KEPCO KLP Series (older -1200 models) Operator Manual - Manual (Page 73)

KLP 073008
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.3.2) before calibrating the unit.
A full calibration consist of a voltage calibration and a current calibration. Both voltage and cur-
rent calibrations consist of a zero and a full scale calibration.
External calibration calibrates the precise user-defined reference voltages used that will be
equivalent to full scale output when external analog programming is used.
NOTE: Calibrating the unit resets all internal memory locations used for saving active settings
(*SAV, *RCL), programmed sequences using the LIST commands, and trigger levels
established by CURR:TRIG and VOLT:TRIG. These parameters are returned to the
default minimum (0V, minimum A).
In order to enter the calibration mode the correct calibration access code (password) must be
entered. If the password has been forgotten, call the factory and a special password (which has
been assigned to your power supply) will be provided. During the calibration, new calibration
data is computed which is then stored in the nonvolatile memory either when EXIT is executed
(local mode, PAR. 4.3.4) or SAVE Calibration is executed (remote mode, PAR 4.4.4).
Calibration of the BOP is performed in one of two ways: locally using the front panel controls
(PAR. 4.3), or remotely using the graphical interface supplied with the instrument driver avail-
able at www.kepcopower.com/drivers.htm (PAR. 3.5.2). This VISA compliant driver works with
many GPIB cards from suppliers like National Instruments and Hewlett-Packard. These three
ways cannot be combined. Separate calibration procedures are provided for units connected in
series or parallel.
4.2 EQUIPMENT REQUIRED
The following equipment is required to calibrate the KLP Power Supply.
• Digital Voltmeter (DVM) with 6 digits resolution an at least 0.002% accuracy for d-c mea-
surements.
• 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).
NOTES: • Because the voltage measured will be used as reference for calibration, the DVM
used must be accurately calibrated prior to calibrating the power supply.
• Proper cooling of the external precision shunt resistor ensures the accuracy of the
calibration.
4.3 CALIBRATION USING FRONT PANEL CONTROLS IN LOCAL MODE
For voltage calibration all loads must be disconnected and the sense terminals connected to the
corresponding output terminals. The digital voltmeter will be connected to the output of the
power supply. For current calibration after disconnecting all loads an appropriate shunt resistor