This video shows how to use the FFT function on an oscilloscope to measure the relative amplitude of the harmonic distortion components of a signal, and then take those results and compute the THD, or Total Harmonic Distortion. Actual measurements are shown, and results are validated by a THD calculator in the scope as well as a THD measuring multimeter.
Videos mentioned in this video are:
Audio Compressor project: https://youtu.be/1h0FZJYXQ_w
Demo of above: https://youtu.be/pUii_pDQxg8
Basics of using FFT: https://youtu.be/oRf-IpG6XAw
Basics of dB: https://youtu.be/1mulRI-EZ80
Notes from this video:
http://www.qsl.net/w2aew/youtube/THD_with_FFT.pdf
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