Hioki 3286-20, Инструкция по эксплуатации

Страница: 44 / 78

27
―――――――――――――――――――――――――――
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 3
φ
PF meter calculates P, Q and S under a
balanced load.
The 3
φ
PF meter cannot provide accurate measurement
results under an unbalanced load.
For a missing phase, the instrument 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 3
φ
PF
meter (RST goes on). Before starting measurement,
check the connections. (See 2.2, "Connections.")
In a three-phase measurement, the instrument 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.