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SIX: CALIBRATION
6.1 INTRODUCTION
This addendum describes calibration procedures for the AMREL Programmable DC Power Supply. The supply is
calibrated either through local or remote control. The following information provides calibration procedures in
local mode.
NO hardware adjustment is necessary since all calibration is accomplished by software. The software sends
calibration constants to the supply via the front panel keys. Calibration should be performed at least annually.
The four parameters that must be calibrated are output voltage, output current, readback voltage and readback
current. After all the power supply parameters are calibrated, the supply returns to normal operating condition. If
there are any errors in the calibration, cycle the power and recalibrate. All constants are saved in a non-volatile
EEPROM.
6.2 CALIBRATION CONFIGURATION
There are two configurations for calibration of power supplies. One of which would be for voltage and the second
for current.
The two pieces of equipment necessary for calibration are:
1. Precision Shunt Resistor - 0.1 ohm/10 Amp, 0.001% accuracy (for smaller current) or
0.05% accuracy (for larger current), 20ppm, 10 watts
2. DMM (DC voltage and current) - 5½ digit, 0.005% accuracy
Figure M. Voltage Calibration Configuration