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The trouble is that power meters tend not to recognise negative power figures and report these internally and externally as zero. So when you're slowing down, the power meter thinks that there's no power, and starts an autozero even though in fact there's load being applied, albeit reverse load. This skews the zero, and gives you inflated power figures.
Brommers
Howard
Please could you explain why this might be an issue for use in a velodrome or in a fixed tt situation with P2M? Shouldn't the p2m auto zero only when there is 2secs of no power which is unlikely to happen on a fixed? thanks