In article <usekh114fbrkbecrjq0fm3v766hoim5gfc@4ax.com>,
xmrichmond@xaustin.xrr.xcom says...
> On Sat, 3 Sep 2005 17:01:35 -0700, Randy Hunt <rhunt960@tco.net>
> wrote:
>
> >The 'Old' Dwell meters were usually based on continuity testers. I
> >suppose you could measure continuity with it. I have seen articles in
> >the electronic trade magazines about using Volt-Ohm (V.O.M.)meters for
> >measuring point dwell. This was back in the late sixties and early
> >seventies. I know I'm showing my age here.
>
> Young whippersnapper!
>
> My dwell meter scale read in degrees. I never took it apart but my
> guess was that it was some sort of RC circuit (or maybe IRC) with a
> voltmeter reading the potential across the capacitor. The longer the
> dwell, the more charge the capacitor would accumulate, and the higher
> the voltage, which would then read as a larger dwell angle.
>
>
> Elliot Richmond
> Freelance Science Writer and Editor
>
Some of them would simply let the longer the dwell be indicated by the
lower resistance read. Letting the mechanical inertia of the meter
integrating the pulses into a smooth reading.

Randy