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Re: Voltagee measurement



Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Kamil,
> 
> Using the chart at:
> 
> http://hot-streamer-dot-com/TeslaCoils/Misc/SGapVolt.jpg
> 
> Probably around 17.5kV.
> 
> Cheers,
> 
>         Terry
> 
> At 02:26 AM 9/27/2001 +0200, you wrote:
> >Hi !
> >
> >I have a trouble with a transformer. I don't know it's parameters, so I want
> >to measure voltage
> >of the transformer (i think 5 to 20 kV). How can I do this?
> >I found that spark apears between the electrodes connected to the
> >transformer when the gap is about 15mm (between sharp nails) and about 6mm
> >gap is required when electrotes are two spheres (no sharp edges).
> >I know that breakdown in air is about 30V per 0.025mm, but which distance
> >schould I use for accountings (6mm or 15mm)?
> >I also noticed that when nails aore little wider than 15mm on the top of one
> >of them appears corona. (sparks striking to the air in the direction of the
> >other nail). There is no corona when I use spheres separated with more than
> >6mm of air.
> >Could you tell me something about the output voltage of my transformer
> >having this data?
> >Thanks for all answers.
> >
> >Kamil Kompa
> >

	If you don't have a HV voltmeter, a simple way to measure the voltage
is to feed the secondary (HV) winding from the power line and measure
the voltage on the primary.  From that you can calculate the turns ratio
and thus the output voltage when powered in the normal manner.

Ed