Extracting real time data from a waveform graph

[Stu_Turner]

I have a VI which plots a real time FFT of the output from an AE sensor, which is displayed on a waveform graph. There are two peaks of interest and I would like to be able to extract in real time the magnitudes of the two peaks so that I can work out and display their live relative intensities. Anyone have an idea how I can do this?

[Rob_Ward]

Dear Stu,

Is it possible for you to upload your code or screenshots of your front panel/ block diagram.  There are a couple of functions I could think of using such as Array Max & Min PtByPt.vi and then use the index to calculate the horizontal spacing and value to calculate relative intesities.  You could also use Sort 1D Array to put your values in ascending order to return your two peaks.

Kind Regards,