How do I calculate THD in proteus?

Question

I know how to plot the Fourier transform, but is there a more precise way to measure the total harmonic distortion?

I have this graph:

As you see, there's only one distinguishable component at 1 kHz which is what I want. I need a THD less than 5% . Is the ThD zero here?

Well it certainly is, based on your plot, but your plot is rather useless. Try removing the mean of your input signal before computing the FFT. Either way, the calculation from your fixed data set is going to largely depend on the number of samples and on your windowing function. — Blair Fonville, Commented Jul 10, 2018 at 21:42
@TonyEErocketscientist The thing is I can only see one peak at 1 kHz. — Mah, Commented Jul 11, 2018 at 1:49
Yes I see better now. Can't you normalize it on a log scale? — D.A.S., Commented Jul 11, 2018 at 2:03

Mah · Accepted Answer · 2018-07-24 16:09:29Z

-1

I ended up transferring the data to a DAT file. You can access that in the graph tab for that.

answered Jul 24, 2018 at 16:09

Mah

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