KEPCO KLP Series User Manual, Rev 4 - Manual (Page 81)

KLP 091313
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 addition, values for full scale voltage and current
in INVC registers (ANPR and ANRB default values) are set to 10V.
In order to enter the calibration mode the correct unit password must be entered. If the pass-
word 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 KLP 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 VXI plug&play instrument
driver available at www.kepcopower.com/drivers/ (PAR 4.4)). The VISA compliant VXI
plug&play driver works with many GPIB cards from suppliers such as National Instruments and
Hewlett-Packard. These two ways cannot be combined.
NOTE: Calibration of a master/slave configuration requires that both units be restored to
standalone operation (see PAR. 3.2.14.4 for instructions) and calibrated individually.
4.2 EQUIPMENT REQUIRED
The following equipment is required to calibrate the KLP 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.
• A stable, clean d-c power source capable of supplying 10.0000V (or other desired full
scale analog voltage) at 10mA minimum (a linear power supply or reference voltage I.C.
is recommended).