Keithley 2280 Series - DC Current Accuracy

Appendix B: Verification Series 2280 Precision DC Power Supply Reference Manual
B-30 077085503 / March 2019
To check DC current accuracy:
1. Set the voltmeter as follows:
 Set to measure DC voltage.
 Set the current range to autorange.
 Calculate the amperes (instead of volts) by multiplying the voltmeter reading result by 20 (1/R
Shunt
).
2. Set the electronic load as follows:
 Set to constant voltage.
 Set to the specified voltage for your DUT (see DC current accuracy (on page B-9)).
3. Set the DUT to 0% of the full-scale output current.
4. Set the DUT to 25% of the full-scale output voltage.
5. Turn the DUT output on.
6. Enter the voltmeter reading in the DC current accuracy (on page B-9) table.
7. Set the DUT output current to 50% of full-scale output current and repeat step 7.
8. Set the DUT output current to 75% of full-scale output current and repeat step 7.
9. Set the DUT output current to 100% of full-scale output current and repeat step 7.