iBike newton's power reading error

[redhybrid]

Hi guys,

I just got my Newton 5+ , I have a problem regarding the power reading on my unit . Whenever I encounter small vibrations on road while riding, the power reading on my unit drops to zero.
I have done 4 Cal ride so far and check calibration again and again but still the problem is there.

I also change the filter from dynamic to other sampling rate (0,2 sec), turn off and on Powersoke, front mount is rock solid and the cadence sensor is ok. To ensure this problem is cause by vibration I do a short ride on stone paving road.

the data

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Picture about shows the zero reading of power for entire ride on the stone paving road, the speed and cadence aren't. Is this indicate my unit has a hardware malfunctioning?

please help

stone paving road

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front mount on my bike (solid)

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[Velocomp]

The problem is your mount extension.

The mount extension you are using is not something that we make or sell. I haven't seen this one before, but my guess is that it is made out of plastic. Furthermore, my guess is that, if you push on your Newton a bit, you'll find that the mount extension flexes a little bit.

Your Newton is cantilevered out on the end of the extension. What is happening is that the flexible mount extension is vibrating on the cobbles, with the net effect that your Newton points down a little bit. This causes slope to become negative and causes watts to go to zero.

Though these kinds of extensions work just fine on "normal" roads, they can get into trouble on rough roads.

Now you know why we use machined aluminum on our front mounts, and even have a two-arm front mount--they provide the highest stiffness possible!

[redhybrid]

Thank you, yes you are right.

I did some experiment in my lab this afternoon and found that the deformation of the fiber reinforced plastics is quite large. Similar problem happened before in our wind tunnel experiment due to the vibration on sensors which cause error data. So I did some modification for the stand...

self made T6061 Al stand

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old school!

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then I went to ride again on stone road!

Accurate data!

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Yes, problem solved!!!

Thank you very much~

[Velocomp]

I like your solution!