ooh ooh ooh
you learn this in high school physics
you need a stobe light with a controllable frequency
you point it at it and adjust it till the blades stop
at that point your frequency is a multiple of the fans
frequency.
Youll find as you lower the frequency the blades will
move again and then slow and stop.
You will eventually match the number of rotations and
then youll get the same affect as you get to 1/2
frequency or 1/4 frequency
stop the fan and mark a blade. start it again, then
get the mark to stand still and repeat the process.
if your at 1/2 youll find that the dot is in two places
(or more as you go to 1/4...), increase frequency till
it stops in place. Presto! your frequency matches the
number of rotations per second.
You can then work out all sorts of neat stuff in
combo with the blade length (eg radius)
works for all fans and isnt os dependant. it is also
free to use but comes with no warranty and you can
distribute it.
Dean
Michael Lake wrote:
>
> Alex Salmon wrote:
> > i have one of those 3 wire fans on my cpu. My question is how do i measure
> > the rpm of my fan from it.
>
> rpm --query --speed -p fan
>
> Mike :-)
> --
> --------------------------------------------------------------------
> Michael Lake
> Active caver, Linux enthusiast and interested in anything technical.
> Safety Convenor, Australian Speleological Federation
> Owner, Speleonics (Australia)
> --------------------------------------------------------------------
>
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