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Article #21775Re: Re: Converting a florescent hood
From: Frank Ball
Date: Wed, 13 Dec 1989 03:55
Date: Wed, 13 Dec 1989 03:55
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*From: richard@gryphon.COM (Richard Sexton) *Subject: Re: Re: Converting a florescent hood *Newsgroups: alt.aquaria,sci.electronics,misc.consumers *In article <21670@adm.BRL.MIL> moss@brl.mil (Gary S. Moss (VLD/VMB) <moss>) writes: *>Recently, I learned something regarding rapid-start ballasts and flourescent *>fixtures; certain, if not all such ballasts, require that a strip of metal *>grounded to the ballast be roughly within 1 inch of the bulb along its entire *>length. * *Does anyone know why ? I would suspect it is for the starting circuit. They use a high voltage spike to ionize the gas inside, the spike is applied between the pins on the end of the tube and the ground strip. This sounds very similair to the triggering of a xenon flash tube, which have a trigger electrode that is connected to the outside of the glass tube. Frank Ball frankb@hpsad.HP.COM
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!hplabs!hpl-opus!hpnmdla!hpsad!frankbReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!hplabs!hpl-opus!hpnmdla!hpsad!frankb From: frankb@hpsad.HP.COM (Frank Ball) Newsgroups: sci.electronics Subject: Re: Re: Converting a florescent hood Message-ID: <1840020@hpsad.HP.COM> Date: 13 Dec 89 03:55:31 GMT References: <23152@gryphon.COM> Organization: HP Signal Analysis Division - Rohnert Park, CA Lines: 18