Origin Ver.8.0 and Service Release (Select Help-->About Origin): Operating System:Windows 7
Hello all, I am trying to get a FFT of waveform (Details are attached as images and origin project file. I could able to do FFT but the peaks are showing at wrong frequency value than expected (5Hz).
From the picture you posted looks like sampling interval is roughly 1 unit (mv)and one cycle spans about 5 mv, so inverse of 5 is 0.2 and the FFT peak is around that value of 0.2. Of course Hz does not make sense here as your input x is mv and not sec, but nevertheless the value of about 0.2 for the peak is correct.
Not sure why you are expecting the peak to be at 5 (Hz) with this data...
FFT of a waveform - frequency problem
Posted - 11/20/2010 : 07:15:13 AM
