No Second Order Harmonics in FFT

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Nathan Kennedy
Nathan Kennedy on 5 Feb 2018
Edited: Nathan Kennedy on 6 Feb 2018
Hi,
I have a script that generates a waveform (sum of sinusoids) and puts it through an AM-AM transfer curve (the input amplitude vs output amplitude of an amplifier).
However I do not see second order harmonics on the FFT, I see third order harmonics and third order intermodulation.
Its attached and annotated. Please can someone advise.

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