AMETEK Programmable Power XPH Serie Manual Del Operador página 12

Equipment Required
A 5½ digit multimeter with better than 0.05% accuracy on dc volts and better than 0.1% accuracy
on dc current (to 10A); alternatively use a precision shunt for current measurement.
Rheostat or other high power load arrangement to provide up to 10A load at 42V. 1kΩ 1%
0.25W resistor.
Voltage Calibration
Set the sense switch to local. Connect the DMM (set to Volts) across the output. Set voltage
controls to minimum and the current control to maximum. Switch output ON (Check LED is on)
and adjust the Fine volts control for a reading of 0.02V on the DMM; check the Amps display
reads 0.00A to 0.01A. Switch output OFF and adjust VR12 (preset volts – low end) for a reading
on the Volts display of 0.02V.
Switch output ON and set voltage controls to maximum. Adjust VR5 (maximum output volts) for a
reading of 42.15V to 42.25V on the DMM. Adjust VR6 (measured output volts) until the Volts
display matches the reading on the external DMM.
Switch output OFF. Adjust VR10 (preset volts – high end) until the Volts display matches the
previous reading.
Current Calibration
With output OFF, set voltage to 10.00V and connect the 1kΩ resistor across the output terminals.
With output ON, adjust VR11 until the Amps display shows 0.01A. Switch output OFF and
remove 1kΩ resistor.
Set current limit to 0.02A. Connect the DMM (set to Amps) and load in series across the output.
Switch output ON. Adjust VR8 (offset compensation of current control error amp) for a reading of
0.020A ± 0.001A on the DMM. Check that the CC LED is ON and Amps display shows 0.02A.
Increase voltage controls and current control to maximum. Adjust load until the DMM reads
10.00A ± 0.02A. Adjust VR7 (measured output current) until the Amps display matches the DMM
reading.
Reduce load resistance until the CC LED is ON. Adjust VR4 (maximum output current) until the
Amps display shows 10.1xA.
Voltage Regulation
Connect + sense to the + output terminal, connect – sense to the – output terminal. Select
Remote Sense.
Connect the DMM (set to Volts) across the sense terminals, no load, output ON.
Adjust voltage controls for a reading of 18.xxxx on the DMM; note exact reading.
Connect load of 9 to 9.9A to the output terminals and adjust VR9 (differential voltage gain) until
the external DMM matches the previous reading.
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