©
National Instruments Corporation
37
NI 4070/4072 Calibration Procedure
5.
Call
niDMM_Read
. Verify that this measurement falls between the
tolerances listed in Table 24.
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
μ
H inductance.
9.
Call
niDMM_Read
. Verify that this measurement falls between the
tolerances listed in Table 24.
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.
11. Call
niDMM_ConfigureMeasurement
with the following
parameters:
•
Function
=
NIDMM_VAL_CAPACITANCE
•
Range
=
300e-12
•
Resolution
=
50e-15
12. 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
13. Call
niDMM_Read
. Verify that this measurement falls between the
tolerances listed in Table 24.
Note
If you use capacitance verification values that differ from the values listed in
Table 12, verify that each measurement falls between the tolerances listed in Table 24.
The tolerances shown in Table 24 correspond to the NI 4072 accuracy specifications.