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Step 4. Adjust the oscilloscope for a waveform similar to that shown in the following figure.
Step 5. The output voltage should return to within the specified voltage at the specified time after the
load change. Check both loading and unloading transients by triggering on the positive and negative
slope. Record the voltage at time "t" in the performance test record form under "Transient Response".
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
not 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
not 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
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.
Keysight RP7970 & RP7980 Series Operating and Service Guide
6 Verification and Calibration
Test Setup
B). Note that the RP79xxA load is
Test Setup
B). Note that the RP79xxA load is
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