3.
Calculate the current through the shunt by completing the following steps.
a)
Take a voltage measurement across the shunt using the DMM.
b)
Divide the voltage measurement by the calibrated value of the shunt.
c)
Record the calculated value as
DMM Measured Current
.
4.
Calculate the lower and upper current measurement test limits using the following
formula:
Current Measurement Test Limits
=
DMM Measured Current
± (|
DMM Measured
Current
| ×
% of Current
+
Offset
)
5.
Take a current measurement using the NI 4113.
6.
Record the value from the previous step.
7.
Verify that the recorded NI 4113 value falls within the test limits.
8.
Repeat the previous seven steps for each test point specified in the level range.
9.
If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Load Regulation
Connecting and Configuring Equipment for Voltage Load
Regulation Verification
1.
Make the necessary connections for this procedure, as shown in the following figure.
Figure 4.
Voltage Load Connection Diagram
23
NI-DCPower Device
Sense –
Sense +
+
–
DMM2
Voltage
Mode
+
–
DMM1
Voltage
Mode
+
–
Precision
Shunt
Ensure cable
resistance
<0.1 Ohm
Electronic Load
Constant Current
Mode
Remote Sense
Mode
Sense +
Sense –
+
–
2
Configure the electronic load for remote sense mode, and ensure that cables not corrected by
remote sense have a total resistance of <0.1 Ω.
3
If you make measurements using only one DMM, sequentially set up the DMM connections as
specified by the procedure steps.
NI PXIe-4113 Calibration Procedure
|
© National Instruments
|
9
