# potential measurement (fwd)

```---------- Forwarded message ----------
Date: Fri, 29 Jun 2007 13:14:08 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: potential measurement

Care must be taken here.  Cap potential is not a function of the available
cap charging potential.  It is a function of the spark gap setting which
determines the peak potential to which a cap charges before firing.

I have an accurate measuring technique (chart) in the archives regarding
measurements in 5 kV increments thru 26 kV --- potential at which Trichel
pulses begin forming and ruin accurate measurements with small 1 inch dia.
spheres.

1 pulse/sec would not provide adequate residual clearing time.  Longer time
periods are required.

Resonance Research Corp.
www.resonanceresearch.com

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, June 29, 2007 10:59 AM
Subject: Re: Jonathon's 6" Coil (fwd)

>
> ---------- Forwarded message ----------
> Date: Fri, 29 Jun 2007 08:51:08 -0700 (PDT)
> From: H.S. J. <hsheltonj@xxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Jonathon's 6" Coil (fwd)
>
> Well, Since we are on a roll with formulas, here is a more accurate
> formula for spark length given to me a while back by Bart:
>
> Spark Length (inches) = sqrt(VA) + sqrt(eJ x BPS x 1.263)
>
> Where:
> VA = input volt amps = transformer effective input power.
> eJ = effective cap energy in joules = 0.5 x C(tank) x eVp^2.
> BPS = break per second.
> eVp = effective cap voltage = x_vp*(1-pow(2.7182818,(-rsg_fr/rsg_t1))).
> x_vp = transformer peak output voltage.
> rsg_fr = rotary gap firing rate (1/bps).
> rsg_t1 = time for cap to charge to one time constant based on cap size and
> transformer current.
>
> Hope that helps^^
>
> -Shelton
>
>
> ----- Original Message ----
> From: Tesla list <tesla@xxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Sent: Friday, June 29, 2007 8:41:42 AM
> Subject: Re: Jonathon's 6" Coil (fwd)
>
>
> ---------- Forwarded message ----------
> Date: Fri, 29 Jun 2007 09:54:44 -0500
> From: D.C. Cox <resonance@xxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Jonathon's 6" Coil (fwd)
>
>
>
>
>
> To test the true peak output of a resonance transformer, it must be
> operated
> in a "single-shot" mode.  I use 1 pulse every 120 seconds which gives any
> residual ions time to clear the previous spark channel.
>
> The peak potential is then a function of the spark's distance between two
> standard 1/2 inch dia. rod gaps.  I think chip has posted this information
> in the archives for reference.
>
> In short summary:
>
> 60 cm = 332 kV     70 cm = 382 kV     80 cm = 435 kV     90 cm = 488 kV
> 100 cm = 537 kV
>
> 40 cm = 225 kV     30 cm = 172 kV     20 cm = 124 kV     15 cm = 102 kV
>
> Actually, you were around 560 kV output.  You can also check this value by
> using the equation:
>
> Vsec = Vpri x 80% x SQR(Lsec/Lpri).  This equation is very close, usually
> within a few percent.
>
> The peak potential is totally independent of the waveform.
>
> Dr. Resonance
>
>
> Resonance Research Corp.
> www.resonanceresearch.com
>
>
> ----- Original Message -----
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Friday, June 29, 2007 7:02 AM
> Subject: Re: Jonathon's 6" Coil (fwd)
>
>
>>
>> ---------- Forwarded message ----------
>> Date: Thu, 28 Jun 2007 19:58:50 -0400
>> From: Jonathon Reinhart <jonathon.reinhart@xxxxxxxxx>
>> To: Tesla list <tesla@xxxxxxxxxx>
>> Subject: Re: Jonathon's 6" Coil (fwd)
>>
>> Thanks.. I had no idea on that MV number...  What's the formula for that?
>>
>> On 6/28/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>>>
>>>
>>> ---------- Forwarded message ----------
>>> Date: Thu, 28 Jun 2007 15:43:54 -0500
>>> From: resonance <resonance@xxxxxxxxxxxx>
>>> To: Tesla list <tesla@xxxxxxxxxx>
>>> Subject: Re: Jonathon's 6" Coil (fwd)
>>>
>>>
>>>
>>> Nice to hear you have your coil running properly.
>>>
>>> BTW, 46 inch streamers represent around 240 kV in Tesla coil service.
>>>
>>> Resonance Research Corp.
>>> www.resonanceresearch.com
>>>
>>>
>>> ----- Original Message -----
>>> From: "Tesla list" <tesla@xxxxxxxxxx>
>>> To: <tesla@xxxxxxxxxx>
>>> Sent: Tuesday, June 26, 2007 10:20 PM
>>> Subject: Jonathon's 6" Coil (fwd)
>>>
>>>
>>> >
>>> > ---------- Forwarded message ----------
>>> > Date: Tue, 26 Jun 2007 20:11:05 -0400
>>> > From: Jonathon Reinhart <jonathon.reinhart@xxxxxxxxx>
>>> > To: Tesla list <tesla@xxxxxxxxxx>
>>> > Subject: Jonathon's 6" Coil
>>> >
>>> on
>>> > their projects, etc. so I thought I'd give a little feedback.
>>> >
>>> > Some of you have heard about, and some of you helped (thanks!) get my
>>> coil
>>> > started a few years back, and a little bit of help lately with my RSG.
>>> > Almost a year ago, before I went to school I built with the help of my
>>> > a pretty decent SRSG.   A week or two ago, I got it hooked up, after
>>> > doubling my tank cap from 17nf  to 34uf.
>>> >
>>> > At first, my results were quite disappointing.  I was getting plenty
>>> > of
>>> > bright sparks at the SRSG, but absolutely no output from the coil,
>>> > which
>>> I
>>> > had tuned to its previous (Segmented SSG) sweet spot.   I played and
>>> > played
>>> > with the rotation of the motor, but got nothing.  I was starting to
>>> > get
>>> > worried, concerned that I had possibly blown one of my caps due to the
>>> > SRSG
>>> > being out-of-phase.
>>> >
>>> > Getting frustrated and ready to go inside for the night, I grabbed my
>>> > primary tap and threw it on about 1/2 way in.  Keep in mind this
>>> > primary
>>> > is
>>> > only about 10-11 turns anyway.  Turned off the lights, and threw the
>>> > switch
>>> > for my coil.  Hey!  About 4 inches of breakout.  So I knew it was just
>>> > a
>>> > matter of fiddling with it.  After playing and playing with the SRSG
>>> > and
>>> > the
>>> > primary coil, I had set a new personal record for streamer length of
>>> > 46"
>>> > to
>>> > a (poorly) grounded point.  This only beat my previous record of 44 by
>>> two
>>> > inches, but hey it's progress.
>>> >
>>> > Points for improvement have been noted, however.  When adjusting the
>>> SRSG,
>>> > I
>>> > keep getting longer and longer streamers, but then the safety gaps
>>> > start
>>> > firing.  I believe I have them set too conservatively far in.  I think
>>> > I
>>> > will open them up some.  Also, my topload is 4" aluminum dryer duct
>>> around
>>> > standard-sized pie pans.  I have some 6" aluminum flexible duct work
>>> (HVAC
>>> > style) that is more ridgid, and longer, so I can stretch it out around
>>> > a
>>> > larger  pizza-sized pie pan.
>>> >
>>> > Glad to be playing with ~0.75MV again :-)
>>> >
>>> > Jonathon
>>> >
>>> >
>>> >
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>
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