1. Disconnect all equipment from the output of the PXIe-4139.
2. 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.
3. Take a current measurement using the PXIe-4139.
4. Record the value from the previous step.
5. Verify that the recorded value falls within the test limits.
6. If more than one limit range is specified, repeat the previous steps using the values
specified in each limit range.
Verifying Load Regulation
Note Although load regulation is listed as a typical specification for the
PXIe-4139, verification is required. If the PXIe-4139 fails the load regulation
verification procedure, discontinue use of the device and contact an authorized NI
service representative to request a Return Material Authorization (RMA).
Refer to the following table as you complete the following steps:
Table 6. Load Regulation Verification
Level Range Limit Range and Limit Test Point As-found/As-left Limit
10 mA 600 mV 10 mA 1 mV
1. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the PXIe-4139.
2. Set the niDCPower Sense property or NIDCPOWER_ATTR_SENSE attribute to Local.
3. Make the necessary connections for this procedure, as shown in the following figure:
NI PXIe-4139 Calibration Procedure | © National Instruments | 11
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