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-4137 to the currents measured by an
external 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
1 Ω
1 A
-1 A
1.
Make the necessary connections for this procedure, as shown in the following figure:
Figure 12. Current Output and Measurement Adjustment 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-4137.
3.
Set the first specified level range, limit range, and limit on the PXIe-4137.
22
|
ni.com
|
NI PXIe-4137 Calibration Procedure
