Fluke 345 FE 345 Users Manual - Page 61

(Harmonics, is the fundamental

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Power Quality Clamp Meter Measurement Function Overview The single scale display shows the waveforms at maximum magnification with the V and A scales at either side of the waveforms, as shown in the following display. eln31.bmp The measurement cursor may be positioned using the keys FG and the time (T=n ms) is indicated on moving the marker. LHarmonics Harmonics are sinusoidal voltage and current with a frequency that corresponds to an integer multiple of the fundamental of the mains (line) voltage. Any signal can be split into an infinite number of sine waves of different frequency and amplitude. The contribution of each of these individual sine waves is represented in a bar chart up to the 40th harmonic. The smaller the harmonics (starting from the 2nd harmonic, as the 1st is the fundamental), the better the power quality. Harmonics are an indication of the distortion present in the measured parameter. This is displayed as % total harmonic distortion (%THD) or distortion factor (%DF). Harmonics may be represented as a percentage of the fundamental value (%H1) or as a percentage of the measured RMS value (%RMS) (See Table 6). 47

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Power Quality Clamp Meter
Measurement Function Overview
47
The single scale display shows the waveforms at maximum magnification with
the V and A scales at either side of the waveforms, as shown in the following
display.
eln31.bmp
The measurement cursor may be positioned using the keys
FG
and
the time (T=
n
ms) is indicated on moving the marker.
L
Harmonics
Harmonics are sinusoidal voltage and current with a frequency that
corresponds to an integer multiple of the fundamental of the mains (line)
voltage. Any signal can be split into an infinite number of sine waves of
different frequency and amplitude. The contribution of each of these individual
sine waves is represented in a bar chart up to the 40
th
harmonic. The smaller
the harmonics (starting from the 2
nd
harmonic, as the 1
st
is the fundamental),
the better the power quality. Harmonics are an indication of the distortion
present in the measured parameter. This is displayed as % total harmonic
distortion (%THD) or distortion factor (%DF).
Harmonics may be represented as a percentage of the fundamental value
(%H1) or as a percentage of the measured RMS value (%RMS) (See Table 6).