National Instruments NI PXIe-4112

Table 6. Voltage Load Regulation Verification
Level Range Limit Range and Limit Test Point Load
1
Load
2
60 V 1 A 60 V 0.1 A 0.9 A
1. Set the programmable electronic load to the first specified value (Load
1
).
2. Set the first specified level range, limit range, and limit on the NI 4112.
3. Set the level on the NI 4112 to the first specified test point.
4. Take a voltage measurement across the output terminals of the NI 4112 using DMM1.
5. Record the voltage from the previous step as V1.
6. Take a current measurement using DMM2.
7. Record the current from the previous step as I1.
8. Change the load from Load
1
to Load
2
. Repeat the previous four steps. This time, record
the values as V2 and I2.
9. Calculate the upper and lower voltage load regulation test limits using the following
formula, and then record the test limits.
Voltage Load Regulation Test Limit = ± (I1 - I2) × 0.012 V/A
10. Calculate the voltage change using the following formula, and record the value.
Voltage change=V1 - V2.
11. Verify the voltage change falls within the voltage load regulation test limits.
12. If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
Connecting and Configuring Equipment for Current Load
Verification
1. Make the necessary connections for this procedure, as shown in the following figure.
Figure 5. Current Load Connection Diagram
2
NI-DCPower Device
Sense –
Sense +
+
–
DMM2
Current
Mode
+
–
DMM1
Voltage
Mode
+
–
Electronic Load
Constant Voltage
Mode
Remote Sense
Mode
Sense +
Sense –
Ensure cable
resistance <0.1 Ohm
+
–
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.
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