13.3 Measurement Specifications
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Chapter 13 Specifications
Power factor and displacement power factor (PF, DPF)
Measurement method Power factor : Calculated from RMS voltage U, RMS current I, and
active power P.
Displacement power factor : Calculated from the phase difference between the
fundamental voltage wave and the fundamental current wave.
Lag phase (LAG: current lags voltage) : Unsigned
Lead phase (LEAD: current leads voltage) : Negative
DPF values for all channels (excluding sum values) during 3P3W2M and 3P3W3M connections
are undefined.
Sampling frequency 200 kHz
Displayed item Displacement power factor of each channel and its sum value for multiple channels. (For details,
see "13.10 Calculation Formula" (p.198).)
Measurement range, resolution -1.0000 (lead) to 0.0000 to 1.0000 (lag)
Measurement band See RMS frequency characteristics and consider clamp sensor measurement band
Measurement accuracy -
Event threshold 0.000 to 1.000
Event IN Start of approx. 200 ms aggregation in which the absolute value was less than the threshold
Event OUT Start of the approx. 200 ms aggregation in which the reading was greater than (absolute value +
hysteresis) following the EVENT IN state
Multiple-phase system treatment Separate by channel
Saved waveforms Event waveforms
Voltage unbalance factor (negative-phase unbalance factor, zero-phase unbalance factor) (Uunb, Uunb0)
Measurement method Calculated using various components of the three-phase fundamental voltage
wave (line-to-line voltage) for three-phase 3-wire (3P3W2M, 3P3W3M) and three-phase
4-wire connections. (For details, see "13.10 Calculation Formula" (p.198))
Sampling frequency 200 kHz
Displayed item Negative-phase unbalance factor (Uunb), zero-phase unbalance factor (Uunb0)
Measurement range, resolution Component is V and unbalance factor is 0.00% to 100.00%.
Measurement band See "13.10 Calculation Formula" (p.198).
Measurement accuracy When the measurement frequency is set to 50/60 Hz 0.15%
(0.0% to 5.0% range specified for IEC61000-4-30 performance testing)
Event threshold 0.0% to 100.0%
Event IN Start of approx. 200 ms aggregation in which reading was greater than the threshold
Event OUT Start of approx. 200 ms aggregation in which the reading was less than (threshold - hysteresis)
Multiple-phase system treatment None
Saved waveforms Event waveforms
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