Re: Electronic damage

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Justin,

On 21 Jun 2002, at 17:18, Tesla list wrote:

> Original poster: "Justin Hays by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<pyrotrons2000-at-yahoo-dot-com>
> 
> Hi All,
> 
> > but has any one ever run a coil on stage in a theatre with all the
> > lights and sound gear up and running?
> 
> kVA Effects sure has!
> 
> I pulled an arc off my SSTC...with my new Canon Powershot S100
> digital camera!
> 
> Ask me how I knew it wouldn't fry? It's all steel construction, a
> very good faraday cage! Really really cool as I can get nice close-up
> arc pics without having my fingers crossed...
> 
> However, my computer didn't fare so well. I had a 3.5" coil running
> 270VA (9kV 30mA neon), distance from it to computer was 15 feet.
> Dedicated RF ground separate from house ground, and the coil has a
> line filter installed. We're talking radiated RFI here, it locked my
> computer up repeatedly. Didn't hurt it, just freaked it out.
> 
> The pulsed fields around TC's are unpredicable as far as EMI goes. I
> would shield the heck out of everything you plan to operate the coil
> near.
> 
> BTW, it's been my experience that small coils generate "worse" EMI
> than big coils. It's got to be the higher frequency.

At least part, if not all of the problem will be that almost every 
conducting object becomes a much more effective aerial as the 
frequencies go up. 

Regards,
Malcolm