Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
Appendix B: Verification
077114601 / March 2019
B-29
To check sink current readback accuracy (1 A range):
1. Set the voltmeter as follows:
a. Set to measure DC volts.
b. Set the current range to autorange.
c. Calculate the amperes (instead of volts) by multiplying the voltmeter reading result by 1/(R1),
where R1 represents the high-
accuracy 0.05 Ω shunt.
2. Check the current readback accuracy on the 1 A range.
3. Set the DUT output voltage to 0 V.
4. Set the output voltage of the DC source to 20 V, set the DC source current to 10% of the test
current. See the following table.
Equipment
10% test current (A)
50% test current (A)
100% test current (A)
DC source
0.1
0.5
1
5. Turn the DUT output on.
6. Enter the voltmeter reading/(R1 + R2) in the DC current readback accuracy table.
7. Enter the DUT current readout in the DC current readback accuracy table under the current
readout column.
8. Calculate the difference of the two measurements taken in steps 7 and 8. Enter the absolute
value of the calculated value in the difference column of the DC current readback accuracy table.
9. Increase the DUT output current to 50% of full-scale output current and repeat step 6 through
step 9.
10. Increase the DUT output current to 100% of full-scale output current and repeat step 6 through
step 9.
