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Re: Terrified Parents
Original poster: "Crow Leader" <tesla-at-lists.symmetric-dot-net>
Urban legen or not, it shouldn't be assumed a divider probe cannot fail or
short, giving you more than a few uA between the HV side and the where a
meter connects. I have in the past used a TV flyback probe on my quarter
crusher. It seemed like a bad idea at the time, and probably is. Next time I
fire it up, I'll take readings in a more hands off way. Burned/charred
plastic insulators (HV probes) probably conduct well, like burned PVC pipes
in tesla coil secondaries.
KEN
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, November 29, 2003 7:33 PM
Subject: Re: Terrified Parents
> Original poster: dhmccauley-at-spacecatlighting-dot-com
>
> Definitely an urban legend. HV probes always have dividers built in them.
> Thats the whole purpose of a HV probe. If it didn't have the divider, it
> would basically be
> just a metal rod with an insulated handle.
>
> However, i do have a story that is true. A technician at my company was
> working with a radar transmitter in the high voltage cabinet, and was
taking
> oscilloscope measurements from a
> modulating high voltage deck. The deck itself is low voltage (28VDC with
> +/-1000VDC for the grid modulating system), but the entire deck is floated
> at the cathode voltage of the TWTs
> which is about 45-60kV depending on TWT. Anyways, the oscilloscope was
> being floated on top of the deck to measure something in the deck, and the
> technician went to change a setting
> on the scope and . . . well . . . you can imagine what happened next.
>
> Dan
>
> > Sounds like an urban legend to me. Aren't most
> > handheld Simpson meters "low" voltage (<13 kV)? Every
> > HV probe I've encountered was a voltage divider.
> >
> > Adam
> >
> > --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > > Original poster: "Stephen Mathieson"
> > > <s.mathieson-at-charter-dot-net>
> > >
> > > Terror is your friend. I have been coiling for a
> > > number of years thought and
> > > dealing with high voltages much longer. Nothing
> > > compares to seeing a Master
> > > Electrician attempt to measure 13.2KV with a HV
> > > probe, gauntlets and the
> > > works, but his assistant was holding a Simpson meter
> > > and leaning against a
> > > light pole. The arcs came out through the screws in
> > > the back of the meter
> > > and the current blew a 12" diameter hole in the back
> > > of the assistant
> > > killing him instantly.
> > >
> > > As I said, terror is your friend. You can overcome
> > > it but it will always
> > > make you think twice about what you do and what you
> > > touch. Terror can help
> > > keep you safe!
> > >
> > > Stephen A. Mathieson
> > >
> > > -----Original Message-----
> > > From: Tesla list [mailto:tesla-at-pupman-dot-com]
> > > Sent: Friday, November 28, 2003 9:35 PM
> > > To: tesla-at-pupman-dot-com
> > > Subject: Re: Terrified Parents
> > >
> > > Original poster: Tesla729-at-cs-dot-com
> > >
> > > In a message dated 11/28/03 7:02:46 AM Pacific
> > > Standard Time,
> > > tesla-at-pupman-dot-com writes:
> > > >All figures available at
> > >
> > >
> >
>
><http://www.cpsc.gov/library/data.html>http://www.cpsc.gov/library/data.htm
> > > l
> > > >
> > > >So... statistically, Tesla coils have a better
> > > safety record than consumer
> > > >electronics, trampolines, and candles.
> > > >
> > > ><In fact, every job, hobby, sport, activity, or
> > > just
> > > >about anything worth doing carries a certain
> > > amount of
> > > >risk. Tesla coiling occupies a pretty low spot on
> > > the
> > > >risk scale, way below skateboarding, woodworking,
> > > >cycling, swimming, football, or even driving a
> > > car.>
> > > >
> > > >Absolutely!!
> > >
> > >
> > > Hi all,
> > >
> > > Yes that's very true but you also have to realize
> > > that there is
> > > relatively very few people that play with Tesla
> > > coils, probably
> > > less than .01% of the general population. .01% of
> > > nearly 300
> > > million US citizens is still like 30,000 and I
> > > seriously doubt that
> > > there are 30,000 active coilers in the USA. I'm sure
> > > that there
> > > is a MUCH higher % participation in the other "more
> > > hazardous"
> > > activities (mowing grass, burning candles, driving a
> > > car, ect.) than
> > > there is in coiling. Since so realtively few people
> > > practice coiling, there
> > > is consequently few incidents. I'm sure that most
> > > coilers playing it
> > > safe does go a long toward keeping the accidents
> > > low, too, though.
> > >
> > > David Rieben
> > >
> > >
> >
> >
> > _
>
>
>