13.3 Measurement Specifications
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Chapter 13 Specifications
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RMS current refreshed each half-cycle (Irms1/2)
Measurement method IEC61000-4-30 compliant
When the measurement frequency is set to 50/60 Hz, the RMS current is calculated using current
waveform data sampled every half-cycle (synchronized to the voltage of the channel in question).
When the measurement frequency is set to 400 Hz, the RMS current is calculated for the current
waveform once each cycle.
Sampling frequency 200 kHz
Displayed item RMS current refreshed each half-cycle
Measurement range, resolution Varies with sensor used (see input specifications).
Measurement band See RMS frequency characteristics.
Measurement accuracy When the measurement frequency is set to 50/60 Hz: 0.3% rdg.0.5%f.s. + clamp sensor accuracy
When the measurement frequency is set to 400 Hz: 0.4% rdg.1.0%f.s. +clamp sensor accuracy
Event threshold See inrush current.
Event IN See inrush current.
Event OUT See inrush current.
Multiple-phase system treatment See inrush current.
Saved waveforms See inrush current.
Other Generates events as inrush current.
Swell (Swell)
Measurement method IEC61000-4-30 compliant
During 50/60 Hz measurement, a swell is detected when the RMS voltage refreshed each half-
cycle exceeds the threshold in the positive direction.
During 400 Hz measurement, a swell is detected when the maximum of 4 RMS voltage values oc-
curring within 10 ms (values calculated for one 400 Hz waveform) exceeds the threshold in the
positive direction.
Sampling frequency 200 kHz
Displayed item Swell height: Worst value for RMS voltage refreshed each half-cycle [V]
Swell duration: Period from the time a U1 to U3 swell is detected until the reading exceeds the val-
ue obtained by subtracting the hysteresis from the threshold in the negative direction
Measurement range, resolution 600.00 V
Measurement band See RMS frequency characteristics.
Measurement accuracy Same as for RMS voltage refreshed each half-cycle
Within half a cycle of the start accuracy time, within half a cycle of the end accuracy time (not spec-
ified for 400 Hz measurement)
Event threshold Percentage of the nominal voltage or percentage of the slide reference voltage (user-selectable)
Event IN Start of the waveform for which the RMS voltage refreshed each half-cycle exceeded the threshold
in the positive direction
Event OUT Start of the waveform for which the RMS voltage refreshed each half-cycle exceeded the value
obtained by subtracting the hysteresis from the threshold in the negative direction
Multiple-phase system treatment Starts when any of the U1 to U3 channels experiences a swell and ends when the swell has ended
for all channels.
Saved waveforms Event waveforms
Fluctuation data RMS data refreshed each cycle is saved from 0.5 s before to 29.5 s after the EVENT IN. When set
to 400 Hz, RMS data refreshed each cycle is saved from 0.125 s before to 7.375 s after.
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