8.
Update the output calibration constants by configuring and calling the niDCPower Cal
Adjust Current Limit VI or
niDCPower_CalAdjustCurrentLimit
function.
a)
Input the calculated shunt current measurements as the
measured outputs
.
b)
Input the test points as the
requested outputs
.
c)
Input the specified level range as the
range
.
9.
If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Adjusting 1 A and 3 A Current Output and Measurement
Compare a set of measured currents reported by the PXIe-4139 to the currents measured by a
DMM.
Complete this procedure only after successfully completing all previous adjustment
procedures. Adjust ranges in the specified order.
Refer to the following table as you complete the following steps.
Table 12. 1 A and 3 A Current Output and Measurement Adjustment
Level Range
Limit Range and Limit
Shunt
Test Point
1 A
6 V
1 Ω
1 A
-1 A
3 A
6 V
333 mΩ
3 A
-3 A
1.
Make the necessary connections for this procedure, as shown in the following figure:
Figure 12. Current Verification Connection Diagram
NI-DCPower Device
Sense LO
Sense HI
HI
LO
+
–
Precision
Shunt
DMM
Voltage
Mode
2.
Set the
niDCPower Output Function
property or
NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the PXIe-4139.
3.
Set the first specified level range, limit range, and limit on the PXIe-4139.
NI PXIe-4139 Calibration Procedure
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© National Instruments
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