Table 11. 100 µA to 100 mA Current Output and Measurement Verification (Continued)
Level Range
Limit
Range and
Limit
Test Point
As-Found
Measurement Test
Limit (% of C
Offset)
As-Left Measurement
Test Limit (% of
C Offset)
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 10. Current Verification Connection Diagram
DMM
Current
Mode
+
–
NI-DCPower Device
Sense LO
Sense HI
(Triax)
HI
(Triax)
LO
CHS GND
Triax to Banana/
Bare Wire
Shielded Combicon to
Banana/Bare Wire
2.
Set the
niDCPower Output Function
property or
NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the PXIe-4135.
3.
Set the first specified level range, limit range, and limit on the PXIe-4135.
4.
Measure the internal device temperature and perform self-calibration if necessary.
a)
After measuring the internal device temperature, wait for the internal device
temperature to stabilize. Temperature is considered stable when it has not changed
by more than ±1 °C in the previous 5 minutes.
b)
After the internal temperature has stabilized, if the temperature still exceeds
T
cal
± 1 °C, call the self-calibration VI or function.
5.
Set the level on the PXIe-4135 to the first specified test point.
6.
Complete the following 4 steps within 5 minutes or less of completing the previous step
in order to ensure the internal device temperature remains stable.
20
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PXIe-4135 Calibration Procedure
