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5 % artefacts in HR measurement

Hello,

2 weeks before I find out in the Software Runalyze that I get 5% artefacts in the HR measurement, like in the attachment. I also attached a fully correct screenshot with 0,01% artefacts with the same HW constellation. When I run with a belt witch is connected via Bluetooth or ANT+. I get the problem with two HR sensors where one of it has a brand new belt. With the HR sensors is everything ok.

I measure the HR and HRV over the HR belt and send it to my FR 245. Over the SW Runalyze it is possible to show the dfa alpha1. If I get more than 2% artefacts( wrong HR, see attachment) the measurement is not valid. The wrong HR is always in the same range and only the SW was changed from my FR in my setup.

Please give me a feedback, thank you for help.

Regards