Gossen Metrawatt M817S Mains-analysis device, Mains analyser M817S Scheda Tecnica

3-13

CH 3/ View Real Time Data

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