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. Disconnect the DMM. Leave the PXIe-4139 output on.
9. Make the necessary connections as shown in the following figure:
Figure 7. Current Connection Diagram, Part 2
Sense LO
Sense HI
HI
LO
Precision
Shunt
NI-DCPower Device
10. Take a current measurement using the PXIe-4139.
11. Record the value from the previous step.
12. Verify that the recorded PXIe-4139 value falls within the test limits.
13. 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-4139 up to this step.
14. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Verifying 100 μA to 100 mA Current Measurement and
Output
Compare a set of currents measured by a DMM to the current test points requested by the
PXIe-4139.
Refer to the following table as you complete the following steps.
Complete this procedure only after successfully completing all previous verification
procedures. Verify ranges in the order listed in the table.
14 | ni.com | NI PXIe-4139 Calibration Procedure
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