KEPCO ABC-DM SERIES - Manual (Page 60)

4-2
ABC 040104
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 number 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, data entry status .
2. Enter password (4 digits) and press ENTER. If password is incorrect,
**WRONG PASS-
WORD**
flashes, then LCD returns to command status. (See PAR. 4.4 to change the pass-
word).
3. If password is correct, LCD reads
VOLTAGE CALIB
. Enter 1 for voltage calibration (see
PAR. 4.3.1), enter 0 to proceed to current calibration.
4. LCD reads CURRENT CALIB. Enter 1 for current calibration (see PAR. 4.3.2), enter 0 to exit
Calibration mode.
4.3.1 VOLTAGE CALIBRATION
1. With LCD reading
VOLTAGE CALIB. Connect Instr.
, connect DVM to output (+) and (–
) terminals 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 as close to zero as possible (with-
out going to negative value). Press ENTER when complete.
NOTE: During calibration the " (increase) or # (decrease) keys are used for fine adjust-
ments. If necessary, use the 1 (decrease) and 3 (increase) keys for coarse adjustment,
then use the
" or # keys.
3. LCD will flash
Vout F.S.adj. **WAIT**
then
Vout F.S. adj < >
. Monitor DVM and
use " or # keys to increase or decrease output voltage as necessary to get DVM reading
as close as possible to full scale value (without exceeding full scale value). E.g., for ABC 25-
4DM, adjust for DVM reading as close to 25.000V as possible. Press ENTER when com-
plete. If the
" and # keys do not provide the required adjustment range, press the 1
(increase) or 3 (decrease) key for additional range.
4.3.2 CURRENT CALIBRATION
1. LCD reads
CONNECT SHUNT zz A
(n and zz values are determined by ABC
model being calibrated.; e.g., for ABC 10-10DM LCD reads <1 OHM, >50 W). Refer to PAR.
4.2 for shunt requirements. Press ENTER.
2. LCD reads
CONNECT DVM TO SHUNT
. Connect Precision Shunt across output (+) and (–)
terminals of power supply and connect DVM to sense terminals of shunt. Press ENTER
when connections are complete.
NOTE: During calibration the " (increase) or # (decrease) keys are used for fine adjust-
ments. If necessary, use the 1 (decrease) and 3 (increase) keys for coarse adjustment,
then use the
" or # keys.
3. With LCD reading
Iout ZERO adj.
, monitor DVM and use " or # keys to increase or
decrease output current as necessary to get DVM reading as close to zero as possible (with-
out going to negative value). Press ENTER when complete.