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Re: ARM CMSIS FFT output scaling

Reply posted 4 years ago (04/08/2017)
Got it. Here we're looking at vibration to detect mechanical wear (if assembly vibrates when moving, there's wear in the drive mechanism and/or support bearings...

Re: ARM CMSIS FFT output scaling

Reply posted 4 years ago (04/08/2017)
Apologies Tim, I don't understand.Client wants to see acceleration in XYZ, in Gs, from DC to 500Hz.Isn't the magnitude of the sine-wave the G-load (ie no power scaling)?Thanks,Best...

Re: ARM CMSIS FFT output scaling

Reply posted 4 years ago (04/07/2017)
Got it; missed that arm magnitude function didn't sum positive and negative frequencies. Since they are by definition identical, I can either add them or just adjust...

ARM CMSIS FFT output scaling

New thread started 4 years ago
Background: To analyze mechanical vibration, I'm sampling a G-meter at 1kHz for 1.024 second, doing an FFT, and calculating the magnitude per bin. The scaling factors...

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