Calibration Adjustment - Protek 3003B Instruction Manual

5. CALIBRATION ADJUSTMENT

ADJUSTMENT OF THE RATING VOLTAGE.
a) Connect digital multimeter across output terminals of supply and set the DC volt position.
b) Turn on supply and push on DC OUT push button switch.
c) Adjust voltage controls (COARSE, FINE) fully clockwise.
d) Adjust S203 for a reading of rate volts x 1.05 on the digital multimeter.
e) Adjust S401 until digital multimeter reads exactly maximum rated
output voltage.
f) Push-off DC OUT push button switch and adjust S202 until front panel meter reads exactly digital
multimeter reading.
ADJUSTMENT OF THE RATING CURRENT
a) Connect load resistor and digital multimeter with series and set the range to DC 20 Amp position.
b) Turn on supply.
c) Adjust voltage controls and current control to minimum (fully counter-clockwise).
d) Adjust S201 for reading of 0 Amps on the digital multimeter.
e) Adjust voltage controls and current control to maximum (fully clock-wise).
f) Adjust S501 until front panel meter reads exactly digital multimeter reading.
g) Push on CC SET push button switch.
h) Adjust S204 until digital multimeter exactly the maximum rated output current.