Jump to content

Power Meter Drift


Recommended Posts

So I did a 20 min ergo test today. My offset was 128 at the start and then I did it again at the end and it was 140. It was very very humid and indoors.

Does a 12 point drift mean much ? It was my best ever test so I want to make sure it's not massively out !!!

It's a quarq.

Link to post
Share on other sites

So I did a 20 min ergo test today. My offset was 128 at the start and then I did it again at the end and it was 140. It was very very humid and indoors.

Does a 12 point drift mean much ? It was my best ever test so I want to make sure it's not massively out !!!

It's a quarq.

That's 10% of drift but I'm not sure what that means in the numbers

I'm pretty sure it wouldn't be putting your FTP out by 100 though

 

Maybe if you did it on the road then it wouldn't be drifting as much lol

Cheers

Ivp

Link to post
Share on other sites

So I did a 20 min ergo test today. My offset was 128 at the start and then I did it again at the end and it was 140. It was very very humid and indoors.

Does a 12 point drift mean much ? It was my best ever test so I want to make sure it's not massively out !!!

It's a quarq.

 

Quarq reports torque values in units of 1/32 Nm. So your unit drifted 12/32Nm during the session.

 

How much power error that equates to depends on the crank's rotational velocity, as well as when the drift occured.

 

wattage = rotational velocity in radians per second x torque in Nm

 

e.g 90 rpm ~= 9.42 radians per second

 

9.42 x 12/32 = 3.5W

 

at 110rpm = 4.3W

Edited by Alex Simmons
Link to post
Share on other sites
×
×
  • Create New...