Keysight RP7900 Serie Guide D'utilisation Et D'entretien page 285

6 Verification and Calibration
Step 7. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value. The difference in the current reading in step 3 is the load effect,
which should not exceed the value specified in the test record for the appropriate model under "CC
Load Effect".
Current Sink Capability Verification
This test checks the ability of the power supply to sink up to 100% of its rated output current.
Step 1. Turn off the unit under test and connect the RP79xxA as an external source to the + and -
output terminals (see Test Setup C). Make sure that the voltage rating of the RP79xxA source matches
the voltage rating of the unit under test.
Step 2. Set the RP79xxA external source as follows: Voltage setting = 50 % of the rated output voltage
of the unit under test. Current limit setting = 110% of the rated output current of the unit under test.
Step 3. Turn on the unit under test. Set the operating mode to current priority. Program the instrument
settings as described in the test record under "Current Sink Verification".
Step 4. Check the front panel display of the RP79xxA source and verify that the supply is sinking 100%
of its rated current. Divide the voltage drop (DMM reading) across the current shunt by the shunt
resistance to convert to amps and record this value. The readings should be within the limits specified
in the test record form under "Current Sink Tests".
Keysight RP7900 Series Operating and Service Guide 285