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On the left you see a picture of the
open Powermeter. The Powermeter is made of 7075 aluminium. On the 4 arms
from the center to the outer ring the straingauge stripes are applied.
The signals from these stripes, change their resistance in dependance of
the flection of the 4 arms, are directly voltage-to-frequency- converted
by the electronics in the Powermeter. This frequency, proportional to the
torque, is then transmitted inductively to a receiver on the bike frame.
By this type of application no energy is lost by measuring the torque
power = torque x cadence The Powermeter gets its energy from a lithium battery with a lifetime of about 2000 hours of use. |
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