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3-13
CH 3/ View Real Time Data
Harmonic Graph
Harmonic graph
display
The harmonic graph can be displayed by pressing Harmonics on the Home screen. The
screen defaults to a graphical spectrum display, although users have the option to
choose between the graph and list form. The screen will show a spectral graph featuring
the amplitude of the harmonics relative to the fundamental frequency.
Use the properties under the Options button to select the vertical and horizontal
measurement scale. The percent magnitude of the first 60 harmonics are graphed
relative to the fundamental.
*The odd contribution is the square root of the sum of the squares of the relative
amplitudes of harmonics 3, 5, and 7 through N-1, where N is a function of sampling
frequency. The even contribution is similar for harmonics 2, 4, and 6 through N. Total
value is the square root of the sum of the squares of the odd and even distortions.
Magnify harmonic
graph (p. 3-14)
Show harmonics
text (p. 3-17)
Switch channel
display
Switch to
V, I, or W
Total harmonic distortion
(THD) on Odd contribution
and Even contribution
based on 127 harmonics*
MARK221
Set harmonic options
(p. 3-15)
Display is
updated
approximately
once per
second
58


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