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Old 9th January 2004, 02:46 AM   #1
cm961 is offline cm961  Canada
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Default testing unknown transformers

Hi guys,

I'm working on a studio monitor project and I have a wack of transformers I've pulled from all kinds of equipment. I plan on using toroids from Plitron in the final assembly but I wish to find some transformers suitable out of my surplus pile. Most are EI laminate type (the big, bulky, unshielded kind). I wish to test the transformers to find out their ratios and other characteristics. I'm a 4th year EE but we never really covered transformers (or anything else in the program for that matter...) and I don't really want to just plug them into the mains for fear of blowing a house fuse. Should I use a signal generator and power amplifier as an input signal? And what sort of signal level should I adjust it to?

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Old 9th January 2004, 03:09 AM   #2
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You need a variac.
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Old 9th January 2004, 04:56 AM   #3
sam9 is offline sam9  United States
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The voltages are easy enough to work out. It's the VA rating that always bugs me. That's based on how many amps the transformer can safely take which is a question of heat dissapation. I sdupose you could estimate roughly based on mass but that's likely to have a big margin or error. Testing to destruction is one way but not very satisfying.
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