Table 8. 100 µA to 100 mA Current Output and Measurement Verification
Level Range
Limit
Range and
Limit
Test Point
As-Found
Measurement Test
Limit (% of C
Offset)
As-Left Measurement
Test Limit (% of
C Offset)
100 µA
6 V
-100 µA
0.022% + 2 nA
0.0070% + 970 pA
100 µA
1 mA
6 V
-1 mA
0.022% + 20 nA
0.0070% + 9.7 nA
1 mA
10 mA
6 V
-10 mA
0.022% + 200 nA
0.0071% + 97 nA
10 mA
100 mA
6 V
-100 mA
0.022% + 2 μA
0.0102% + 970 nA
100 mA
1.
Make the necessary connections for this procedure, as shown in the following figure:
Figure 8. Current Verification Connection Diagram
NI-DCPower Device
Sense LO
Sense HI
HI
LO
DMM
Current
Mode
+
–
2.
Set the
niDCPower Output Function
property or
NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the PXIe-4137.
3.
Set the first specified level range, limit range, and limit on the PXIe-4137.
4.
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.
5.
Set the level on the PXIe-4137 to the first specified test point.
16
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NI PXIe-4137 Calibration Procedure
