7.
Compare a DMM current measurement to the current measurement test limits.
a)
Take a current measurement using the DMM.
b)
Calculate the lower and upper current measurement test limits using the following
formula:
Current Measurement Test Limits
=
Test Point
± (|
Test Point
| *
% of Current
+
Offset
)
c)
Verify the DMM measurement falls within the test limits.
8.
If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the PXIe-4135 up to this step.
9.
If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
10. Configure the PXIe-4135 output to disable.
Verifying 1 A and 3 A Current Measurement and
Output
Compare a set of currents measured by a DMM to the current test points requested by the
PXIe-4135.
Complete this procedure only after successfully completing all previous verification
procedures. Verify level ranges in the order listed in the table.
Refer to the following table as you complete the following steps:
Table 12. 1 A and 3 A Current Output and Measurement Verification
Level
Range
Limit
Range and
Limit
Shunt
Test
Point
As-Found
Measurement Test
Limit (% of C
Offset)
As-Left
Measurement Test
Limit (% of C
Offset)
1 A
6 V
1 Ω
-1 A
0.035% + 20 μA
0.0051% + 8.5 μA
1 A
3 A
6 V
1 Ω
-1 A
0.075% + 600 μA
0.0051% + 85 μA
1 A
1.
Make the necessary connections for this procedure, as shown in the following figure:
4
As-left measurements for the 1 A and 3 A level range are relative to the external calibration
source.
PXIe-4135 Calibration Procedure
|
© National Instruments Corporation
|
21
