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Re: Frequecy counter, measuring 2ndary output
Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>
In a message dated 5/21/01 11:17:06 PM Eastern Daylight Time,
> Trying to measure the BPS is a more difficult task. I've also asked but
> found no way to directly measure this with a counter. The best way is
> to use a single-sweep storage or digital scope. Lacking that, Richie
> Burnette has used an audio tape recorder to record the gap sound, then
> played that into his PC's audio recorder. This allows the ampitude
> peaks to be seen and counted over some interval of time, thereby
> indicating the BPS. Haven't tried this myself but sounds simple enough.
> Regards, Gary Lau
> MA, USA
I would think it would be easy to make a hand-held device, using
a photocell and a self-designed counter circuit to count the light pulses
from the spark gap to measure the bps. A low pass filter would
be used so the RF or notches are ignored. THe device would
count for a given amount of time such as 1 second, and would
read out how many firings occured during that time on an LED
7 segment display. I've always been meaning to build one, but
never got around to it. There would be a sensitivity and reset
button, etc. All built into a small metal box with battery power.
I was also thinking of making a similar device to measure quench
times. The firing of the gap would start the clock, etc.