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Re: O'scope hook-ups (hv-probes)
From: richard hull[SMTP:rhull-at-richmond.infi-dot-net]
Sent: Monday, August 25, 1997 8:13 PM
To: Tesla List
Subject: Re: O'scope hook-ups (hv-probes)
At 08:36 AM 8/22/97 -0500, you wrote:
>
>From: Jim Fosse[SMTP:jim.fosse-at-bjt-dot-net]
>Reply To: jim.fosse-at-bjt-dot-net
>Sent: Thursday, August 21, 1997 7:58 PM
>To: Tesla List
>Subject: Re: O'scope hook-ups (hv-probes)
>
>>From: richard hull[SMTP:rhull-at-richmond.infi-dot-net]
>>Sent: Tuesday, August 19, 1997 8:14 PM
>>To: Tesla List
>>Subject: Re: O'scope hook-ups (hv-probes)
>>
>[snip]
>> In my
>>>case I have no problem making this distance 10X or better than my
>>>spark distance. You on the other hand, would need to place the pickup
>>>plate in the next town;)
>>>
>
>>>Jim,
>>
>>I got a big laugh outta' that last line! I have used the field mill with my
>>electrometers, both home made and Keithley. It really directionalizes the
>>natural electrostatic sensitivity of a good electrometer. Needless to say,
>>all are useless with the large maggey #11E. That is why I am working with
>>much smaller systems now on the electrostatic effects. Thanks for reposting
>>Freds "field mill" post. I am sure those on the wise will take note and use
>>it for the purpose it was intended.
>>
>Richard,
> I had a thought/question last night. Is the ion cloud around
>the TC's toroid distributed around the toroid? Or is it in the
>streamers or arc? If it's not around the toroid, why not place a very
>small field mill under the primary and look up to the (unobstructed
>view) of the bottom of the toroid? The shield would of course have to
>be an open spiral to not act as a shorted turn.
>
> Do you have any thoughts on the ion cloud distribution from a
>TC?
>
> Regards,
>
> jim
>
>p.s. I live about 40 miles (as the crow flies) away from GL, I fully
>intend to go up on the roof of my house with a 4' fluorescent lamp in
>hand and measure his new 3 phase 100KW++ TC that way;)
>
>
>
>Jim,
No, I have little factual data on where the ions are concentrated. I would
imagine along the arc streamlines or at any corona point. The problem with
the field mill (E.S. probe) located under the toroid is the inability to
shield the input to so sensitive an instrument from the violent EM fields
near the primary.
Richard Hull, TCBOR