13.3 Measurement Specifications
178
RMS current (Irms)
Measurement method AC+DC True RMS type
IEC61000-4-30 compliant: 10 cycles (50 Hz) or 12 cycles (60 Hz) (approx. 200 ms aggregation)
During 400 Hz measurement, 200 kHz sampling at 80 cycles (approx. 200 ms aggregation)
Includes zero suppression.
Sampling frequency 200 kHz
Displayed item RMS current for each channel and AVG (average) RMS current for multiple channels
(for more information, "13.10 Calculation Formula" (p.198))
Measurement range, resolution See input specifications.
Measurement band See RMS frequency characteristics.
Measurement accuracy When the measurement frequency is set to 50/60 Hz: 0.2% rdg.0.1%f.s. + clamp sensor accuracy
When the measurement frequency is set to 400 Hz: 0.2% rdg.0.6%f.s. +clamp sensor accuracy
Event threshold 0 to current range
Sense 0 to current range
Event IN Start of approx. 200 ms aggregation in which threshold was exceeded
Event OUT Start of approx. 200 ms aggregation in which reading was less than (threshold - hysteresis)
Multiple-phase system treatment Separate by channel
Saved waveforms Event waveforms
Current DC value (Idc)
Measurement method Average value during approx. 200 ms aggregation synchronized to reference channel (CH4 only)
Includes zero suppression.
Sampling frequency 200 kHz
Displayed item Current DC value
Measurement range, resolution Varies with clamp sensor used (CH4 only).
Measurement band See RMS frequency characteristics and consider clamp sensor measurement band.
Measurement accuracy 0.5% rdg.0.5%f.s. + clamp sensor specifications accuracy
Not specified when using AC dedicated clamp sensor.
Event threshold 0 to (rated current of clamp sensor being used × 4) A
The difference between the positive and negative waveform peak values in the 200 ms aggrega-
tion is compared to the threshold to generate DC fluctuation events.
Sense 0 to current range
Event IN Start of the 200 ms aggregation in which the threshold was exceeded
Event OUT Start of the first 200 ms aggregation after the IN state in which the threshold was not exceed
Multiple-phase system treatment None
Saved waveforms Event waveforms
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