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Harmonics
Select Logger > Display Real-Time Values > Harmonics to see the actual harmonic content in the
current, voltage, and power waveforms. A typical display is shown here:
The selections on the lower left side of the window
select the displayed Channel. Only one channel may
be viewed at a time. The voltage and current
harmonics are presented graphically in the upper
part of the window. The ordinate (y-axis) is scaled in
percent of the fundamental. The abscissa (x-axis) is
the harmonic. Both even and odd harmonics plus
DC are shown.
The actual value of the voltage and current for each harmonic may be found in the Harmonic Values
section. By clicking on the arrow buttons, higher and lower order harmonics may be selected.
Though only the first 31 harmonics are displayed in the graph, the Harmonic Values function can be
used to view the values up to the 63 harmonics. The Waveform Values section provides summary
statistics for the overall voltage and current waveforms. This includes the RMS value, THD, Peak
values, Crest Factor, Line Frequency, and K-Factor.
ID
OU
NOW
? The individual harmonic
values and THD can be shown as a
percentage of the fundamental (IEEE
Standard 1035-1989) or as a percentage
of the total RMS value (CSA and IEC
w ww. . com
information@itm.com1.800.561.8187
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