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NI 4070/4072 Calibration Procedure 38 ni.com
To verify the capacitance measurements of the NI 4072, complete the
following steps:
1. Disconnect any fixtures 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 the following
parameters:
• Function =
NIDMM_VAL_CAPACITANCE
• Range = 300e-12
• Resolution = 50e-15
4. 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
This measurement corresponds to a 0 pF capacitance.
5. Call
niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 22.
6. Plug in the insulated banana plug shorting bar across the HI and LO
banana plug connectors of the NI 4072.
7. Call
niDMM_ConfigureMeasurement with the following
parameters:
• Function =
NIDMM_VAL_INDUCTANCE
• Range = 10e-6
• Resolution = 1e-9
8. Set the number of averages of the NI 4072 to 40 by calling
niDMM_SetAttributeViInt32 with the following parameters:
• Attribute_ID =
NIDMM_ATTR_LC_NUMBER_MEAS_TO_AVERAGE
• Attribute_Value = 40
Note
This measurement corresponds to a 0 μH inductance.
9. Call
niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 22.
10. Remove the shorting bar and plug the 270 pF verification capacitor
into the HI and LO banana plug connectors of the NI 4072. Remember
to wait 30 seconds for the temperature to stabilize before performing
the next step.