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Old 30th Jul 2007, 2:32 pm   #1
Radio_Dave
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Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,478
Default Testing an output transformer

I have a push pull output transformer which had an o/c primary winding. Luckily the break was near the surface and I was able to solder it.

I measured the DC resistance, either side of the centre tap and there's a difference of about 30 ohms. I know this doesn't mean alot, but because something caused the break I want to test it properly... but I'm not sure how.

If I apply a small AC voltage to the secondary should I get an identical voltage reading, either side of the centre tap on the primary or is there an acceptable variance?

Thanks
David
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