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From: Mario Trams
Subject: Re: Using Frequency Counter to measure short pulses
Date: Tue, 05 Nov 2002 16:45:47 -0500
Organization: TU Chemnitz
NNTP-Posting-Date: 5 Nov 2002 15:37:01 GMT
Nick Funk wrote:
> Is it possible to utilize a frequency counter to measure short pulses.
> I would guess that if it is possible one must design a oscillator to be
> used as a time base and then a trigger circuit to start and stop the
> pulse train for measurement.
See other posts.
> With proper selection of oscillator frequency one can measure RPMs or
> distance measurements with proper display in revolutions per minute or
> feet (meters).
For RPM measurement I would suggest a simple counter that
is triggered each time an event occurs - usually once per rotation, but
can also be > 1 for higher accuracy.
This counter has to be read and reset regularly (say each 1/10 of a
second, for instance). From the read value you can calculate RPM
depending on the fixed parameters (events per rotation, checking
This method should work fine for "usual" RPMs in "daily"
applications. For very precise measurement of very low RPM
values other methods might be more applicable (i.e. measuring
the duration when a light barrier is blocked or not blocked).
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