Adjusting Current Measurement
Compare a set of measured currents reported by the NI 4141 to the currents measured by an
external DMM.
Refer to the following table as you complete the following steps.
Table 7. Current Measurement Adjustment
Level Range
Limit Range and Limit
Test Point
10 μA
10 V
10 μA
-10 μA
100 μA
10 V
100 μA
-100 μA
1 mA
10 V
1 mA
-1 mA
10 mA
10 V
10 mA
-10 mA
100 mA
10 V
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.
Store the values from the previous step as inputs for the niDCPower Cal Adjust VI or
function called in the following steps.
5.
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 NI 4141 up to this step. For zero
current test points, disconnect all external equipment from the I/O connector on the
NI 4141 and take a current measurement solely with the NI 4141, in order to ensure that
the output current is zero. In calculations for zero current test points, substitute 0 A for
the
DMM Measured Current
.
6.
If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
7.
Update the measurement calibration constants by configuring and calling the VI
niDCPower Cal Adjust Current Measurement or
niDCPower_CalAdjustCurrentMeasurement
function.
a)
Input the DMM measurements as the
measured outputs
.
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NI PXIe-4141 Calibration Procedure
