I think I'd use a variable speed reversible drill for this. You'll need
some sort of pointed rubber tipped bit - but they can be found (we use
them all the time in industry to check motor speeds - they're also a
standard attachment for air guns (but threaded). You can put it on the
armerature (or center of the fan - whatever you want to call it), and spin
the right direction and control the speed.
Phil Bates
> If you can spin the dynamo then by linking the F and D terminals and
> connecting a voltmeter between that link and the body of the dynamo you
> should be able to measure an output voltage. However it should not be
> spun
> so much that it generates more than 20v or you can damage it, so you will
> need some way of controlling its rotational speed whilst watching the
> voltmeter. It will probably not work being spun in the wrong direction.
> Normally it should get to 20v when fitted to an engine doing 1000 rpm.
> You
> won't know that with an air jet, so at best it will be a go-no go test
> which
> may still deliver low output when fitted to an engine. If you only see
> about 1v the field winding may be faulty. If you only see about 4 or 5v
> the
> armature winding may be faulty.
>
> PaulH.
>
> ----- Original Message -----
>
>> How do I test the output of the dynamo? I have an extra dynamo which is
>> sitting on the workbench. Compressed air directed on the vanes of the
>> pulley allow me to "run it up". Where should I connect a voltmeter to
>> check the output.
>
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