KEPCO BHK-MG 40W (Half Rack) Series - Manual (Page 114)

4-2
BHK-MG 1/2 OPR 121313
then proceed to saving the calibration results. For either voltage or current calibration, BOTH
zero AND full scale calibrations must be performed.
For both current and voltage calibration all loads must be disconnected from the power supply
output; the sense terminals must be connected to the corresponding output terminals. For volt-
age calibration the digital voltmeter will be connected to the output of the power supply. For cur-
rent calibration after disconnecting all loads an appropriate shunt resistor will be connected
across output terminals and the digital voltmeter will be connected across the sense terminals of
the shunt resistor.
4.4 CALIBRATION USING FRONT PANEL KEYS
NOTES: Keys with dual functions are labeled with both a command and a number. The com-
mand label is referred to when the unit is in
(:_:_:)
command entry status; the num-
ber is referred to when the unit is in
(=_=_=)
data entry status.
1. With the power supply in command entry status
(:_:_:)
, press CALIB key. Power supply
enters Calibration mode and data entry status
(=_=_=)
waiting for the password to be
entered.
2. Enter password (4 digits) and press ENTER. If password is incorrect,
**WRONG PASS-
WORD**
flashes, then LCD returns to command status. See PAR. 4.6 to change the pass-
word. (Press RESET or CLEAR to exit calibration without changing password.)
3. If password is correct, LCD reads
VOLTAGE CALIB
. Enter 1 for voltage calibration (see
PAR. 4.4.1), enter 0 to proceed to current calibration. (Press RESET or CLEAR to exit with-
out saving calibration values.)
4. LCD reads
CURRENT CAL
. Enter 1 for current calibration (see PAR. 4.4.2), enter 0 to pro-
ceed to next step. (Press RESET or CLEAR to exit calibration without saving values.)
5. Disconnect the external shunt when instructed by the message displayed on the LCD.
6. LDS reads
DATE: --/--/----
. Enter date in MM/DD/YYYY format where MM = month,
DD = day, YYYY = year.
7. Press ENTER to save calibration values.
4.4.1 VOLTAGE CALIBRATION
CAUTION: Power supply output must be disconnected from any load and isolated from ground
before proceeding.
1. With LCD reading
VOLTAGE CALIB. Connect DVM.
, connect DVM (+) input to output (+)
terminal and DVM (–) input to output (–) terminal of power supply. then press ENTER.
2. With LCD reading
Vout ZERO adj.
, monitor DVM and use or keys to increase or
decrease output voltage as necessary to get DVM reading the minimum positive value.
Press ENTER when complete.
3. LCD will flash
Vout F.S.adj. **WAIT**
then
Vout F.S. adj < >
. Monitor DVM and
use or keys for fine adjustment and 3 or 1 keys for coarse adjustment to increase or
decrease output voltage as necessary to get DVM reading as close as possible to full scale
value. E.g., for BHK 500-80MG, adjust for DVM reading as close to +500.00V as possible.
Press ENTER when complete and proceed to PAR. 4.3, step 4.