KEPCO ATE 100-10DMG, Operator'S Manual, Page: 65 / 98

ATE-DMG 020613
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.3.4) 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. 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 combined.
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 then stored in the nonvolatile memory.
4.2 EQUIPMENT REQUIRED
The following equipment is required to calibrate the ATE-DMG Power Supply.
• Digital Voltmeter (DVM) with 6 digits d-c accuracy.
• Shunt Resistor: During the calibration procedure the LCD displays the minimum require-
ments for the shunt resistor. However, to avoid problems due to drift caused by heat dis-
sipation at higher power levels, Kepco recommends the items listed in Table 4-1
NOTE: Because the voltage measured will be used as reference for calibration, the DVM used
must be accurately calibrated prior to calibrating the ATE-DMG power supply.
4.3 CALIBRATION PROCEDURES
During voltage calibration, the voltage, overvoltage and voltage readback are calibrated and
during current calibration the current, overcurrent and current readback are calibrated. The nor-
mal 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 either voltage or current calibration, BOTH
zero AND full scale calibrations must be performed.
TABLE 4-1. SUGGESTED SENSE RESISTORS
MODEL VALUE KEPCO PART NO. MANUFACTURER MANUFACTURER PART NO.
ATE 6-100DMG
ATE 15-50MG
ATE 25-40MG
ATE 35-30MG
0.001 OHM 115-3033 ISOTEK RUG-Z-R001-0.1 TK10
ATE 55-20MG
ATE 75-15MG
ATE 100-10MG
ATE 150-7MG
0.01 OHM 115-2997 ISOTEK RUG-Z-R010-0.1 TK10
NOTE: ALL SENSE RESISTORS MUST BE MOUNTED ON A HEATSINK WITH A MINIMUM SURFACE AREA OF 36 SQUARE
INCHES TO MAINTAIN THERMAL STABILITY DURING CALIBRATION; FORCED CCOOLING IS RECOMMENDED.
KEPCO HEATSINK P/N 136-0451 WILL PROVIDE ADQUATE COOLING FOR THE SENSE RESISTOR.