I have a very similar issue. Your help would be greatly appreciated.
I am trying to get the FFT of a 1D array which is basically an excited sine wave (or what many know as a 'chirp').
However, the data points seem to be too large in magnitude. Is there a scaling factor or anything of that sort that I may be missing?
I have made sure that the inputs to the FFT block are what I am expecting and that the FFT is set to process a 1D array.
Since this partial work-product, I am unable to supply the VI but have added extensive pics detailing the issue.
'Alpha 4' shows the chirp mid way and shows the waves are clean and without distortion at a high frequency.
'Beta 1' shows the same thing but at a lower frequency.
'AlphaOut' is the signal that I want and I have probed/zoomed to verify this.
The top 4 graphs are all the same (i.e. a sine wave being excited from 0-1500Hz in 5 secs at a rate of 300Hz/second). All graphs have been zoomed in at different points to show clarity.
The 'Real Part' graph is where I am stuck.
Please let me know if any other info is needed.
Any ideas or help would be greatly appreciated.