3-17
IM 253710-01E
Before Starting Measurements
3
•
To measure the apparent power and power factor more accurately when measuring the
power of an unbalanced three-phase circuit, it is recommended that a three-voltage, three-
current (3V3A) system be used to make the measurement.
•
In 3P3W and 3V3A systems, the wiring system may be different between the PZ4000 and
another product (another digital power meter) due to the differences in the input element that
is wired. To achieve correct measurements, check the wiring system
The following wiring examples are for connecting shunt-type current sensors. When
connecting a clamp-type current sensor, replace the shunt-type current sensor with the
clamp-type. For the combinations of the elements and the input terminals in the figures
below, see “Wiring Examples” in section 3.7, “Directly Wiring the Circuit under
Measurement.”
Wiring Example of a single-phase, two-wire system (1P2W) using a shunt-type current
sensor
SOURCE
LOAD
Earth side
Shunt-type current sensor
±
I
OUT L
OUT H
Current sensor input connector
Input terminal
U
±
Wiring Example of a single-phase, three-wire system (1P3W) using a shunt-type
current sensor
SOURCE
LOAD
±
I
OUT L
OUT H
±
I
OUT L
OUT H
N
Current sensor
input connector
Input terminal 1
U
±
Current sensor
input connector
Input terminal 2
U
±
3.8 Using an External Current Sensor to Wire the Circuit under Measurement