2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Remote.
3. Make the necessary connections for this procedure, as shown in the following figure:
Figure 3. Voltage Remote Sense Diagram, Part 1
2
NI-DCPower Device
Sense LO
Sense HI
HI
LO
Load1
4. Set the first specified level range, limit range, and limit on the PXIe-4139.
5. Measure the internal device temperature and perform self-calibration if necessary.
a) If the internal device temperature exceeds T
cal
±1 °C, wait up to five minutes for the
temperature to stabilize to within T
cal
±1 °C.
b) If after five minutes the stable temperature still exceeds T
cal
±1 °C, call the self-
calibration VI or function.
6. Set the level on the PXIe-4139 to the first specified test point.
7. Take a voltage measurement using the PXIe-4139.
8. Record the voltage from the previous step as V1.
9. Repeat the previous three steps for the other test point specified in the range. This time,
record the value as V2.
10. Calculate the remote sense error using the following formula, and then record the value.
Remote Sense Error = |V2 - V1|
11. Verify that the recorded value falls within the test limits.
12. Repeat the previous steps. This time, make the necessary connections as shown in the
following figure:
2
Follow industry best practices for minimizing thermal electromotive force (EMF) when making the
necessary connections for this procedure.
NI PXIe-4139 Calibration Procedure | © National Instruments | 9
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