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On 2017/Sep/18, at 17:46, John Denker via Phys-l <phys-l@mail.phys-l.org> wrote:
For the period data, the residuals are here:
https://www.av8n.com/physics/img48/fidget-spinner-period-residuals.png <https://www.av8n.com/physics/img48/fidget-spinner-period-residuals.png>
There is an outside chance that the glitches are real, perhaps
due to grit in the bearings ... but I would be willing to bet
they are bogus, due to problems in the analysis, perhaps in
the FFT routine. This is why you want to record the raw
signal. Don't be in a hurry to do the FFT.