Carlo Gavazzi WM4-96 - Manual (Page 82)

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Technical features
User’s page
77
Software functions
72
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Harmonic analysis
Analysis principle: FFT.
Harmonic measurement: current, up to the 50th harmonic;
voltage, up to the 50th harmonic.
Type of harmonics:
THD (V
L
1) THD odd (V
L
1) THD even (V
L
1).
The same is for the other phases:
L2, L3. THD (A
L
1) THD odd (A
L
1) THD even (A
L
1).
The same is for the other phases: L2, L3.
Harmonic phase angle: the instrument measures the angle
between the single harmonic of “V” and the single harmon-
ic of “I” of the same order. According to the value of the
electrical angle, it is possible to know if the distortion is
absorbed or generated.
Note: if the system has 3 wires the angle cannot be measured.
Harmonic details: the harmonic contents is displayed as a
graph showing the whole harmonic spectrum.
This value is also given as a numerical information:
THD % / RMS value; THD odd % / RMS value; THD odd % /
RMS value / single harmonics in % / RMS value.
System: the harmonic distortion can be measured in single-
phase, 3-wire or 4-wire systems. Tw: 0.02.