Fluke 43B, Инструкция по применению

Страница: 37 / 84

Lighting Loads
Measuring Power on Single Phase Loads
3
33
Measuring Power on Single Phase Loads
Inductive loads, such as fluorescent lamps, cause a phase shift between the
voltage and the current. This influences the real power consumption.
1
Open the main menu.
2
3
Make connections as shown below:
Look at the W reading. It shows the real power consumption of the lights.
Look at DPF (cos
ϕ
) reading. Low DPF means that corrective measures
have to be taken such as installing capacitors to correct the phase shift
between the voltage and the current.
Note
If PF and DPF differ greatly, this indicates the presence of
harmonics. Check for harmonics first, before installing capacitors.
POWER