Check Dc Overvoltage Protection - Tektronix Keithley 2281 Series Reference Manual

Appendix B: Verification

Check DC overvoltage protection

This procedure uses the same test setup as the previous procedure (see
accuracy without remote sense
Make sure the warm-up criteria have been met, as described in the Performance verification
conditions.
To check DC overvoltage protection:
1. Set the voltmeter as follows:

Set to measure DC voltage.

Set the current range to autorange.

Verify that the Math mx+b function is disabled (shift DCV), assuring that voltage is being read.
2. Set the electronic load as follows:

Set to Constant Current.

Set to draw 1 A.
3. Set the DUT to 100% of the full-scale output current.
4. Set the overvoltage protection (OVP) threshold to 10% of full-scale output voltage.
5. Set DUT output voltage 0.5 V lower than the OVP threshold and turn the DUT output ON.
6. Increase the DUT output voltage slowly by 0.01 V one step at a time until OVP is triggered. When
triggered, the output voltage abruptly drops below 1 V and an OVP error is indicated on the
display.
7. Enter the voltmeter reading (where OVP triggering occurred) in the DC overvoltage protection
table.
8. Reset OVP. Press the Enter key to clear the OVP error.
9. Set the OVP threshold to 25% of full-scale output voltage and repeat step 5 through step 7.
10. Set the OVP threshold to 50% of full-scale output voltage and repeat step 5 through step 7.
11. Set the OVP threshold to 75% of full-scale output voltage and repeat step 5 through step 7.
12. Set the OVP threshold to 90% of full-scale output voltage and repeat step 5 through step 7.
B-26
Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
(on page B-19)).
Check DC voltage setting
077114601 / March 2019