Is there any such thing? I am just interested in it as an academic exercise because I realised the market timing on motors has small deviations due to the way various manufacturing tolerances add up. These include but I guess are not limited to the inherent sensor pick-up point, sensor PCB placing, graduation on the motor can vernier, etc. An instrument is needed then to measure effective timing on the motor as it comes out of the box rather than rely on manufacturer indicated timing. All info appreciated.
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