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3-16

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.

Zoom in to desired

range of frequencies

(p. 3-17)

Show harmonics text

(p. 3-20)

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. 3-18)

Display is

updated

approximately

once per

second

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 289 290

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Dranetz Xplorer Guida Utente Pagina 58