4.3 Making System Settings
55
THD calculation method settings
What is THD?
THD (Total Harmonic Distortion) indicates the total harmonic distortion factor.
MEASURE
THD Calc
Select from pull-
down menu
Confirm
Cancel
The selected THD calculation method is valid for both harmonic volt-
age and harmonic current.
THD_F
The ratio of total harmonics to fundamental wave.
THD_R
The ratio of total harmonics to total harmonics, funda-
mental wave included.
(THD calculation)
Power factor calculation method settings
What is a power factor?
• The PF (power factor) is the active power to apparent power ratio. Since calculations include all the fre-
quency components, the greater the harmonic current becomes, the smaller the power factor
becomes.
• The DPF (displacement power factor) is the cosine of the phase difference between the fundamental
wave voltage and the fundamental wave current. It is only calculated using fundamental wave compo-
nents and does not include harmonic wave components.
MEASURE
PF Type
Select from pull-
down menu
Confirm
Cancel
PF
Power factor
DPF
Displacement power factor
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