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Test/Measure Transformer

 
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ponytailedgrl



Joined: 06 Oct 2009
Posts: 1

PostPosted: Tue Oct 06, 2009 5:29 pm    Post subject: Test/Measure Transformer Reply with quote

I have a transformer on a circuit board of my GE range. I'm measure 110AC on the pimary side but on the secondary side there are 4 pins, marked 5,6,7 and 8. It should have 24 DC volts coming out of it. From what I can remember in one of my undergraduate class, the 2 pins on the primary measure 110 AC and the secondary should have 2 wire that read 24 DC. I have 4 pins coming out of the secondary. Two that measure 11 while the other two pins have 24. This is measure under a load. I did check the resistance it was okay. Any suggestions to testing the transformer?
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jts1957



Joined: 24 Nov 2008
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PostPosted: Tue Oct 06, 2009 9:18 pm    Post subject: Reply with quote

Voltage at transformer "pins" is always AC. Wink
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PostPosted: Tue Oct 06, 2009 11:29 pm    Post subject: Reply with quote

Always? Sweetie I thought I had located a replacement part that had 24v for the secondary winding. Does that explain why there are 4 connections out of the secondary? Taking it from AC and turn to DC by way of some diodes on a connected board? Then it seems to run back to the original board to some relays. and then back to the transformer?
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jts1957



Joined: 24 Nov 2008
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PostPosted: Wed Oct 07, 2009 12:08 am    Post subject: Reply with quote

Just because a transformer has a mess of pins, does not mean it has to use all of them. Wink
AC out of transformer can be rectified by one diode (half-wave) or by two diodes (full wave). It can also be rectified by four diodes (full wave bridge).
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PostPosted: Wed Oct 07, 2009 5:01 am    Post subject: Reply with quote

One "set of pins" has 24vac while the other has like 3vac. What is happening is the relays are switching back off after a few mintues. The coil will energize and the oven will get hot but then a few mintues later the relay cuts off? Does that sound like a leaking e-cap or a bad diode?
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