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M1BYT  > LIGHTS   15.12.04 22:45l 47 Lines 2033 Bytes #999 (0) @ WW
BID : A73219M1BYT
Read: GUEST
Subj: Re: Fluorescent Lights.
Path: DB0FHN<DB0MRW<DB0SON<DB0ERF<DB0FBB<DB0GOS<ON0AR<ON0AR<7M3TJZ<F6KMO<
      ON0BEL<VK4TRS<GB7YFS<GB7FCR
Sent: 041215/2040Z @:GB7FCR.#16.GBR.EU #:26332 [Blackpool] FBB-7.03a $:A73219M1
From: M1BYT@GB7FCR.#16.GBR.EU
To  : LIGHTS@WW


M1BYT Opined with considerable skill:-
>>    3. How does it work, and what is the funtion of the Starter? 
> 
> This shorts out the tubes such that the filaments are directly across the
> mains. The choke, one end filament, the starter then the other filament form a
> series circuit. The starter when cold forms a short circuit, which makes the
> heaters glow. As the starter warms up, it goes open circuit switching off the
> heaters and causing a high voltage to be presented across the tube and
> (hopefully) its ignition. Once ignited the starter can be removed and the
> light will continue to function.

It has been pointed out to me by an RU3 station in an SP, that I got the above
wrong. That the starter in an unpowered state is open, so I have just done a
bit of research on't web and we are both right. 

Some form a closed circuit when cold (thermal) and unpowered and others are
initially open and close briefly (glow type). So it depends upon the type of
starter. In addition to these there is an electronic type.

Using either type, the same principle applies in that once the tube has struck
the starter can be removed. 

http://tinyurl.com/62kq8

Provides some good basic descriptions of the principles involved.    


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  º   73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU          º 
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  º  International Museums Weekend 18th+19th June 2005  º
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  º The ARC's FL/RAE courses + Newcomers Introduction   º
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