![background image](http://html1.mh-extra.com/html/national-instruments/ni-pxie-4139/ni-pxie-4139_calibration-procedure_3568915012.webp)
Figure 5. Load Regulation Connection Diagram
NI-DCPower Device
Sense LO
Sense HI
HI
LO
Note
Connection wires should be 18 or 20 AWG and as short as possible to
ensure low resistance.
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.
Verifying
1 μ
A and
10 μ
A Current Measurement and
Output
Compare a set of measured currents reported by the PXIe-4139 to the currents measured by a
DMM.
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.
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NI PXIe-4139 Calibration Procedure