Testing bridge rectifiers Help??

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End2end
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Testing bridge rectifiers Help??

Postby End2end » Sat Jan 07, 2017 12:23 pm

Can anyone tell me, Is there a quick way to test a bridge rectifier without an oscilloscope? I only have a hand held multi-meter....not that I know how to use it properly. :? :lol:
They arrived today and I wanted to just make sure they work before committing them to soldering up to the actual circuit they will go into.
Thanks
End2end
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Roger (RJ)
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Re: Testing bridge rectifiers Help??

Postby Roger (RJ) » Sat Jan 07, 2017 1:29 pm

Highly unlikely to be faulty, they are pretty robust. Just stick it in circuit.

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Flashbang
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Re: Testing bridge rectifiers Help??

Postby Flashbang » Sat Jan 07, 2017 1:39 pm

If new they will work OK.

Simplest if you really want to test is to apply an AC supply to the two AC connections and using a multimeter set onto DC volts range see if you're getting DC out correctly on the + and - terminals, which should be around 1.5volts less than the measured AC input volts.
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Teedoubleudee
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Re: Testing bridge rectifiers Help??

Postby Teedoubleudee » Mon Jan 30, 2017 10:45 am

A bridge rectifier is just 4 diodes connected and packaged for convenience as per the attached diagram. If you know how to test a diode you can use this diagram o test individual components.
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End2end
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Re: Testing bridge rectifiers Help??

Postby End2end » Mon Jan 30, 2017 11:05 am

Sorry I forgot to post my findings.
How to test was easier than I though. Just test continuity across the + and - pins and then do the same on the 2 ~ pins.
If there's no continuity on both tests it works. Any continuity and the componant is a dud.
(Getting my monies worth out of my new multimeter already! :mrgreen: )
Thanks
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Suzie
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Re: Testing bridge rectifiers Help??

Postby Suzie » Mon Jan 30, 2017 12:22 pm

If you have a diode test mode on your meter (many have it as part of the continuity test) just connect the + and - terminals together and measure the diode voltage between the two ~ terminals both ways round. It should be two diodes worth, usually around 1.3V but can be a bit higher or lower.

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