Test Considerations
For optimum performance, all verification procedures should comply with the following:
l
Fixed mode operation is required for all verification procedures.
l
Ambient temperature is stable, within 23 °C ±2 °C.
l
Ambient relative humidity is less than 80%.
l
30 minute warm-up period before verification or adjustment.
l
Cables as short as possible, twisted or shielded to reduce noise.
l
The UUT is allowed to be off for up to 5 minutes after the initial 30 minute warmup period to recon-
figure the output without observing the 30 minute warm-up period again.
Verification Procedure
Voltage Programming and Readback Accuracy
This test verifies that the voltage programming and measurement functions are within specifications.
Step 1. Turn off the unit under test. Only connect the DMM to the sense screws (see Test Setup A). Do
NOT connect the load unit.
Step 2. Turn on the unit under test and program the instrument settings as described in the test record
form under “Voltage Programming & Readback Min”. Turn the output on. The output status should be
“CV”, with the output current close to zero.
Step 3. Record the output voltage reading from the DMM (Vout) and the voltage measured by the
instrument over the interface. The readings should be within the limits specified in the test record form
for the appropriate model under “Voltage Programming & Readback, Minimum voltage (Vout)”.
The next step applies the full output voltage of the unit under test to the output.
Step 4. Program the instrument settings as described in the test record form under “Voltage
Programming & Readback High”.
Step 5. Record the output voltage reading from the DMM (Vout) and the voltage measured by the
instrument over the interface. The readings should be within the limits specified in the test record form
for the appropriate model under “Voltage Programming & Readback, High voltage (Vout)”.
Constant Voltage Ripple and Noise
Periodic and random deviations in the output combine to produce a residual ac voltage superimposed
on the dc output voltage. This residual voltage is specified as the rms or peak-to-peak noise in the
indicated frequency range (refer to the Mainframe Characteristics section).
Step 1. Turn off the unit under test. Connect the load resistors, differential amplifier, and an
oscilloscope (ac coupled) to the output (see Test Setup B).
6 Verification and Calibration
172 Keysight MP4300 Series Operating and Service Guide
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