KEPCO BHK-MG 200W (Full Rack) Series - Manual (Page 116)

4-2
BHK-MG (OPR) 022014
age calibration the digital voltmeter will be connected to the sense terminals (TB1, terminals 1
and 6) of the power supply. For current calibration after disconnecting all loads an appropriate
shunt resistor will be connected across the power output terminals (TB1, terminals 2 and 5) and
the digital voltmeter will be connected across the sense terminals of the shunt resistor.
NOTE: 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. Turn the unit on at least 15 minutes prior to calibration to allow for thermal stabilization. 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. 4.5 to change the pass-
word. (Press RESET or CLEAR to exit calibration.)
3. If password is correct, LCD reads
VOLTAGE CALIB
. Enter 1 for voltage calibration (see
PAR. 4.3.1), enter 0 to proceed to high current calibration. (Press RESET or CLEAR to exit
without saving calibration values.)
4. LCD reads
HIGH CURRENT CAL
. Enter 1 for high current calibration (see PAR. 4.3.3), enter
0 to proceed to low current calibration. (Press RESET or CLEAR to exit calibration without
saving values.)
5. LCD reads
LOW CURRENT CAL
. Enter 1 for low current calibration (see PAR. 4.3.2), enter 0
to proceed to next step. (Press RESET or CLEAR to exit calibration without saving values.)
6. Disconnect the external shunt when instructed by the message displayed on the LCD.
7. Press ENTER to save calibration values.
4.3.1 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 500-0.4MG, adjust for DVM reading as close to +500.00V as possible.
Press ENTER when complete and proceed to PAR. 4.3, step 4.
NOTE: The message
Can’t Adj. Full Scale
is displayed if either a load less than nomi-
nal remains connected or the shunt resistor is connected to the output terminals during
voltage calibration. If this occurs, it is necessary to press ENTER followed by RESET
to restore proper operation. Disconnect the load/shunt, then refer to PAR. 4.3, step 1 to
restart calibration.