3-19
CH 3/ View Real Time Data
Harmonic/
Interharmonic
data plots
(continued)
Harmonic Computation for 60 Hz
Properties under Graph Units pertain to the way the graph (not the list) is labelled. The
vertical scale can be in Percent or Engineering units, and Scale to Fund (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. The horizontal axis can
be in Hz or Harmonic Number.
0.0%
0.5%
1.0%
1.5%
2.0%
2.5%
3.0%
… 160 165 170 175 180 185 190 195 200 205 210 215 220 225 230 235 240 245 250 …
3rd harmonic
+
2 adjacent
interharmonics
4th harmonic
+
2 adjacent
interharmonics
measurement scale for
frequency (x axis) and
amplitude (y axis) of
harmonics
full scale graph relative to
fundamental frequency
harmonic data display
MARK236
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