C-LOGIC 8900 User Manual page 12

Power measurement of three-phase loads (for balanced
load)
1. In the case of balanced loads, the procedure for
measuring power and power factor in 3-phase 4-wire circuits
is the same as for 3-phase 3-wire circuits and it is not
necessary to use the neutral line.
2. The measured three-phase total power parameters are
total active power, total reactive power, total apparent power,
and total power factor of the three-phase circuit. The clamp
cannot perform three-phase energy measurement. In the
case of balanced loads, the measured result is accurate
while the total power error will increase the greater the power
variation.
3. Set the thumbwheel to the kW / ᴓ (three-phase) position,
wrap the first phase wire with the jawbone and connect
terminal V1, terminal V2 and terminal V3 to active phases 1,
2 and 3 respectively of the three-phase load, without
connecting the neutral.
4. After connecting the test leads properly, the clamp will
perform the measurement automatically and display the
power, voltage, current and indicate if a phase is
disconnected.
5. Press the MODE key to display the reactive power value
on the LCD screen.
6. Press the WATT key to show the apparent power, the
power factor (cosᴓ), the phase angle and the sinᴓ; Negative
power factor means that the tested load has capacitive
characteristic.
7. Press the I key and the current value, peak current and
frequency will be displayed.
8. Press the U key and the voltage value, peak voltage and
frequency will be displayed.
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9. Press the SET key for AUTO mode and press the keys
- to adjust the voltage and current measurement
ranges and then press SET again to return to normal mode.
10. After measurement. Press the HOLD key to keep the
reading on screen and press the REC / SAVE key to show
the memory location where to save it and press the SET key
to confirm and return to the main menu.
Phase sequence test
1. The clamp will automatically perform the phase sequence
test.
2. The symbol will be displayed indicating a normal
phase sequence.
3. The symbol will be indicated indicating a reverse
phase sequence.
4. The symbol will be indicated indicating that a phase
is disconnected.
5. During measurement, press the REC / SAVE key to
display the MAX and MIN values and record the results.
Then press the RS232 key to transfer the test results to
the PC via a communication cable.
Amarillo
Negro
rojo
Measurement of power and power factor of three-
phase 3-wire circuits.
1PHASE
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