My Ducati requires an expensive laser device too tension its' cam belt by measuring the belts resonant frequency when the belt is plucked. The spec is 110Hz +/-5Hz.
So why not break out my laptop running TrueaudioRTA (spectrum analyzer) and a microphone? Didn't know if the S/N would be good enough, or if the peak would be narrow enough to provide the resolution required.
It worked fantastic, nice big amplitude with a narrow bandwidth, and it was repeatable.
I'm still amazed when theory and practice agree.
My Ducati requires an expensive laser device too tension its' cam belt by measuring the belts resonant frequency when the belt is plucked. The spec is 110Hz +/-5Hz.
So why not break out my laptop running TrueaudioRTA (spectrum analyzer) and a microphone? Didn't know if the S/N would be good enough, or if the peak would be narrow enough to provide the resolution required.
It worked fantastic, nice big amplitude with a narrow bandwidth, and it was repeatable.
I'm still amazed when theory and practice agree.