Kikusui PCZ1000A, Operation Manual, Page: 30 / 100

2-10
PCZ1000A
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Load wire inductance
If the load wire is long or has a large loop, the wire inductance is increased.
In such condition, the input voltage may fall below the minimum operating voltage
of the PCZ1000A causing the current waveform to be distorted. In some cases, the
input voltage may exceed the maximum input voltage and cause damage to the
PCZ1000A. The phase lag of the current may cause instability in the PCZ1000A
control inducing oscillation.
Connect the PCZ1000A and the equipment under test using the shortest twisted wire
possible to keep the voltage caused by inductance within the minimum operating
voltage and maximum input voltage rauge.
A capacitor may be connected to the load input terminual as shown in Fig.2-6 to
alleviate oscillation. In this case, use the capacitor within its allowable ripple
current.
Fig.2-6 Wiring Length
Overvoltage
• Risk of damage to the instrument. The maximum input voltage is 400
Vpeak. Do not apply voltages exceeding the maximum voltage of 400
Vpeak to the load input terminals.
The maximum voltage that can be applied to the load input terminals is 400 Vpeak.
The PCZ1000A cannot be used with voltages higher than this.
If an excessive voltage is applied, an alarm will be displayed, a warning sounded,
and the load disconnected. Please reduce the voltage of the equipment under test.
Other Precautions
• The L and N load input terminals are connected internally through
0.01 μF capacitors to the G terminal (case) on the PCZ1000A to filter
noise from the equipment under test. Thus, if one end of the output
terminals of the equipment under test (EUT) is grounded, a small leak
current (approx. 1 mA max.) will flow from the output terminals to the
PCZ1000A case (ground). However, when operating a number of
PCZ1000As in parallel, the maximum leak current will be multiplied by the
number of PCZ1000As.
Equipment
under test
PCZ1000A
Short, 100 cm or less
Twist
L
C
Example: C=0.1 μF to 0.47 μF
N
CAUTION
CAUTION