Verification
The performance verification procedures assume that adequate traceable uncertainties are
available for the calibration references.
You can use the verification procedures described in this section for both pre-adjustment and
post-adjustment verification. You can omit sections (for example, the
Verifying AC Current
section), however, any function not verified during post-adjustment will no longer be traceable
and should not be used for measurements.
Note
Self-calibrate the PXIe-4081 before performing the verification procedures.
Verifying DC Voltage
Complete the following steps to verify DC voltage:
1.
Plug in the shorting bar between the HI and LO terminals of the PXIe-4081.
2.
Wait two minutes for thermal EMF to stabilize.
3.
Reset the PXIe-4081.
4.
Initialize the PXIe-4081 for DC voltage with a range of 100 mV and resolution of
7.5 digits.
5.
Verify the accuracy for each configuration in the following table:
a)
Acquire the measurement at each specified range and input resistance.
b)
Compare to the specified limits.
DMM Settings
As-Found Limits
As-Left Limits
Range
Input Resistance
Lower
Upper
Lower
Upper
100 mV
>10 GΩ / 10 MΩ
-2.80 µV
2.80 µV
-2.50 µV
2.50 µV
1 V
>10 GΩ / 10 MΩ
-4.5 µV
4.5 µV
-2.8 µV
2.8 µV
10 V
>10 GΩ / 10 MΩ
-7 µV
7 µV
-7 µV
7 µV
100 V
10 MΩ
-0.25 mV
0.25 mV
-0.20 mV
0.20 mV
1000 V
10 MΩ
-0.5 mV
0.5 mV
-0.5 mV
0.5 mV
6.
Remove the shorting bar from the PXIe-4081.
7.
Set the calibrator to
Standby
.
8.
Connect the PXIe-4081 to the calibrator using low thermal EMF cables according the
following figure.
PXIe-4081 Calibration Procedure
|
© National Instruments
|
5