Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!know!tegra!vail
From: vail@tegra.COM (Johnathan Vail)
Newsgroups: sci.electronics
Subject: Re: Do Halogen lamps need ballasts?
Message-ID: <1806@atlas.tegra.COM>
Date: 3 Dec 90 19:10:04 GMT
References: <75525@iuvax.cs.indiana.edu>
Organization: Tegra-Varityper, Inc., Billerica, MA
Lines: 36
In-reply-to: commgrp@silver.ucs.indiana.edu's message of 30 Nov 90 22:42:43 GMT


In article <75525@iuvax.cs.indiana.edu> commgrp@silver.ucs.indiana.edu (BACS Data Communications Group) writes:

   Halogen lamps do not need ballasts, however, large halogen lamps and 
   arrays of lamps are sometimes connected in series with low-inductance, 
   high-current, air-core "inrush chokes" to protect switch contacts:  
   Resistance of metal increases with temperature; there is significant 
   difference between tungsten's cold resistance and its resistance at 
   halogen-lamp operating temperature.

I posted a question about some halogen trak-lights.  I have found a
few more things out (like the bulbs still work). To re-cap my earlier
post and pose the question differently:

 * I bought a set of trak lights and some 110v halogen bulbs
 * the bulbs didn't work in the fixture so I tested the bulbs with
   a meter and they read open.  it was easier than trying another
   fixture.  I assumed something killed them
 *  The bulbs are now known good and the original problem is solved
   (the fixture contact needed adjusting)

MY QUESTION:

Why does the bulb read open on a 20 meg scale?

Theory: the rectifier circuit is causing this?

jv


``There's nothing remarkable about it.  All one has to do is hit the right
  keys at the right time and the instrument plays itself.'' -- J. S. Bach
 _____
|     | Johnathan Vail | n1dxg@tegra.com
|Tegra| (508) 663-7435 | N1DXG@448.625-(WorldNet)
 -----  jv@n1dxg.ampr.org {...sun!sunne ..uunet}!tegra!vail


Brought to you by Super Global Mega Corp .com