KEPCO KLN Series (750W, 1500W, 3000W), Main Contro Firmware Version 1.70 and higher - Manual (Page 89)

KLN Series 051614
4-1
SECTION 4 - CALIBRATION
4.1 GENERAL
This section contains the calibration instructions for the Power Supply. It is recommended that
the user be familiar with Local Mode operation (PAR. 3.3) before calibrating the unit.
CAUTION: IT IS RECOMMENDED THAT CALIBRATION BE PERFORMED ONLY BY
AUTHORIZED PERSONNEL FAMILIAR WITH ELECTRONIC TEST AND CALI-
BRATION EQUIPMENT.
A full calibration consist of a voltage calibration and a current calibration. Both voltage and cur-
rent calibrations consist of a full scale calibration.
Calibration of the KLN is performed locally using the front panel controls
NOTE: Calibration of a master/slave configuration requires that both units be restored to
standalone operation (see PAR. 3.4.2 or 3.4.4 for instructions) and calibrated individu-
ally.
4.2 EQUIPMENT REQUIRED
The following equipment is required to calibrate the KLN Power Supply.
• Digital Voltmeter (DVM) with 6 digits resolution and at least 0.002% accuracy for d-c
measurements.
NOTE: Because the voltage measured will be used as a reference for calibration, the DVM
used must be accurately calibrated prior to calibrating the power supply.
• Precision Shunt Resistor (with a tolerance of 0.01%, power rating of at least 10 times
larger than the maximum stress, and a temperature coefficient equal to or better than 20
ppm per degree C).
NOTE: Proper cooling of the external precision shunt resistor ensures the accuracy of the cal-
ibration.
4.3 VOLTAGE CALIBRATION PROCEDURE
1. Turn off power supply and disconnect load from output terminals at the rear of unit.
2. Verify that power supply is configured for local error sensing (PAR. 2.5.7) and connect unit as
shown in Figure 4-1.
3. Connect DVM to points “A” of sense terminal block at the rear of power supply as shown in
Figure 4-1.