National Instruments NI 4070/4072 6 1/2-Digit FlexDMM - page 40

NI 4070/4072 Calibration Procedure 40 ni.com

19. Set the number of averages of the NI4072 to 20 by calling

niDMM_SetAttributeViInt32 with the following parameters:

•Attribute_ID = NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE

•Attribute_Value = 20

Note If you use capacitance verification values that differ from the values listed in

Table10, verify that each measurement falls between the tolerances listed in Table 22.

Thet olerances shown in Table22 correspond to the NI 4072 accuracy specifications.

20. Call niDMM_Read. Verify that this measurement falls between the

tolerances listed in Table22.

21. Remove the verification capacitor, and plug into the HI and LO banana

plug connectors of the NI 4072 the next capacitor to be verified,

according to Table10.

22. Repeat steps 18 through 21, using the parameters shown in

Table10 for niDMM_ConfigureMeasurement and

NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE for all verification

capacitors listed.

Note If you use capacitance verification values that differ from the values listed in

Table10, verify that each measurement falls between the tolerances listed in Table 22.

Thet olerances shown in Table22 correspond to the NI 4072 accuracy specifications.

You have completed verifying the capacitance and inductance of the

NI4 072. Select one of the following options:

• If you are performing a pre-adjustment verification, call

niDMM_close to close the session.

• If you are performing a post-adjustment verification, go to the

Completing the Adjustment Procedures section.

Table 10. niDMM_ConfigureMeasurement Parameters

Value of

Verification Capacitor

niDMM Configure Measurement Parameters

Number of AveragesRange Resolution

100nF 100e-9 10e-12 20

1e-6 100e-12 20

10uF 10e-6 1e-9 20

100e-6 10e-9 3

1000uF 1e-3 100e-9 3

10e-3 1e-6 3

Contents

Main CALIBRATION PROCEDURE NI 4070/4072 6-Digit FlexDMM Contents Conventions Software Requirements Documentation Requirements Calibration Function Reference Password Calibration Interval Test Equipment Required Test Equipment Requirements for All NI 4070/4072 Devices Additional Requirements for the NI 4072 Optional Test Equipment Test Conditions Calibration Procedures Initial Setup Verification Procedures Verifying DC Voltage Page NI 4070/4072 Calibration Procedure 10 ni.com Figure 1. Cable Connections for Voltage and 2-Wire Resistance niDMM_SetAttributeViReal64 with the following parameters: Attribute_ID = Attribute_Value = NIDMM_VAL_GREATER_THAN_10_GIGAOHM 1 NI4070/4072 2 Fluke 5700A/5720A Calibrator 3 Fluke 5440 Cable Table 1. Fluke 5440 Cable Connections BananaPlug Connector (NI4070/4072) Banana Plug Color (Fluke 5440Cable) Page Page Page Page Verifying AC Voltage Page Page Page Page Page Page Verifying 4-Wire Resistance Page Verifying 2-Wire Resistance Page Page Page Page Page Verifying DC Current Page Page Verifying AC Current Verifying Frequency Page Page Verifying Capacitance and Inductance (NI 4072 Only) Page Page Page Adjustment Procedures Setting Up the Test Equipment Adjusting DC Voltage and Resistance Page Page Page Page Page Adjusting AC Voltage (AC- and DC-Coupled) Modes Page Page Page Table 13. niDMM_CalAdjustACFilter Parameters (Continued) Adjusting Current Modes Page Page Adjusting Capacitance and Inductance (NI 4072 Only) Page Completing the Adjustment Procedures Verification Limits DC Voltage AC Voltage Table 16. NI 4070/4072 AC Voltage Verification Limits Table 15. NI 4070/4072 DC Voltage Verification Limits (Continued) Table 16. NI 4070/4072 AC Voltage Verification Limits (Continued) 4-Wire Resistance Note Tolerances are provided for 4-wire resistance instead of absolute limits because the limits depend on the actual resistance value output by your calibrator. 2-Wire Resistance Note Tolerances are provided for 2-wire resistance instead of absolute limits because the DC Current AC Current Table 19. NI 4070/4072 DC Current Verification Limits Table 20. NI 4070/4072 AC Current Verification Limits Table 18. NI 4070/4072 2-Wire Resistance Verification Tolerances (Continued) Frequency Capacitance and Inductance Note Because the actual capacitance verification values can differ from the following values, Table22 provides tolerances that correspond to the NI 4072 accuracy specifications Table 21. Frequency Limits Appendix A: Calibration Options Page Figure 4. Verification Procedures Flowchart NI 4070/4072 Calibration Procedure 66 ni.com Figure 5. Adjustment Procedures Flowchart National Instruments Corporation 67 NI 4070/4072 Calibration Procedure Where to Go for Support