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4hv.org :: Forums :: Tesla Coils
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Spark Gap Frequncy

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Seeker
Sat Dec 24 2011, 03:19PM Print
Seeker Registered Member #4105 Joined: Sun Sept 25 2011, 02:27PM
Location:
Posts: 7
How would you measure the firing rate (frequency) of a static spark gap?
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Hazmatt_(The Underdog)
Sat Dec 24 2011, 10:13PM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
1. Hall effect sensor near one of the output rails, sense the current/low pass filter into a squaring circuit into a freq. counter

2. Microphone/LPF again/squaring cicruit/freq. counter

3. Strobotach. $$$ I have one of these but not sure it's working properly, it's also dim. Make sure you get one with a Xenon flashlamp.

4. All of the above do not necessarily synchronize with the line, you need to ask yourself if you need firing rate AND to know if you're line synchronized. If the answer is yes to both, then you have to come up with a sync. circuit too.
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Herr Zapp
Sun Dec 25 2011, 09:13AM
Herr Zapp Registered Member #480 Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Seeker -

I can't find links to any of the information at this time, but this question has been previously studied in detail, using both acoustic and optical means to determine the firing rate of TC static spark gaps. As I recall, the firing was found to be rather chaotic, and never remotely achieved the steady break-rate seen in synchronous rotary spark gaps. That's why a typical static spark gap sounds so "ragged", without any discernable tone.

Herr Zapp
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Finn Hammer
Sun Dec 25 2011, 10:22AM
Finn Hammer Registered Member #205 Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Link2
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