Measurements using field probe

From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Friday, July 03, 1998 11:33 AM
To:  Tesla List
Subject:  Re: Measurements using field probe

to: John

Wouldn't the peak potential be the same with either TC or VDGRF?  I used an
electrostatic generating field mill voltmeter and measured the peaks with
similar results to that predicted by the SQR Ls/Lp equation.  Comments.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: Measurements using field probe
> Date: Thursday, July 02, 1998 9:49 PM
> ----------
> From:  John H. Couture [SMTP:couturejh-at-worldnet.att-dot-net]
> Sent:  Thursday, July 02, 1998 2:01 PM
> To:  Tesla List
> Subject:  Re: Measurements using field probe
>   Terry, All -
>   Your experiments on measuring the voltage on the TC secondary terminal
> interesting and instructive. I thought you would be interested in tests I
> did several years ago to check the voltage on the Morris and Lee 250 KV
> De Graaff generator. I got 241 KV which was close enough.  This is
> but not exactly what you are doing.
>   The VDG generator charges a terminal with DC not AC like a Tesla coil.
> charged object in space can be detected in two ways, either by the
> it produces or by the force it produces. These tests require two
> methods and two different equations. The potential varies directly as the
> distance and the force varies as the square of the distance.
>   To detect the potential of the charged VDG terminal I used a 2 inch dia
> brass door knob connected to an electrostatic voltmeter. The setup and
> calculations are simple but electrostatic units are used which are not
> familiar to most coilers. The equation is:
>       Stat Volts = Stat Coulombs/cm
>   This equation has the advantage that it combines the three important
> parameters, that is, volts, coulombs, and distance. This equation tells
> that the charged object (statcoulombs) produces a potential (statvolts)
at a
> certain distance (CM). The electrostatic  potential varies directly as
> distance and can easily be found for any distance from the object with
> electrostatic voltmeter. Note that this test is not the same as the radio
> field strength meter test.
>   The details on using electrostatic units can be found in electrical
> engineering handbooks and physics texts.
>   John Couture