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1. Re: [Amps] Testing filament xfmr (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 10 Aug 2005 13:31:05 +0200 (CEST); Simpler is to connect an ampmeter across the secondary, feed the primary from a Variac and wind up the Variac until trhe desired filament current flows. then leave it for a time and see how hot it ge; /archives//html/Amps/2005-08/msg00368.html (7,001 bytes)
2. Re: [Amps] Testing filament xfmr (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Wed, 10 Aug 2005 23:17:58 +0100; The classic short circuit test. agreed It's a long time since I did this, but the short and open circuit tests give you copper and iron losses respectively. I think you can show that theoretically co; /archives//html/Amps/2005-08/msg00392.html (8,342 bytes)
3. Re: [Amps] Testing filament xfmr (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 11 Aug 2005 14:53:17 +0200 (CEST); If it doesn't get too hot on open circuit, the iron losses aren't too high. If it doesn't get too hot on short circuit, the copper losses aren't too high. Probability is that it won't get too hot in; /archives//html/Amps/2005-08/msg00406.html (9,471 bytes)
4. Re: [Amps] Testing filament xfmr (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 11 Aug 2005 09:16:36 -0400; Really the best test is use a load bank so the secondary will pull the maximum rated current. The load bank of course is a large set of resistors. An air cooled transformer for our type work shouldn'; /archives//html/Amps/2005-08/msg00408.html (11,966 bytes)
5. Re: [Amps] Testing filament xfmr (score: 1): Author: David Kirkby <david.kirkby@onetel.net>; Date: Thu, 11 Aug 2005 20:06:41 +0100; But then any transformer that gets too hot open circuit is suspect. I guess if you run the input voltage too low, or run it at 50 Hz when it is designed for 60Hz, then it might get too warm then. But; /archives//html/Amps/2005-08/msg00413.html (9,040 bytes)

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