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Old 07-15-2005, 12:34 PM   #1 (permalink)
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Default using a multimeter to measure voltage on a power supply

how do i do this to test how much voltage is comming from my power supply in the different spots?
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Old 07-15-2005, 12:37 PM   #2 (permalink)
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Just connect the postive alligator clip or lead to the pins on the molex connectors, and the ground lead to the case or to the pin that is attached to the black wire.
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Old 07-15-2005, 12:40 PM   #3 (permalink)
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i took the power supply out of my case.so i just plug it into the wall switch it on and put the positive on the positive and the ground on the ground?
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Old 07-15-2005, 12:44 PM   #4 (permalink)
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also how much voltage is suppose to be going through the connectors that hook up to the hard drive and the cd rom and the vid card(the little 4 pin connector)?
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Old 07-15-2005, 12:45 PM   #5 (permalink)
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That is correct.

Also, just to prewarn you: Never take apart a PSU. There is enough current flowing through the inside of a PSU to kill you.

It is, on the otherhand, perfectly safe to test the voltages on anything outside of the PSU.
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Old 07-15-2005, 12:47 PM   #6 (permalink)
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Another thing to remember is that the black wires are ground, while the red should put out +5v, and the yellow should put out +12v. A little varience in the voltages is okay, but not much more than a volt or volt and a half.
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Old 07-15-2005, 12:54 PM   #7 (permalink)
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thanks im a teenager and am still learning the electronics
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Old 07-15-2005, 02:16 PM   #8 (permalink)
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Quote:
Originally posted by silence782
Another thing to remember is that the black wires are ground, while the red should put out +5v, and the yellow should put out +12v. A little varience in the voltages is okay, but not much more than a volt or volt and a half.
I think you mean .1 or .15. Undervolting 1 volt is going to seriously kill your computer.
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Old 07-15-2005, 07:10 PM   #9 (permalink)
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Quote:
Originally posted by Elbatrop1
Also, just to prewarn you: Never take apart a PSU. There is enough current flowing through the inside of a PSU to kill you.
Yep! That includes when it is switched off too! Be very careful!

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Old 07-15-2005, 08:01 PM   #10 (permalink)
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lol, hacp....too true....didn't even notice he said that.

HOWEVER....I'm surprised no one even mentioned this...unless you have an OLD *** style PSU you can't simply plug it into a wall and turn it on.

You need to use a paperclip to jump the only green wire in the 20pin connector and the black wire next to it...THEN it can turn on.

http://www.casemodgod.com/cmg/Howto-story--16.html

go there for instructions
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