FFT options scaling confusion

Usage & Issues
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#1

It looks like the FFT options calculations has the log scaling under the wrong selection according to the manual.

This image
image

produced these FFTs

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image1300×800 155 KB

It looks like the log spectrum is done under the wrong selection. of FFT options.

Let me know if I’m not understanding something.

Thanks
Ron

#2

The manual seems to be correct. When “not log” then you see only a peak, with log, you see the weak detail. To check, just process the power spectrum with a log operation.

#3

Thanks for the help…I don’t know what I was thinking…I think I need some coffee!

Ron