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Re: Sparks to ground


I can't even make a spark without a billion
safety people present!  Something to do with
airplane wings filled with jp5, and other things!

You on the other hand.....
You are thoughtful though knowing full
well that a considerable expertise is required
for this kind of measurement.  As a first order
you could try an integrator with a homemaid
Rogowski coil hooked up to a HV diode
and polystyrene or teflon capacitor to get
the peaks.  It can be calibrated in situ
with a pulse generator.

Another way is to use your $900 current
probe hooked to the scope through
"N" attenuators.  Take out attenuators
one at a time until a reading is obtained
above the noise floor.  I can understand
your temerity at not wanting to risk your
new probe or scope for that matter!

Then again you could isolate the homemaid
Rogowski probe via back to back LEDs.
A long opaque tube could convey the
light to a solar cell (slow), photodiode,
or phototransistor hooked up to a tube
scope (aka indestructable toaster).
Wrap the scopes' cord around a toroid
to cut the line noise.

By the way I mean't the little coil.  Not the
Maggy!!!!

Barry

 ----------
|From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|Subject: Re: Sparks to ground
|Date: Friday, November 22, 1996 12:12AM
|
|<<File Attachment: 00000000.TXT>>
|> Subject: RE: Sparks to ground
|
|From hullr-at-whitlock-dot-comThu Nov 21 16:19:01 1996
|Date: Tue, 14 Mar 2000 04:33:57 -0800
|From: Richard Hull <hullr-at-whitlock-dot-com>
|To: tesla-at-pupman-dot-com
|Subject: Re: Sparks to ground
|
|Tesla List wrote:
|>
|> >From Benson_Barry%PAX5-at-mr.nawcad.navy.milThu Nov 21 09:44:41 1996
|> Date: Thu, 21 Nov 1996 06:39:00 -0400 (EDT)
|> From: Benson_Barry%PAX5-at-mr.nawcad.navy.mil
|> To: tesla-at-poodle.pupman-dot-com
|> Subject: RE: Sparks to ground
|>
|> Can you get a measurement of the spark current via
|> current probe around a grounded wire?  Need to insulate
|> the probe from the ground wire with a plastic tube for
|> about a foot on either side of it.  The scope will need to
|> be shielded (galvanized trash can + radioshack inverter
|> + car battery).  From the current the spark channel
|> impedance may be roughrd out thus giving a rough
|> idea of just how much the spark does load the resonator!
|> Barry
|>
|>
|
|Barry,
|
|This will definitely work!  But with your stuff not mine!
|
|Richard Hull,TCBOR
|