13.3 Measurement Specifications
186
Total harmonic voltage and Total harmonic current distortion factor (Uthd, Ithd)
Measurement method Uses IEC61000-4-7:2002.
Max. order: 50th
Anti-aliasing low-pass filter causes attenuation of frequencies other than measurement target of at
least 50 dB.
Analysis window width 10 cycles (50 Hz), 12 cycles (60 Hz), or 80 cycles (400 Hz)
No. of window points Rectangular, 4,096 points
Displayed item THD-F (total harmonic distortion factor for the fundamental wave)
THD-R (total harmonic distortion factor for the total harmonic including the fundamental wave)
Measurement range, resolution 0.00 to 100.00%(Voltage), 0.00 to 500.00%(Current)
Measurement accuracy -
Event threshold 0.00 to 100.00%
Event IN Start of approx. 200 ms aggregation in which the absolute value was greater than the threshold
Event OUT Start of approx. 200 ms aggregation in which the reading was less than (threshold - hysteresis)
following the EVENT IN state
Multiple-phase system treatment Separate by channel
Saved waveforms Event waveforms
K Factor (multiplication factor) (KF)
Measurement method Calculated using the harmonic RMS current of the 2nd to 50th orders.
(For details, see "13.10 Calculation Formula" (p.198).)
Analysis window width 10 cycles (50 Hz), 12 cycles (60 Hz), or 80 cycles (400 Hz)
No. of window points Rectangular, 4,096 points
Displayed item K factor
Measurement range, resolution 0.00 to 500.00
Measurement accuracy -
Event threshold 0 to 500.0
Event IN Start of approx. 200 ms aggregation in which the absolute value was greater than the threshold
Event OUT Start of approx. 200 ms aggregation in which the reading was less than (threshold - hysteresis)
following the EVENT IN state
Multiple-phase system treatment Separate by channel
Saved waveforms Event waveforms
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