Operation and Application 
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Thd profile: THD file name 
Thd formula: Distortion factor calculation formula. 
%r:  displaying  harmonics  in  the  form  of  percentage  to  the  overall  voltage 
amplitude of all harmonics.     
%f: displaying harmonics in the form of percentage to the fundamental voltage. 
Delete: select a row and click Delete. 
Open: import Thd wave data. 
Save: Save the THD wave. 
Back: return back upper menu.   
THD=: Total distortion rate calculated based on the user Thd configuration. 
6.14.2 Selfdefined 
“+” create a new wave.   
“-” delete the wave file. 
“ ” edit the wave file.