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.
10. Configure the PXIe-4135 output to disable.
Adjusting 1 A and 3 A Current Output and Measurement
Compare a set of measured currents reported by the PXIe-4135 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 15. 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 14. Current Output and Measurement Adjustment Connection Diagram
Triax to Banana/
Bare Wire
Precision
Shunt
LO
LOS
HI
HIS
DMM
Voltage
Mode
+
–
(Banana)
(Banana)
NI-DCPower Device
Sense LO
Sense HI
(Triax)
HI
(Triax)
LO
CHS GND
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.
26
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PXIe-4135 Calibration Procedure
