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

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  • Page 1

    CALIBRATION PROCEDURE NI 4070/4072 6½-Digit FlexDMM This document contains step-by-step in structions for writing an ex ternal calibration procedure for the National Instruments PXI/PCI-407 0 and NI PXI-4072 digital multimet ers (DMMs). Each of these National Instruments DMMs is a 6½-digit FlexDMM and 1.8 MS/s isolated digitizer . For more inform[...]

  • Page 2

    NI 4070/4072 Calibrati on Procedure 2 ni.com Conventions The following conventions ar e used in this document: » The » symbol leads you through nested menu items and dialog box opt ions to a final action. The sequence File»Page Setup»Options directs you t o pull down the File menu, select the Page Setup item, and select Options from the last di[...]

  • Page 3

    © National Instruments Corporation 3 NI 4070/4072 Calibration Procedure The procedures in this document are described using C func tion calls. Y ou also can program in LabVIEW usin g the VIs that correspond to the C function calls. Documentation Requirements In addition to this calibratio n document, you may find th e following references helpful [...]

  • Page 4

    NI 4070/4072 Calibrati on Procedure 4 ni.com Calibration Inter val The accuracy requirements of your measurement application determine how often you should calibrate th e NI 4070/40 72. NI recommends performing a complete calibrati on at l east once every two years. NI does not guarantee the absolute accuracy of the NI 4070/ 4072 beyond this two-ye[...]

  • Page 5

    © National Instruments Corporation 5 NI 4070/4072 Calibration Procedure 300 pF range, a capacitor with v alu es between 90 –100% of full scale should be used. NI suggests using the capacitance standards of the SCA Series from IET Labs. This cal ibration procedure assumes the use o f 2 7 0p F , 1n F , 1 0 0n F , 1 0 μ F , and 1000 μ F standards[...]

  • Page 6

    NI 4070/4072 Calibr ation Procedure 6 ni.com • Clean any oxidation from the banana plugs on the Fluke 5440 cables before plugging them into the binding posts of th e calibrator or the banana plug connectors o f the NI 4070 /4072. Oxidation tarnishes th e copper banana plugs so that they appear dull rather than shiny and leads to greater thermal E[...]

  • Page 7

    © National Instruments Corporation 7 NI 4070/4072 Calibration Procedure Fluke 5700A/5720A user d ocumentation for instruction s on calibrating these de vices. Note Ensure that both the calibrator an d the NI 4070/ 4072 (installed in a powered-on PXI chassis or PC) are warmed up for at leas t 60 minutes before you begin this procedure. 3. Call niDM[...]

  • Page 8

    NI 4070/4072 Calibrati on Procedure 8 ni.com V erifying DC V oltage To verify DC voltage of the NI 4070/4072, com plete the following steps: 1. Plug in the insulated banana plug shorting bar acro ss the HI and LO banana plug connectors on the NI 4070/4072. 2. W ait one minu te for the thermal EMF to stabil ize. 3. Call niDMM_reset . 4. Call niDMM_C[...]

  • Page 9

    © National Instruments Corporation 9 NI 4070/4072 Calibration Procedure 12. 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 13. Call niDMM_Read . V erify that this measurement f all[...]

  • Page 10

    NI 4070/4072 Calibrati on Procedure 10 ni.com Figure 1. Cable Connections for Volt age and 2-Wire Resistance 23. W ait two minutes for th e thermal EMF to stabilize. 24. Generate 0 V on the calibrator . 25. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_DC_VOLTS • Range = 0.1 • Resolution = 100e–9 26[...]

  • Page 11

    © National Instruments Corporation 11 NI 4070/4072 Calibration Procedure 27. Call niDMM_ConfigureMultiPoint with the following parameters: • Trigger Count = 1 • Sample Count = 10 • Sample Trigger = NIDMM_VAL_IMMEDIATE • Sample Interval = –1 28. Call niDMM_ReadMultiPoint with the fo llo wing parameters: • Maximum Time = NIDMM_ VAL_TIME_[...]

  • Page 12

    NI 4070/4072 Calibrati on Procedure 12 ni.com 34. Set the input resistance of the NI 4070/4072 to >10 G Ω by calling niDMM_SetAttributeViReal64 with the following parameters: • Attribute_ID = NIDMM_ATTR _INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_ THAN_10_GIGAOHM 35. Call niDMM_Read . Subtract the pre viously stored 100 mV >1[...]

  • Page 13

    © National Instruments Corporation 13 NI 4070/4072 Calibration Procedure 45. Set the input resistance of the NI 4070/4072 to >10 G Ω by calling niDMM_SetAttributeViReal64 with the following parameters: • Attribute_ID = NIDMM_ATTR _INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_ THAN_10_GIGAOHM 46. Call niDMM_Read . V erify that thi[...]

  • Page 14

    NI 4070/4072 Calibrati on 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 . V erify that this measurement f alls betw een the limits liste[...]

  • Page 15

    © National Instruments Corporation 15 NI 4070/4072 Calibration Procedure 71. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_DC_VOLTS • Range = 300 • Resolution = 300e–6 72. Call niDMM_Read . Before you apply the volta g e, the DMM must be in the 300 V range. 73. Output 300 V on the calibrator . 74. [...]

  • Page 16

    NI 4070/4072 Calibrati on Procedure 16 ni.com 5. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_VOLTS • Range = 0.05 • Resolution = 50e–9 6. Call niDMM_Read . V erify that this meas urement falls between the limits listed in T able 16. 7. Call niDMM_ConfigureMeasurement with t he follo wing parame[...]

  • Page 17

    © National Instruments Corporation 17 NI 4070/4072 Calibration Procedure 13. Repeat step 12 for each of the re maining iterations sho wn in T able 2. 14. Output 500 mV at 30 Hz o n the calibrato r . 15. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = 0.5 • Resolution = 500e[...]

  • Page 18

    NI 4070/4072 Calibrati on Procedure 18 ni.com c. Call niDMM_Read . V erify that this meas urement falls between the limits listed in T able 16. d. Call niDMM_ConfigureMeasurement again, changing Mode to NIDMM_VAL_AC_VOLTS_DCCOUPLED . e. Call niDMM_Read . V erify that this meas urement falls between the limits listed in T able 16. 18. Output 5 V at [...]

  • Page 19

    © National Instruments Corporation 19 NI 4070/4072 Calibration Procedure 21. Refer to T a ble 4 for the appropriate calibrator outputs and parameter v alues as you complete the following steps: a. On the calibrator , output the value listed in the Calibrator Output column in T able 4 for the curren t iteration. b. C a l l niDMM_ConfigureMeasuremen[...]

  • Page 20

    NI 4070/4072 Calibrati on Procedure 20 ni.com 23. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = 50 • Resolution = 50e–6 24. Call niDMM_Read . V erify that this measurement f alls betw een the limits listed in T able 16. 25. Refer to T a ble 5 for the appropriate calibrat[...]

  • Page 21

    © National Instruments Corporation 21 NI 4070/4072 Calibration Procedure 26. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = 300 • Resolution = 300e–6 27. Call niDMM_Read . The DMM must be in the 3 00 V range before you apply the voltage. 28. Output 219 V at 30 Hz on the [...]

  • Page 22

    NI 4070/4072 Calibrati on Procedure 22 ni.com 31. Reset the calibrator for safety reasons. Y ou have completed v erifying the A C voltage of the NI 4070/40 72. Select one of the following options: • If you want to continue verifying o ther modes, go to the Verifying 4-Wire Resistance section. • If you do not want to v erify ot her modes and you[...]

  • Page 23

    © National Instruments Corporation 23 NI 4070/4072 Calibration Procedure 3. W ait two minutes for th e thermal EMF to stabilize if the Fluke 5440 cables were not previously connected in this configuration. 4. Call niDMM_reset . 5. Refer to T able 8 for th e appropriate calibrato r output and funct ion parameter values as you complete the following[...]

  • Page 24

    NI 4070/4072 Calibrati on Procedure 24 ni.com 6. Repeat step 5 for each of the rema ining iterations listed in T able 8. Y ou hav e completed verifying the 4-wire resistance of the NI 4070/4072. Select one of the follo wing options: • If you want to continue verifying o ther modes, go to the Verifying 2-Wire Resistance section. • If you do not [...]

  • Page 25

    © National Instruments Corporation 25 NI 4070/4072 Calibration Procedure 4. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = 10e3 • Resolution = 0.01 5. Call niDMM_ConfigureOffsetCompOhms with OffsetCompOhms set to NIDMM_VAL_OFFSET_COMP_OHMS_ON . 6. Call niDMM_Read . V erify that th[...]

  • Page 26

    NI 4070/4072 Calibrati on Procedure 26 ni.com 19. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = 100e6 • Resolution = 100 20. Call niDMM_Read and store the result as the 100 M Ω range of fset. 21. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDM[...]

  • Page 27

    © National Instruments Corporation 27 NI 4070/4072 Calibration Procedure 28. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = 10e3 • Resolution = 0.01 29. Call niDMM_ConfigureMultiPoint with the following parameters: • Trigger Count = 1 • Sample Count = 4 • Sample Trigger = NI[...]

  • Page 28

    NI 4070/4072 Calibrati on Procedure 28 ni.com 35. Call niDMM_ConfigureMultiPoint with the following parameters: • Trigger Count = 1 • Sample Count = 10 • Sample Trigger = NIDMM_VAL_IMMEDIATE • Sample Interval = –1 36. Call niDMM_ReadMultiPoint with the fo llo wing parameters: • Maximum Time = NIDMM_ VAL_TIME_LIMIT_AUTO • Array Size = [...]

  • Page 29

    © National Instruments Corporation 29 NI 4070/4072 Calibration Procedure 45. Call niDMM_Read . Subtract the pre viously stored 1 M Ω range offset from this measurement. V erify that the result falls between the tolerances listed in T able 18. 46. Output 100 k Ω on the calibrator without external sense or 2-wire compensation. 47. Call niDMM_Confi[...]

  • Page 30

    NI 4070/4072 Calibrati on Procedure 30 ni.com 57. Call niDMM_Read . Subtract the pre viously calculated 100 Ω range of fset from this measur ement. V erify that the result falls between the tolerances listed in T able 18. Y ou hav e completed verifying the 2-wire resistance of the NI 4070/4072. Select one of the follo wing options: • If you want[...]

  • Page 31

    © National Instruments Corporation 31 NI 4070/4072 Calibration Procedure 3. Call niDMM_reset to reset the NI 4070/4072 to a known state. 4. Set the current output on the calibrato r to NORM and output 0 A. 5. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_DC_CURRENT • Range = 0.02 • Resolution = 20e?[...]

  • Page 32

    NI 4070/4072 Calibrati on Procedure 32 ni.com 13. Output 20 mA on the calibrator . 14. Call niDMM_Read . V erify that this measurement f alls betw een the limits listed in T able 19. 15. Output –20 mA on the calib rator . 16. Call niDMM_Read . V erify that this measurement f alls betw een the limits listed in T able 19. 17. Output 200 mA on the c[...]

  • Page 33

    © National Instruments Corporation 33 NI 4070/4072 Calibration Procedure V erifying AC Current To verify the AC current of the NI 407 0/4072, complete the followin g 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 plug conn ectors, and fasten the connectors on [...]

  • Page 34

    NI 4070/4072 Calibrati on Procedure 34 ni.com 14. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_CURRENT • Range = 1 • Resolution = 1e–6 15. Call niDMM_Read . V erify that this measurement f alls betw een the limits listed in T able 20. 16. Output 1 A at 1 kHz on t he calibrator . 17. Call niDMM_R[...]

  • Page 35

    © National Instruments Corporation 35 NI 4070/4072 Calibration Procedure T o verify the frequency of the NI 4070/4072, comple te the following steps: 1. Remov e all connections from the NI 4070/40 72. Note Polarity is not importan t in steps 2, 3, and 5. 2. Connect one end of the coaxial cable to the Pomona 4892 double banana plug. 3. T igh ten th[...]

  • Page 36

    NI 4070/4072 Calibrati on Procedure 36 ni.com 12. Call GPCTR_Change_Parameter with the following parameters: • deviceNumber = the device number of the NI 6608, as signed by MAX • gpctrNum = ND_COUNTER_0 • paramID = ND_COUNT_2 • paramValue = 10e6 13. Call GPCTR_Control with the foll owing parameters: • deviceNumber = the device number of t[...]

  • Page 37

    © National Instruments Corporation 37 NI 4070/4072 Calibration Procedure V erifying Capacitance and Inductance (NI 4072 Only) This verification procedure only appl ies to the NI 4072 and requires additional test equi pment, as indicated i n the Additional Requirements for the NI 4072 section. Note The NI 4072 inductance accuracy is theore tically [...]

  • Page 38

    NI 4070/4072 Calibrati on Procedure 38 ni.com To verify the capacitance measuremen ts of the NI 4072, complete the following steps: 1. Disconnect any f ixt ures or cables from the NI 4072. 2. Call niDMM_reset to reset the NI 4070/4072 to a known state. 3. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_CAPA[...]

  • Page 39

    © National Instruments Corporation 39 NI 4070/4072 Calibration Procedure 11. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_CAPACITANCE • Range = 300e-12 • Resolution = 50e-15 12. Set the number of av erages of the NI 4072 to 20 b y calling niDMM_SetAttributeViInt32 with the following parameters: • [...]

  • Page 40

    NI 4070/4072 Calibrati on Procedure 40 ni.com 19. Set the number of av erages of the NI 4072 to 20 by calling niDMM_SetAttributeViInt32 with the following parameters: • Attribute_ID = NIDMM_A TTR_LC_NUMBER_MEAS_TO_AVERAGE • Attribute_V alue = 20 Note If you use capacitance verifi cation v alues that differ from the values listed in T able 10, v[...]

  • Page 41

    © 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 perfo rming the verification procedures first. The parameters Range , Resolution , Expected Measurement , and Frequency used in f[...]

  • Page 42

    NI 4070/4072 Calibrati on Procedure 42 ni.com Adjusting DC V oltage 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 4070/40 72, and fasten the connectors on the other end of the ca[...]

  • Page 43

    © 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_1 0_GIGAOHM • Expected Measurement = 10 11. Output –10 V on the calibrator . 12. Call niDMM_CalAdjustGain with the follow[...]

  • Page 44

    NI 4070/4072 Calibrati on Procedure 44 ni.com 23. Output 0 Ω from the calibrator without external sense or 2-wire compensation. 24. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VAL_2_WIRE_RES • Range = 10e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA • Expected Value = the display on the calibrator for 0 Ω 25. C[...]

  • Page 45

    © 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_CalAdjustOffset with the following parameter[...]

  • Page 46

    NI 4070/4072 Calibrati on Procedure 46 ni.com 46. Call niDMM_CalAdjustOffset with the following parameters: • Mode = NIDMM_VAL_4_WIRE_RES • Range = 10e3 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 47. Call niDMM_CalAdjustMisc with Type set to NIDMM_EXTCAL_MISCAL_RREF . 48. Call niDMM_SelfCal to self-calibrate the NI 4070/4072. 49. Output 0 ?[...]

  • Page 47

    © 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_VAL_2_WIRE_RES • Range = 100e3 • Inp[...]

  • Page 48

    NI 4070/4072 Calibrati on Procedure 48 ni.com • If you are not performing addi tional adjustments, refer to on e of the following sections: – Verification Procedures — to verify your new calibration coef ficients before savi ng them to the EEPR OM – Completing the Adjustment Procedures —if you do not wa nt to verify the adjustments you ha[...]

  • Page 49

    © National Instruments Corporation 49 NI 4070/4072 Calibration Procedure 5. Refer to T able 12 for the appropriate parameter values as you complete the following steps: a. Output 0 V on the calibrator . b. C a l l niDMM_CalAdjustOffset with Mode set to NIDMM_VAL_AC_VOLTS and the remaining parameters as sho wn in T able 12 for the current iteration[...]

  • Page 50

    NI 4070/4072 Calibrati on Procedure 50 ni.com 7. Refer to T able 13 for the appropria te calibrator outputs and parameter v alues as you complete the following steps: a. On the calibrator , output the value listed in the Calibrator Output column in T abl e 13 for t he current iteratio n. b. C a l l niDMM_CalAdjustACFilter with Mode set to NIDMM_VAL[...]

  • Page 51

    © National Instruments Corporation 51 NI 4070/4072 Calibration Procedure 10 500 mV 5 NIDMM_VAL_AC_VOLTS 0.5 5e3 500 mV 5 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 5e3 11 500 mV 20 NIDMM_VAL_AC_VOLTS 0.5 20e3 500 mV 20 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 20e3 12 500 mV 50 NIDMM_VAL_AC_VOLTS 0.5 50e3 500 mV 50 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 50e3 13 500 mV 100[...]

  • Page 52

    NI 4070/4072 Calibrati on Procedure 52 ni.com 24 5 V 500 NIDMM_VAL_AC_VOLTS 5 500e3 5 V 500 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 500e3 25 50 V 1 NIDMM_VAL_AC_VOLTS 50 1e3 50 V 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 1e3 26 50 V 5 NIDMM_VAL_AC_VOLTS 50 5e3 50 V 5 NIDMM_VAL_AC_VOLTS_DCCOUPLED 50 5e3 27 50 V 20 NIDMM_VAL_AC_VOLTS 50 20e3 50 V 20 NIDMM_VAL_AC_VOLT[...]

  • Page 53

    © National Instruments Corporation 53 NI 4070/4072 Calibration Procedure 9. Reset the calibrator for safety reaso ns. 10. Call niDMM_CalAdjustMisc with Type set to NIDMM_EXTCAL_MISCCAL_SECTION . Y ou hav e completed adjusting the AC voltage modes of the NI 40 70/4072. Select one of the follo wing options: • If you are performing additional adjus[...]

  • Page 54

    NI 4070/4072 Calibrati on Procedure 54 ni.com • If you skip this section and you want to verify the new calibration coef ficients before sa ving th em to the EEPR O M, repeat the Verification Procedures sectio n (except for Initial Setup ). • If you skip this section and you do not want to verify the new calibration coeff icients, go to the Com[...]

  • Page 55

    © National Instruments Corporation 55 NI 4070/4072 Calibration Procedure 11. Call niDMM_CalAdjustOffset with the following parameters: • Mode = NIDMM_VAL_AC_CURRENT • Range = 0.01 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 12. Output 200 mA on the calib rator . 13. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VA[...]

  • Page 56

    NI 4070/4072 Calibrati on Procedure 56 ni.com 22. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VAL_DC_CURRENT • Range = 1 • Input Resistance = NIDMM_VAL_RESISTANCE_NA • Expected Value = – 1 23. Output 0 A on the calibrator with the current ou tput set to NORM . 24. Call niDMM_CalAdjustOffset with the following pa[...]

  • Page 57

    © 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 v oltag e and resistance before running these adjustment steps. Du ring this procedure, be sure t o keep hands and any other moving object[...]

  • Page 58

    NI 4070/4072 Calibrati on Procedure 58 ni.com • T o finish the calibration and close the session, go to the Completing th e Adjustment Procedures section. Completing the Adju stment Procedures To complete the adjustment procedure for the NI 4070/4072 and close the session, call niDMM_CloseExtCal with the f ollowing parame ter: • Action = NIDMM_[...]

  • Page 59

    © National Instruments Corporation 59 NI 4070/4072 Calibration Procedure AC Voltage –100 mV 100 mV >10 G Ω / 10 M Ω – 0.100006 V – 0.0999 94 V – 0.100002 V – 0.09 9998 V 1V 1V >10 G Ω / 10 M Ω 0 .999969 V 1.000031 V 0.999992 V 1.000008 V –1 V 1V >10 G Ω / 10 M Ω –1.00 0031 V – 0 .999969 V –1.00000 8 V – 0. 999992[...]

  • Page 60

    NI 4070/4072 Calibrati on Procedure 60 ni.com 500 mV 100 kHz 500 mV AC /D C 0.4974 V 0.50 26 V 500 mV 300 kHz 500 mV AC /D C 0.48 475 V 0.51525 V 5V 30 Hz 5V DC 4.9945 V 5.0055 V 5V 50 Hz 5V AC / D C 4.9965 V 5.0035 V 5V 1k H z 5V AC / D C 4.9965 V 5.00 35 V 5V 1k H z 50 V AC/ DC 4.9875 V 5.0125 V 5V 1k H z 300 V AC / D C 4.9375 V 5. 0625 V 5V 20 k[...]

  • Page 61

    © National Instruments Corporation 61 NI 4070/4072 Calibration Procedure 4-Wire Resistance Note T olerances are provided for 4-wire resistan ce instead of absolute limits because the limits depend on the actual resistan ce v alue output by your calibrator . 2-Wire Resistance Note T olerances are provided for 2-wire resistan ce instead of absolute [...]

  • Page 62

    NI 4070/4072 Calibrati on Procedure 62 ni.com DC Current AC Current 100 k Ω 100 k Ω ±86 ppm ±17 ppm 10 k Ω 10 k Ω ±83 ppm ±14 ppm 1k Ω 1k Ω ±83 ppm ±14 ppm 100 Ω 100 Ω ±90 ppm ±25 ppm Table 19. NI 4070/4072 DC Current Verification Limits Calibrator Amplitude Range 2-Y ear Limits Lower Upper 0A 20 mA –1.5 μ A 1.5 μ A 0A 200 mA ?[...]

  • Page 63

    © National Instruments Corporation 63 NI 4070/4072 Calibration Procedure Frequency Capacitance and Inductance Note Because the actual capacitance verif ication values can dif fer from the following v alues, T able 22 provides tolerances th at correspond to the NI 4072 accuracy specifications Table 21. Frequency Limits NI 6608 Output Frequency 2-Y [...]

  • Page 64

    NI 4070/4072 Calibrati on Procedure 64 ni.com Appendix A: Calibration Options The complete calibration process for the NI 4070/40 72 consists of verifying, adjusting, and reverifying a de vice. During verification, you compare the measured performance to an external standard of known measurement uncertainty to confirm that the product meets or exce[...]

  • Page 65

    © National Instruments Corporation 65 NI 4070/4072 Calibration Procedure Table 23. Summary of Adjustment Options Adjustment Opt ional Required DC V oltage — Y Resistance — Y A C V oltage Y — AC / D C C u rr en t Y — Inductance and Capacitance (NI 4072 only) — Y[...]

  • Page 66

    NI 4070/4072 Calibrati on Procedure 66 ni.com Figure 4. V erification Procedures Flowchart V er ify C a p a cit a nce a nd Ind u ct a nce (NI 4072 Only)? V er ify DC V olt a ge Mode? V er ify AC V olt a ge Mode? V er ify 4-Wire Re s i s t a nce Mode? V er ify 2-Wire Re s i s t a nce Mode? V er ify DC C u rrent Mode? V er ify AC C u rrent Mode? V er[...]

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    © National Instruments Corporation 67 NI 4070/4072 Calibration Procedure Figure 5. Adjustment Procedures Flowchart Ye s Go to V er ification Procedures Flowchart V er ification Go to Adjusting DC V oltage and Resistance Go to Adjusting AC V oltage Modes No No Ye s Ye s No Go to Completing the Adjustment Procedures Adjust AC V oltage Modes? Adjust [...]

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