2. Connect the DMM to the NI 4112 connector pins with dedicated pairs of wires to avoid
including lead drop in the DMM measurement.
3. Set the niDCPower Output Function property or NIDCPOWER_OUTPUT_FUNCTION
attribute to DC Current for the NI 4112.
Verifying Current Load Regulation
Use the NI 4112 in constant current mode to confirm the output current change falls within
calculated limits while varying the load voltage.
Run this test only after successfully verifying current output and measurement.
Refer to the following table as you complete the following steps.
Table 7. Current Load Regulation Verification
Level Range Limit Range and Limit Test Point Load
1
Load
2
1 A 60 V 1 A 6 V 54 V
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 current load regulation test limits using the following
formula, and then record the test limits.
Current Load Regulation Test Limit = (V1 - V2) × 0.000032 A/V
10. Calculate the current change using the following formula:
Current change= I1 - I2
11. Verify the current change falls within the current 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.
Remote Sense
Connecting and Configuring Equipment for Voltage Remote
Sense Accuracy Verification
1. Make the necessary connections for this procedure, as shown in the following figure.
NI PXIe-4112 Calibration Procedure | © National Instruments | 11
To Next Page
Loading...
