National Instruments NI 4070/4072 6 1/2-Digit FlexDMM - Manual

Page 2 - Conventions; File»Page Setup»Options; Read Me First: Safety and Radio-Frequency; bold; italic; Software Requirements; Note

NI 4070/4072 Calibration Procedure 2 ni.com 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 File»Page Setup»Options directs you to pull down the File menu, select the Page Setup...

Page 3 - Documentation Requirements; Start»All Programs»National Instruments»; NI Digital Multimeters Help; TB-2715 Terminal Block Installation Guide; Calibration Function Reference; LabVIEW Reference; Start»; Password

© National Instruments Corporation 3 NI 4070/4072 Calibration Procedure The procedures in this document are described using C function calls. You also can program in LabVIEW using the VIs that correspond to the C function calls. Documentation Requirements In addition to this calibration document, yo...

Page 4 - Calibration Interval; Appendix A: Calibration; Test Equipment; Required Test Equipment; LO; Additional Requirements for the NI 4072

NI 4070/4072 Calibration Procedure 4 ni.com Calibration Interval The accuracy requirements of your measurement application determine how often you should calibrate the NI 4070/4072. NI recommends performing a complete calibration at least once every two years. NI does not guarantee the absolute accu...

Page 5 - Optional Test Equipment; Test Conditions; V GUARD

© National Instruments Corporation 5 NI 4070/4072 Calibration Procedure 300 pF range, a capacitor with values between 90 –100% of full scale should be used. NI suggests using the capacitance standards of the SCA Series from IET Labs. This calibration procedure assumes the use of 270 pF, 1 nF, 100 nF...

Page 6 - Calibration Procedures; Initial Setup

NI 4070/4072 Calibration Procedure 6 ni.com • 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 rathe...

Page 7 - Verification Procedures; Verifying AC Current

© National Instruments Corporation 7 NI 4070/4072 Calibration Procedure Fluke 5700A/5720A user documentation for instructions on calibrating these devices. Note Ensure that both the calibrator and the NI 4070/4072 (installed in a powered-on PXI chassis or PC) are warmed up for at least 60 minutes be...

Page 8 - Verifying DC Voltage

NI 4070/4072 Calibration Procedure 8 ni.com Verifying DC Voltage To verify DC voltage of the NI 4070/4072, complete the following steps: 1. Plug in the insulated banana plug shorting bar across the HI and LO banana plug connectors on the NI 4070/4072. 2. Wait one minute for the thermal EMF to stabil...

Page 10 - Wait two minutes for the thermal EMF to stabilize.; with the following; Function; by calling; with the following parameters:

NI 4070/4072 Calibration Procedure 10 ni.com Figure 1. Cable Connections for Voltage and 2-Wire Resistance 23. Wait two minutes for the thermal EMF to stabilize. 24. Generate 0 V on the calibrator. 25. Call niDMM_ConfigureMeasurement with the following parameters: • Function = NIDMM_VAL_DC_VOLTS • R...

Page 14 - Caution

NI 4070/4072 Calibration Procedure 14 ni.com 58. Set the input resistance of the NI 4070/4072 to 10 M Ω by calling niDMM_SetAttributeViReal64 with the following parameters: • Attribute_ID = NIDMM_ATTR_INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_10_MEGAOHM 59. Call niDMM_Read . Verify that this me...

Page 15 - Completing the Adjustment; Verifying AC Voltage

© National Instruments Corporation 15 NI 4070/4072 Calibration Procedure 71. Call niDMM_ConfigureMeasurement with the following parameters: • Function = NIDMM_VAL_DC_VOLTS • Range = 300 • Resolution = 300e–6 72. Call niDMM_Read . Before you apply the voltage, the DMM must be in the 300 V range. 73. ...

Page 16 - Calibrator Output

NI 4070/4072 Calibration Procedure 16 ni.com 5. Call niDMM_ConfigureMeasurement with the following parameters: • Function = NIDMM_VAL_AC_VOLTS • Range = 0.05 • Resolution = 50e–9 6. Call niDMM_Read . Verify that this measurement falls between the limits listed in Table 16. 7. Call niDMM_ConfigureMea...

Page 17 - Mode

© National Instruments Corporation 17 NI 4070/4072 Calibration Procedure 13. Repeat step 12 for each of the remaining iterations shown in Table 2. 14. Output 500 mV at 30 Hz on the calibrator. 15. Call niDMM_ConfigureMeasurement with the following parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLE...

Page 22 - Verifying 4-Wire Resistance

NI 4070/4072 Calibration Procedure 22 ni.com 31. Reset the calibrator for safety reasons. You have completed verifying the AC voltage of the NI 4070/4072. Select one of the following options: • If you want to continue verifying other modes, go to the Verifying 4-Wire Resistance section. • If you do ...

Page 23 - OffsetCompOhms

© National Instruments Corporation 23 NI 4070/4072 Calibration Procedure 3. Wait two minutes for the thermal EMF to stabilize if the Fluke 5440 cables were not previously connected in this configuration. 4. Call niDMM_reset . 5. Refer to Table 8 for the appropriate calibrator output and function par...

Page 24 - Verifying 2-Wire Resistance

NI 4070/4072 Calibration Procedure 24 ni.com 6. Repeat step 5 for each of the remaining iterations listed in Table 8. You have completed verifying the 4-wire resistance of the NI 4070/4072. Select one of the following options: • If you want to continue verifying other modes, go to the Verifying 2-Wi...

Page 30 - Verifying DC Current

NI 4070/4072 Calibration Procedure 30 ni.com 57. Call niDMM_Read . Subtract the previously calculated 100 Ω range offset from this measurement. Verify that the result falls between the tolerances listed in Table 18. You have completed verifying the 2-wire resistance of the NI 4070/4072. Select one o...

Page 32 - Verifying AC

NI 4070/4072 Calibration Procedure 32 ni.com 13. Output 20 mA on the calibrator. 14. Call niDMM_Read . Verify that this measurement falls between the limits listed in Table 19. 15. Output –20 mA on the calibrator. 16. Call niDMM_Read . Verify that this measurement falls between the limits listed in ...

Page 33 - HI SENSE

© National Instruments Corporation 33 NI 4070/4072 Calibration Procedure Verifying AC Current To verify the AC current of the NI 4070/4072, complete the following steps: 1. Reset the calibrator. 2. Fasten the connectors on one end of the Fluke 5440 cable to the NI 4070/4072 HI SENSE and LO banana pl...

Page 34 - Verifying Frequency; Notes

NI 4070/4072 Calibration Procedure 34 ni.com 14. Call niDMM_ConfigureMeasurement with the following parameters: • Function = NIDMM_VAL_AC_CURRENT • Range = 1 • Resolution = 1e–6 15. Call niDMM_Read . Verify that this measurement falls between the limits listed in Table 20. 16. Output 1 A at 1 kHz on...

Page 37 - Verifying Capacitance and Inductance (NI 4072 Only); Additional Requirements for

© National Instruments Corporation 37 NI 4070/4072 Calibration Procedure Verifying Capacitance and Inductance (NI 4072 Only) This verification procedure only applies to the NI 4072 and requires additional test equipment, as indicated in the Additional Requirements for the NI 4072 section. Note The N...

Page 41 - Adjustment Procedures; Range; Setting Up the Test Equipment

© National Instruments Corporation 41 NI 4070/4072 Calibration Procedure Adjustment Procedures This section explains how to adjust the NI 4070/4072. You can choose to perform these adjustment procedures with or without performing the verification procedures first. The parameters Range , Resolution ,...

Page 42 - Adjusting DC Voltage and Resistance

NI 4070/4072 Calibration Procedure 42 ni.com Adjusting DC Voltage and Resistance To adjust the DC voltage and resistance of the NI 4070/4072, complete the following steps: 1. Fasten the connectors on one end of the Fluke 5440 cable to the appropriate banana plug connectors on the NI 4070/4072, and f...

Page 43 - the display on the calibrator for 10 M

© National Instruments Corporation 43 NI 4070/4072 Calibration Procedure 10. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VAL_DC_VOLTS • Range = 10 • Input Resistance = NIDMM_VAL_GREATER_THAN_10_GIGAOHM • Expected Measurement = 10 11. Output –10 V on the calibrator. 12. Cal...

Page 45 - the display on the calibrator for 0; the display on the calibrator for 100 k

© National Instruments Corporation 45 NI 4070/4072 Calibration Procedure 36. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VAL_2_WIRE_RES • Range = 100e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA • Expected Value = the display on the calibrator for 0 Ω 37. Call niDMM_CalA...

Page 47 - Adjusting Current Modes

© National Instruments Corporation 47 NI 4070/4072 Calibration Procedure 58. Call niDMM_CalAdjustOffset with the following parameters: • Mode = NIDMM_VAL_2_WIRE_RES • Range = 1e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 59. Call niDMM_CalAdjustOffset with the following parameters: • Mode = NIDMM...

Page 50 - Session

NI 4070/4072 Calibration Procedure 50 ni.com 7. Refer to Table 13 for the appropriate calibrator outputs and parameter values as you complete the following steps: a. On the calibrator, output the value listed in the Calibrator Output column in Table 13 for the current iteration. b. Call niDMM_CalAdj...

Page 53 - Type; Adjusting Capacitance and Inductance (NI 4072 Only)

© National Instruments Corporation 53 NI 4070/4072 Calibration Procedure 9. Reset the calibrator for safety reasons. 10. Call niDMM_CalAdjustMisc with Type set to NIDMM_EXTCAL_MISCCAL_SECTION . You have completed adjusting the AC voltage modes of the NI 4070/4072. Select one of the following options...

Page 57 - must

© National Instruments Corporation 57 NI 4070/4072 Calibration Procedure ♦ If you are calibrating an NI 4072, you must complete this section to attain a valid calibration. Caution It is necessary to adjust DC voltage and resistance before running these adjustment steps. During this procedure, be sur...

Page 58 - Completing the Adjustment Procedures; Action; Verification Limits; Verification; DC Voltage

NI 4070/4072 Calibration Procedure 58 ni.com • To finish the calibration and close the session, go to the Completing the Adjustment Procedures section. Completing the Adjustment Procedures To complete the adjustment procedure for the NI 4070/4072 and close the session, call niDMM_CloseExtCal with th...

Page 59 - AC Voltage

© National Instruments Corporation 59 NI 4070/4072 Calibration Procedure AC Voltage –100 mV 100 mV >10 G Ω / 10 M Ω – 0.100006 V – 0.099994 V – 0.100002 V – 0.099998 V 1 V 1 V >10 G Ω / 10 M Ω 0.999969 V 1.000031 V 0.999992 V 1.000008 V –1 V 1 V >10 G Ω / 10 M Ω –1.000031 V – 0.999969 V –1....

Page 63 - Frequency

© National Instruments Corporation 63 NI 4070/4072 Calibration Procedure Frequency Capacitance and Inductance Note Because the actual capacitance verification values can differ from the following values, Table 22 provides tolerances that correspond to the NI 4072 accuracy specifications Table 21. Fr...

Page 64 - Appendix A: Calibration Options; Normally, the calibration sequence is as follows:

NI 4070/4072 Calibration Procedure 64 ni.com 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 uncert...

Page 65 - Adjustment

© National Instruments Corporation 65 NI 4070/4072 Calibration Procedure Table 23. Summary of Adjustment Options Adjustment Optional Required DC Voltage — Y Resistance — Y AC Voltage Y — AC/DC Current Y — Inductance and Capacitance(NI 4072 only) — Y

Page 68 - Where to Go for Support; you have access to everything from

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National Instruments NI 4070/4072 6 1/2-Digit FlexDMM - Manual

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