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Chapter 2 Measurement Procedure
P
U, I
P
vAr, Q
S
U, I
S
vAr, Q
NOTE
NOTE
2.4.3 Phase Detection
5. Pressing the
MODE
key in active power or
apparent power display mode indicates reactive
power. Pressing the
MODE
key again restores the
current and voltage display.
6. Switch between Auto Range and Manual Range, as
needed. For details, see 2.3, "Range Setup."
The 3φ PF meter calculates P, Q and S under a
balanced load.
The 3φ PF meter cannot provide accurate
measurement results under an unbalanced load.
For a missing phase, the unit will not display any
measured value. ("----" will be displayed.)
If the arrow mark on the surface of the clamp
sensor points to the power supply side from the load
side, the phase will be shifted by 180 degrees, thus
disabling measurement. ("----" will be displayed.)
Press the
LINE/HARM
key to select the 3φ PF
meter (RST goes on). Before starting measurement,
check the connections. (See 2.2, "Connections.")
In a three-phase measurement, the unit will display
phase detection results as follows:
Normal phase
Reverse phase
Missing phase
If a load is connected to the electrical line while a
phase is missing on the power supply side, voltage
coming back from the load to the tester may cause
normal or reverse phase to be displayed even though
a phase is missing.
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