Message text written by "Peter C."
>What typically happens when the needle bounces is the clearance between
the
magnetic disc and the aluminum cup occasionally gets to zero (they touch).
The magnetic disc is connected to, and spins with, the cable. The aluminum
cup (non-ferrous) is connected to the needle. The very slight
magnetic attraction of the aluminum cup is what is indicated by the
needle. The cup is kind of being dragged by the spinning magnet. When the
two touch, the needle bounces. Why would they touch? Bad bearings
supporting one, or the other, or both. Or, if the cable is too long it can
push the magnetic disc into the aluminum cup.
or so it has been explained to me.
<
Thanks for the description. I always thought as much but have never had it
explained to me before.
Dave
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