M550221-01 Rev U 4-1
SECTION 4
CALIBRATION AND VERIFICATION
4.1 Introduction
This section provides calibration and verification procedures for the SGI Series
power supplies and the Remote Isolated Analog Interface control (option).
Refer to the SG Programming Manual for calibration of display readback and
remote digital programming option.
4.1.1 Calibration and Verification Cycle
Annual calibration and verification is recommended. Calibrate only as needed.
4.1.2 Preparation
WARNING!
Hazardous voltages exist at the rear of the supply. Care must be
taken to avoid contact with the AC input and DC output terminals.
Only authorized personnel should perform this procedure.
Only technically trained personnel, who understand the operation of the power
supply and are capable taking accurate readings should perform calibration.
The calibration procedures require two digital multimeters and a precision
shunt for measurement of voltage and current. To set up for the calibration
procedures, perform the following initial steps:
1. Disconnect AC mains power.
2. Connect a precision current shunt, that is suitably derated, across the output of
the power supply; a fan might be required to cool the shunt. Connect remote
sense leads, and ensure that the digital voltmeter that measures output
voltage is connected across the sense leads.
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