Keysight RP7900 Serie Guide D'utilisation Et D'entretien page 284

6 Verification and Calibration
Current Programming and Readback Accuracy
This test verifies that the current programming and measurement functions are within specifications.
Step 1. Turn off the unit under test. Connect the current shunt directly across the output terminals.
Connect the DMM directly across the current shunt (see
used in this portion of the test.
Step 2. Turn on the unit under test and program the instrument settings as described in the test record
form under "Current Programming & Readback, Min Current". The output status should be "CC", with
the output voltage close to zero. Wait 5 minutes for the temperature to settle.
Step 3. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value. (Iout). Also, record the current measured by the instrument over
the interface. The readings should be within the limits specified in the test record form under "Current
Programming & Readback, Minimum Current".
Step 4. Program the instrument settings as described in the test record form under "Current
Programming & Readback, High Current". Wait 5 minutes for the temperature to settle.
Step 5. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value.(Iout). Also, record the current reading measured by the
instrument over the interface. The readings should be within the limits specified in the test record form
under "Current Programming & Readback, High Current".
Constant Current Load Effect
This test measures the change in current resulting from a change in voltage from a short to full scale.
Step 1. Turn off the unit under test. Connect the current shunt directly across the output terminals.
Connect the DMM directly across the current shunt (see
Step 2. Turn on the unit under test and program the instrument settings as described in the test record
under "CC Load Effect". The output status should be "CC", with the output voltage be close to zero.
Wait 5 minutes for the temperature to settle.
Step 3. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value.
Step 4. Turn off the unit under test and connect the load unit between the current shunt and the
output terminals (see Test Setup
voltage rating of the unit under test.
Step 5. Set the load unit for voltage priority mode and program it to the voltage as described in the test
record under "CC Load Effect". Enable the load's output.
Step 6. Program the unit under test to the settings as described in the test record under "CC Load
Effect". Enable the output of the unit under test. The output status should be "CC". If it isn't, adjust the
load so that the output voltage drops slightly.
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Test Setup
Test Setup
B). Make sure that the voltage rating of the load unit matches the
B). Note that the load unit is not
B).
Keysight RP7900 Series Operating and Service Guide