Current Sink Capability Verification
This test checks the ability of the power supply to sink its rated negative current.
Step 1. Turn off the unit under test and connect an external source to the + and - output terminals (see
Test Setup D).
Step 2. Set the external source for voltage priority mode and program it as described in the test record
under “Current Rating (Isink)”. Turn the output of the external source on.
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 Rating (Isink)”. Turn the output on.
Step 4. Check the front panel display of the unit under test and verify that it is sinking its rated current
and has a CC status. 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 Test”.
6 Verification and Calibration
174 Keysight MP4300 Series Operating and Service Guide