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3.6.3.11
CALIBRATE SUBSYSTEM
The BOP series of power supplies support software calibration. A full calibration consist of a
voltage calibration and a current calibration. These calibration procedures include steps that
prepare the unit for series or parallel operation. Both voltage and current calibrations consist of
a zero (performed on the main channels only) and positive and negative full scale calibrations
with both internal and external references. In addition, the external reference and variable gain
are also calibrated. There are two ways to perform the calibration: locally using the front panel
keys, or remotely sending commands through the GPIB bus. These two ways cannot be com-
bined.
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 secret password (which has
been assigned to your power supply) will be provided. During the calibration, new calibration
data is computed which is than stored in the non volatile memory.
Refer to PAR. 4.2 for calibration equipment requirements.
During voltage calibration, the voltage, voltage protect and voltage readback are calibrated and
during current calibration the current, current protect and current readback are calibrated. The
normal procedure is to calibrate voltage first and then current. However, you do not have to do a
complete calibration each time. If required, you may calibrate only the voltage or the current and
then proceed to saving the calibration results. For voltage calibration all loads must be discon-
nected and the sense terminals connected to the corresponding output terminals. The digital
voltmeter will be connected to the sensing terminals (OUT S and COM S) of the power supply.
For current calibration after disconnecting all loads an appropriate shunt resistor will be con-
nected across output terminals and the digital voltmeter will be connected across the sense ter-
minals of the shunt resistor.
3.6.3.12
SYSTEM SUBSYSTEM
This subsystem controls system-level commands, including setup of the GPIB and Serial ports,
error queries, front panel setup (keyboard lockout, display illumination, and audible beeps),
passwords, command language, setup of device clear, line feed and reset, and restoring factory
calibration.
3.6.3.12.1 FORGOTTEN PASSWORDS
If the password is lost, it is possible to enable the password interface by sending
SYST:PASS:CEN POWERSUPPLIER
Once enabled, the passwords can be set to the default values
SYST:SEC:OVERRIDE
This restores the passwords to the following:
Main:
Admin2: KEPCO
Admin1: (none assigned)
3-56
DEFAULT
BOP HIPWR 080709
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