Fourier Analysis Tool

[itkiwi]

I have a column of data which describes one cycle of a waveform.
How can I use this tool to give me the harmonic analysis of the waveform
(magnitude and phase) ?
Thanks,

 

[Dana DeLouis]

I use Fourier Analysis often. I wasn't sure what the question was.
It's a Radix-2 algorithm, so you need 2^n points in case that is what's
giving you an error.
Or, is your question on how to convert an imaginary number into something
like Sin(f*2*Pi/n + w) form? (or Cos(..) )
Sometimes, you may just want to use IMABS() on each output data to get a
simulated "Spectrim analysis" of your data.

Dana DeLouis

 

[itkiwi]

Thanks.
I have 128 sample values, taken over 20 milliseconds, ie., a sample every
156.25 uSec. There are actually two waveforms; my reference sinewave, and
another distorted non-sinusoidal, periodic waveform. I can chart these
waveforms in Excel.
I would like to make a harmonic analysis of the non-sunusoidal waveform,
breaking it down into magnitude and phase of the fundamental and harmonics,
then compare this result with my reference sinewave.