13.3 Measurement Specifications
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Chapter 13 Specifications
Voltage waveform comparison (Wave)
Measurement method A judgment area is automatically generated from the previous 200 ms aggregation waveform, and
events are generated based on a comparison with the judgment waveform. Waveform judgments
are performed once for each 200 ms aggregation.
Comparison window width 10 cycles (50 Hz), 12 cycles (60 Hz), or 80 cycles (400 Hz)
No. of window points 4,096 points synchronized with harmonic calculations
Displayed item Event detection only
Event threshold 0.0% to 100.0% of nominal voltage RMS value
Event IN First time at which waveform diverges from judgment area
Event OUT None
Multiple-phase system treatment Separate by channel
Saved waveforms Event waveforms
Inrush current (Irms1/2 , Inrush)
Measurement method Detected using the current RMS Irms 1/2.
For 400 Hz measurement, inrush current is detected when the maximum of 4 RMS current values
existing within the same 10 ms period (calculated values for one 400 Hz waveform) is greater than
the threshold in the positive direction.
Displayed item Maximum RMS current Irms 1/2 current
Measurement range, resolution Varies with clamp sensor used (see input specifications).
Measurement accuracy Same as RMS current refreshed each half-cycle Irms 1/2
Event threshold Varies with set range.
Event IN Time at the start of each channel's voltage half-cycle waveform for which the RMS current re-
freshed each half-cycle exceeded the threshold
Event OUT Time at the start of the voltage half-cycle waveform in which the RMS current refreshed each half-
cycle exceeded (threshold - hysteresis) in the negative direction
Multiple-phase system treatment None
Saved waveforms Event waveforms
Fluctuation data With a measurement frequency of 50/60 Hz:
RMS current Irms 1/2 values are saved from 0.5 s before to 29.5 s after the event.
With a measurement frequency of 400 Hz:
RMS current Irms 1/2 values are saved from 0.125 s before to 7.375 s after the event.
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