User's Manual

NI 4070/4072 Calibration Procedure 40 ni.com
19. Set the number of averages of the NI 4072 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
Table 10, verify that each measurement falls between the tolerances listed in Table 22.
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.
20. Call
niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 22.
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 Table 10.
22. Repeat steps 18 through 21, using the parameters shown in
Table 10 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
Table 10, verify that each measurement falls between the tolerances listed in Table 22.
The tolerances shown in Table 22 correspond to the NI 4072 accuracy specifications.
You have completed verifying the capacitance and inductance of the
NI 4072. 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
100 nF 100e-9 10e-12
20
1e-6 100e-12 20
10 uF 10e-6 1e-9 20
100e-6 10e-9 3
1000 uF 1e-3 100e-9 3
10e-3 1e-6 3