Power Supply testing

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June 4, 2009 at 06:19:56
Specs: Windows XP, Celeron / p 4, 512MB
Testing various PSs, I always find that one +5 V light is out, even on a couple of new ones. All the PSs don't seem to have any effect on the performance of the PCs after installation. This test was done on 20 and 24 Pin PSs.
Haven't contacted any Manufacturer yet about this issue.
Thanks for any reply.

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June 4, 2009 at 06:33:02
For the most part, PSU testers are useless. Get yourself a decent multimeter or voltmeter. But voltage only tells part of the story. You need to verify amperage & how the unit stands up under load. But that type of test equipment costs 1000's of dollars.


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June 4, 2009 at 08:30:34
Sounds like a bad or weird tester. You might plug a drive into one of the 4 pin connections and try it again; may not be a load on the +5vdc rail.

And jam's right, those little testers are basically useless.


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June 4, 2009 at 09:19:14
Sure, without the load it only tells ½ the story. However, so far at least, it tells you if a PS is putting anything out or not.
Thanks again.

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Related Solutions

June 5, 2009 at 16:25:30
> Testing various PSs, I always find that one +5 V light is out, even on a couple of new ones.

First, some supplies will output improper or deceptive voltages with zero load. Which ones? That is unique to each switching power supply design. Without a minimal load, some 'good' supplies will appear defective.

Second, a defective power supply may power a computer. Some assume if a new supply boots the computer, then that supply is OK. Obviously false.

More reasons why a multimeter is so useful and why a power supply is best tested (measured) when fully loaded by the computer.

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