Kikusui PCZ1000A, Operation Manual, Page: 64 / 100

3-30
PCZ1000A
3.7.4 Calibration of the Ammeter on the Master Unit During
Parallel Operation
The ammeter of the PCZ1000A when used for parallel operation is calibrated at the
shipment from the factory. However, the ammeter accuracy can be improved further
by calibrating the instrument under the actual parallel operation conditions
Preparation for Calibration
• To minimize the measurement error due to startup drift, allow the current to
flow for 30 minutes before starting the test. Also, maintain the ambient
temperature at 23
°
C ± 5
°
C.
• Equipment
AC power supply: An AC power supply with adequate capacity to supply the
combined requirements of all the instruments.
Output current (RMS): Number of units x 10 A
Output current (peak): Number of units x 40 A
Output voltage (RMS): 10 V
AC ammeter:
A meter with sufficient range to measure an RMS current of number
of units x 10 A and a peak current of number of units x 40 A.
Accuracy 0.5 % or better, frequency: 45 Hz to 65 Hz.
Fig.3-11 Wiring Diagram for Calibration
PARALLEL IN
PARALLEL IN
PARALLEL OUT
PARALLEL OUT
L
L
L
L
N
N
N
G
G
G
N
G
AC ammeter
AC voltmeter
AC power
supply
Flat cable
Master
Slave
Slave
A
V