4.2 Changing Measurement Settings
66
PF/Q/S calculation
Select the method for calculating power factor (PF), reactive power (Q), and appar-
ent power (S).
See: 12.5, "Calculation Formulas" (p. 201)
RMS calculation is generally used in applications such as checking transformer
capacity, but fundamental wave calculation is used when measuring power factor
and reactive power, which are related to electricity fees.
Selection
RMS values
calculation
Uses voltage and current RMS values to calculate the
power factor, reactive power, and apparent power.
• Power factor PF (RMS power factor)
• Reactive power Q (calculated from RMS values)
• Apparent power S (calculated from RMS values)
Fundamental
wave
calculation
Uses voltage and the current fundamental wave to calcu-
late the power factor, reactive power, and apparent power.
• Power factor DPF (displacement power factor)
• Reactive power Q (fundamental wave reactive power)
• Apparent power S (fundamental wave apparent power)
This is the same measurement method as is used by
reactive-power meters installed at large electricity con-
sumers’ facilities. The value will be close to that obtained
when using the 3169-20/21 Clamp on Power HiTester’s
“Use reactive power measurement method” option.
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