Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
Appendix B: Verification
077114601 / March 2019
B-41
Check overcurrent protection
This procedure uses the same test setup as
Check DC overvoltage protection
(on page B-26).
Make sure the warm-up criteria have been met, as described in the Performance verification
conditions.
To check overcurrent protection:
1. Set the voltmeter as follows:
Set to measure DC voltage.
Set the current range to autorange.
2. Set the electronic load as follows:
Set to constant voltage (CV) mode.
3. Set the device under test (DUT) to 100% of the full-scale output voltage.
4. Set the overcurrent protection (OCP) threshold to 10% of full-scale output current.
5. Turn the DUT output on.
6. Set DUT current to OCP
–0.3 A and then slowly increase the DUT current by 0.01 A step by step
until OCP is triggered. When triggered, the output voltage abruptly drops below 1 V, and an OCP
error is indicated on the display.
7. Enter the current number reading (where OCP triggering occurred) in the DC overcurrent
protection table for checking DC overcurrent detection.
8. Reset OCP. Press the Enter key to clear the OCP error.
9. Set the OCP threshold to 25% of full-scale output current and repeat step 5 through step 8.
10. Set the OCP threshold to 50% of full-scale output current and repeat step 5 through step 8.
11. Set the OCP threshold to 75% of full-scale output current and repeat step 5 through step 8.
12. Set the OCP threshold to 90% of full-scale output current and repeat step 5 through step 8.
