Current Calibration; Voltage Regulation - Xantrex XPH 75-2D Operating Manual

Current Calibration

Switch output OFF. Set output voltage to nominally 2V. Set current control to minimum. Connect
the DMM (set to Amps) and load in series across the output. Switch output ON.
Adjust VR8/108 (offset compensation of current control error amp) for a reading of 0.003A
± .001A on the DMM. Check that the CC LED is ON.
Increase voltage controls and current control to maximum. Adjust load until the DMM reads 2.00A
± 0.02A. Adjust VR7/107 (measured output current) until the Amps display matches the DMM
reading.
Reduce load until the CC LED is ON. Adjust VR4/104 (maximum output current) until the Amps
display shows 2.05.

Voltage Regulation

Connect the DMM (set to Volts) across the output, no load, output ON.
Adjust voltage controls for a reading of 18.xxxx on the DMM; note exact reading.
Connect load, set current control to maximum and adjust load for 2A output current. Note that the
DMM should be connected at the 'back' of the output terminals, closest to the internal sense
connection, and the load plugged in to the 4mm sockets of the terminals. Adjust VR9/109
(differential voltage gain) until the external DMM matches the previous reading exactly.
Mode B (75V/4A)
With both outputs OFF select Mode B (75V/4A). Set the voltage and current controls to maximum
and check that the current display (preset maximum current) reads ≥ 4.05 Amps. Connect the
rheostat, switch the output ON and adjust the load until the CC LED is just ON; check that the
current display (measured output current) matches the preset current ± 0.05 Amps.
Mode C (150V/2A)
With no loads connected and both outputs OFF select Mode C (150V/2A). Switch the output ON
and check that the reading on the Volts display (measured output volts) is ≥ 150.1V. Switch the
output OFF and adjust VR111 to give the same reading on the Volts display (preset output volts).