Table 3. Current Output and Measurement Verification (Continued)
Level
Range
Limit
Range
and Limit
Test Point
DMM
Range
As-Found
Output Test
Limit (% of
C
Offset)
As-Found
Measurement Test
Limit (% of C
Offset)
1 mA
10 V
-1 mA
1 mA
0.03% + 30 nA
0.03% + 30 nA
-750 μA
1 mA
-500 μA
1 mA
-250 μA
1 mA
0 mA
1 μA
250 μA
1 mA
500 μA
1 mA
750 μA
1 mA
1 mA
1 mA
10 mA
10 V
-10 mA
10 mA
0.03% + 300 nA
0.03% + 300 nA
0 mA
10 μA
10 mA
10 mA
100 mA
10 V
-100 mA
100 mA
0.03% + 3.0 μA
0.03% + 3.0 μA
0 mA
100 μA
100 mA
100 mA
1.
Set the first specified level range, limit range, and limit on the NI 4141.
2.
Set the level on the NI 4141 to the first specified test point.
3.
Take a current measurement using the DMM, and take a current measurement using the
NI 4141.
4.
Record the values from the previous step.
5.
Calculate the lower and upper current output test limits using the following formula:
Current Output Test Limits
=
Test Point
± (|
Test Point
| ×
% of Current
+
Offset
)
6.
Verify that the recorded DMM value falls within the test limits.
7.
Calculate the lower and upper current measurement test limits using the following
formula:
Current Measurement Test Limits
=
DMM Measured Current
± (|
DMM
Measured Current
| ×
% of Current
+
Offset
).
8.
Verify that the recorded NI 4141 value falls within the test limits.
NI PXIe-4141 Calibration Procedure
|
© National Instruments Corporation
|
9
