Measurements using field probe

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Measurements using field probe
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Tue, 30 Jun 1998 22:59:43 -0500
• Approved: tesla-at-stic-dot-net

----------
From:  Bert Hickman [SMTP:bert.hickman-at-aquila-dot-com]
Sent:  Tuesday, June 30, 1998 7:12 AM
To:  Tesla List
Subject:  Re: Measurements using field probe

Tesla List wrote:
> 
> ----------
> From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
> Sent:  Monday, June 29, 1998 8:08 AM
> To:  Tesla List
> Subject:  Re: Measurements using field probe
> 
> to: Bert
> 
> It would not be reasonable to assume the 144 Ohm resistance for the 420 BPS
> of operation.  This value would only be true for the first few firings of
> the cap as the "hot" resistance of the bulb is considerably less than its
> initial "cold" measured DC resistance.  After a few seconds this value
> would be lower.
> 
> DR.RESONANCE-at-next-wave-dot-net
> 
> ----------
<SNIP>

D.C.,

Actually, it would be closer to 13 ohms for the first few firings when
the filament was cold... it rises to 144 ohms only at full operating
temperature. A 10:1 resistance change is a bit non-linear for sure. I
wonder if a carbon-filament lamp would have less of a resistnace swing?
Would be a shame to blow up an antique bulbs tho...


-- Bert --

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