Appendix C: Calibration and adjustment
Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
C-18
077114601 / March 2019
High-sink current calibration
Connect the instrument with the digital multimeter (DMM), precision shunt resistor, and electronic load
(or resistor). For details, see
Current calibration connections
(on page C-8).
Perform the following steps to finish the high-sink-current calibration:
Steps 11 and 12: Sink-current calibration on the 1 A and 10 A ranges
You must input the measured value from the DMM. The value should be within the expected range.
A message will indicate if the DMM data entry was out of the expected range. Verify that the proper
shunt value was used or that the cables are properly connected.
For 2281S, the expected values are shown in the following table.
Steps
Maximum voltage
Minimum voltage
11
-5e
-4
V
-1.75e
-2
V
12
-0.01 V
-0.25 V
Make sure that cables, shunts, and loads are properly rated for the intended current. Incorrect
shunt connections can cause damage.
Step 11
1. Before starting this calibration step, configure the shunt and power supply as shown in the
following table.
Model
Shunt
Power supply
2281S
0.05 Ω
Constant current mode
5.0 V
0.06 A
2. Enter the external shunt value and press the
ENTER
key.
3. Enter the measured result from the digital multimeter (DMM) and press the
ENTER
key.
4. After entering the data, the waiting window is displayed. You need to wait a few seconds for the
internal measurements and calculations. The step 12 calibration window is displayed.
