Appx.12
Event Detection Methods
Frequency (1 wave)
Measurement method (Reciprocal method)
Frequency for every U1 (reference channel) waveform.
Approx. 200 ms aggregation
Frequency
(1 wave)
Frequency
(1 wave)
Event IN and OUT
Event IN Time when a frequency exceeds the positive threshold value or falls below
the negative threshold value
Event OUT Time when a frequency falls below the value calculated by subtracting 0.1 Hz
from the positive threshold value or exceeds the value calculated by adding
0.1 Hz to the negative threshold value
(Equivalent to a frequency hysteresis of 0.1 Hz)
Voltage total harmonic distortion, Current total harmonic distortion
Measurement method
Measured values are calculated for a rectangular window of 2 048 points over the approximately
200-ms (10/12-cycle for 50 Hz / 60 Hz, respectively) aggregation. Events are detected when the
calculated values are greater than or less than the corresponding threshold value.
50 Hz: 10 waveforms, 60 Hz: 12 waveforms
Harmonic calculation using rectangular window
Event IN and OUT
Event IN Starting time of an approximately 200-ms aggregation period to whicha
value belongs when it exceeds the threshold value
Event OUT Starting time of an approximately 200-ms aggregation period to which a
value belongs when it falls below the value calculated by subtracting the
hysteresis from the threshold value
Event IN
Event OUT
Hysteresis
Threshold
Harmonic distortion
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