Keithley 2280 Series - Check DC Current Accuracy; DC Overvoltage Protection

Series 2280 Precision DC Power Supply Reference Manual Appendix B: Verification
077085503 / March 2019 B-29
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 (on
page B-8) 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.
Check DC current accuracy
Equipment required
AC power source
High current 18 AWG wire
Electronic load
High accuracy 0.05 Ω resistor
DC voltmeter
Current shunt resistor cabling
Set up the equipment as shown in the following figure.
Make sure the warm-up criteria have been met, as described in Performance verification conditions.
Figure 107: DC current accuracy and regulation test setup