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SDS5000X Series Digital Oscilloscope User Manual
27.2 Power Quality
The specific measurement parameters of power quality analysis include active
power, apparent power, reactive power, power factor, power phase angle,
voltage effective value, current effective value, voltage crest factor and current
crest factor of power input of a switching power supply.
Type
Power—includes all the items to describe energy flow in a system: Active power,
reactive power, apparent power, power factor and power phase angle.
P: Active Power =
S: Apparent Power = Vrms * Irms
Q: Reactive Power =
Power Phase Angle: Phase difference between voltage and current
Power Factor, which is the ratio of active power and apparent power.
Voltage Crest -- voltage parameters of the power input, include voltage crest,
voltage effective value and voltage crest factor.
Vrms =
V_Crest = Vpeak / Vrms
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