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

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

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

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.