V NIDMM_VAL_AC_VOLTS 50e3 50 V NIDMM_VAL_AC_VOLTS_DCCOUPLED 50e3 © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 52 Table 15. niDMM_CalAdjustACFilter Parameters (Continued) Calibrator Output niDMM_CalAdjustACFilter Parameters Frequency Range Frequency Iteration Amplitude (kHz) Mode (Hz) NIDMM_VAL_AC_VOLTS 100e3 50 V 50 V NIDMM_VAL_AC_VOLTS_DCCOUPLED 100e3 50 V NIDMM_VAL_AC_VOLTS 200e3 50 V NIDMM_VAL_AC_VOLTS_DCCOUPLED 200e3 50 V NIDMM_VAL_AC_VOLTS 300e3 NIDMM_VAL_AC_VOLTS_DCCOUPLED 300e3 50 V 10 V NIDMM_VAL_AC_VOLTS 500e3...
  • Page 53 HI and LO calibrator binding posts. Figure 4 shows the correct connections. Table 11 lists the cable connections. Call with the following niDMM_ConfigureMeasurement parameters: • Function = NIDMM_VAL_DC_CURRENT • Range = 0.02 © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 54 Call to configure the NI 4070/4072 for a current mode niDMM_Read before applying current. Output 20 mA on the calibrator with the current output set to NORM Call with the following parameters: niDMM_CalAdjustGain • Mode = NIDMM_VAL_DC_CURRENT • Range = 0.02 •...
  • Page 55 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 25. Call with the following parameters: niDMM_CalAdjustOffset • Mode = NIDMM_VAL_AC_CURRENT • Range = • Input Resistance = NIDMM_VAL_RESISTANCE_NA 26. Call with Type set to niDMM_CalAdjustMisc NIDMM_EXTCAL_MISCCAL_SECTION © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 56 You have completed adjusting the current modes of the NI 4070/4072. Select one of the following options: • If you are calibrating an NI 4070, refer to one of the following sections: – Verification Procedures—to verify your new calibration coefficients before saving them to the EEPROM –...
  • Page 57 EEPROM. Otherwise, • Action = if the results of the NIDMM_EXTCAL_ACTION_ABORT calibration were unsatisfactory and you want to restore the original calibration coefficients to the EEPROM. © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 58: Verification Limits

    Verification Limits This section includes the verification limits for DC voltage, AC voltage, 4-wire resistance, 2-wire resistance, DC current, AC current, and frequency for the NI 4070/4072, and the verification tolerances for capacitance on the NI 4072. Compare these limits to the results you obtain in the Verification Procedures section.

  • Page 59: Ac Voltage

    4.974 V 5.026 V 300 kHz AC/DC 4.8475 V 5.1525 V 50 V 30 Hz 50 V 49.945 V 50.055 V 50 V 50 Hz 50 V AC/DC 49.965 V 50.035 V © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 60: 4-Wire Resistance

    Table 18. NI 4070/4072 AC Voltage Verification Limits (Continued) Calibrator Output 2-Year Limits Amplitude Frequency Range Coupling Lower Upper 50 V 1 kHz 50 V AC/DC 49.965 V 50.035 V 50 V 20 kHz 50 V AC/DC 49.965 V 50.035 V 50 V 50 kHz 50 V...

  • Page 61: 2-Wire Resistance

    DC Current Table 21. NI 4070/4072 DC Current Verification Limits 2-Year Limits Calibrator Amplitude Range Lower Upper –3 μA 3 μA 20 mA –4 μA 4 μA 200 mA –50 μA 50 μA © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 62: Ac Current

    Table 21. NI 4070/4072 DC Current Verification Limits (Continued) 2-Year Limits Calibrator Amplitude Range Lower Upper 20 mA 20 mA 19.989 mA 20.011 mA –20 mA 20 mA –20.011 mA –19.989 mA 200 mA 200 mA 199.916 mA 200.084 mA –200 mA 200 mA –200.084 mA...

  • Page 63: Capacitance And Inductance

    ±0.15 ±0.1 1 μF 100 nF ±0.18 ±0.1 10 μF 10 μF ±0.18 ±0.1 10 μF 100 μF ±0.18 ±0.1 1,000 μF 1,000 μF ±0.18 ±0.1 1,000 μF 10,000 μF ±0.18 ±0.1 © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 64: Appendix A: Calibration Options

    Appendix A: Calibration Options The complete calibration process for the NI 4070/4072 consists of verifying, adjusting, and reverifying a device. During verification, you compare the measured performance to an external standard of known measurement uncertainty to confirm that the product meets or exceeds specifications.
  • Page 65 Table 25. Summary of Adjustment Options Adjustment Optional Required DC Voltage — Resistance — AC Voltage — AC/DC Current — Inductance and Capacitance — (NI 4072 only) © National Instruments Corporation NI 4070/4072 Calibration Procedure...
  • Page 66 Verify Go to Go to Verifying DC Voltage Initial Setup DC Voltage Mode? Verify Go to Verifying AC Voltage AC Voltage Mode? Verify Go to Verifying 4-Wire Resistance 4-Wire Resistance Mode? Verify Go to Verifying 2-Wire Resistance 2-Wire Resistance Mode? Verify Go to Verifying DC Current...
  • Page 67 Current Modes? Go to Adjusting Current Modes Go to Adjusting Capacitance and Inductance Perform Go to Post-Adjustment Verification Verification? Procedures Flowchart Go to Completing the Adjustment Procedures Figure 6. Adjustment Procedures Flowchart © National Instruments Corporation NI 4070/4072 Calibration Procedure...

  • Page 68: Where To Go For Support

    CVI, LabVIEW, National Instruments, NI, ni.com, the National Instruments corporate logo, and the Eagle logo are trademarks of National Instruments Corporation. Refer to the Trademark Information at ni.com/trademarks for other National Instruments trademarks. The mark LabWindows is used under a license from Microsoft Corporation.

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