3-35
CH 3/ Real Time Data
Harmonic Options
Harmonic/
Interharmonic
data plots
The voltage and current harmonics and/or interharmonics for each phase channel can
be trended using the Options button. The properties specified under Harmonic Options
apply when harmonic/interharmonic data is viewed in either graph or tabular form.
Properties under Calculate Harmonics as pertain to both the graph and the table, and
determine how the harmonics and interharmonics are used.
If calculate Harmonics only is enabled, then only the actual harmonics are shown.
If calculate Harmonics and interharmonics is enabled, the spectrum will include all
the (nominal) 5 Hz bins, which includes the actual interharmonics as well. On the
graph, the harmonics are shown in the channel color, while interharmonics are shown
in gray color. On the table, the harmonics are shown in boldface.
If calculate including adjacent harmonics is enabled, the interharmonics are not
explicitly shown but the harmonic values include the adjacent interharmonic values in
their calculation, as specified by IEC 61000-4-7 or IEEE 519.
The rest of the properties under harmonic options described below pertain to the way
the graph (not the table) is labelled.
The horizontal axis can be in Hz or Harmonic Number.
The vertical scale can be in Percent or Engineering units, and Scale to Fundamental
(full scale) can be chosen to be the fundamental at 100% or the largest component. The
engineering unit for voltage is volts and for current is amperes.
Press Accept to save any changes made and return to harmonic display with channels
as displayed in check boxes.
Press Cancel to return to harmonic display without changing any of the displayed
channels.
HDPQ-333
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