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How to test the voltage on the 12v rail of a powersupply ?

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  • Power Supplies
  • Cable
  • Powersupply
  • Components
Last response: in Components
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August 15, 2014 1:25:14 AM

Hi !

Welle i bought a multimeter...but i don't know where to plug the cable to measure the voltage of my powersupply.


Thanks in advance for your help ^^

More about : test voltage 12v rail powersupply

a b ) Power supply
August 15, 2014 1:39:53 AM

well, black is ground (-), red i think is 5v the other is 12, just to be safe, just set it at a higher setting .

seriosly, remove the psu to your pc first, disconnect everything, then just to the paperclip trick to start the psu, be careful though, youtube should be helpful here
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August 15, 2014 1:43:54 AM

If i want to test the voltage of the 12v during full load, can i run my computer normally while measuring ?
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a b ) Power supply
August 15, 2014 3:04:12 AM

as far as i know it is safe. electricians do these things all the time.
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August 15, 2014 11:47:13 PM

I can't seem to find the cable to connect the PSU to my multimeter.

I have a Supernova G2 1000w, does the cable is usually in the package ?
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a c 296 ) Power supply
August 17, 2014 12:15:53 PM

There is no "cable to connect the PSU to [your] multimeter". Your meter should have come with leads with metal tips, take a spare molex connector and place one lead in the spot connected to the yellow wire and the other in the spot connected to one of the black wires
http://www.playtool.com/pages/psuconnectors/connectors....

Set your multimeter to DC voltage, often represented by V with a line above it rather than a V with a squiggle above it. This will tell you the voltage back on the PSU side, the actually voltage seen by your CPU VRMs and GPU will be lower due to the voltage drop caused by the current running through the wires to get to them. If you want to see the voltage being fed to your CPU or GPU you should be able to back probe one of their connectors, but you'll want to get skinnier leads than the normal ones that ship with a multimeter.
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a c 1217 ) Power supply
August 17, 2014 12:18:20 PM

The EVGA SuperNOVA G2 1000W doesn't use individually color coded wiring.

Find a EPS-12V CPU power cable or PCI-E Supplementary power cable. Both of those connector types only have +12V and ground wires.
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August 17, 2014 2:37:51 PM

But the cable of the multimeter can't go in these holes, what i'm supposed to do ?
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a c 1217 ) Power supply
August 17, 2014 10:50:17 PM

Jack-OF-Blades said:
But the cable of the multimeter can't go in these holes, what i'm supposed to do ?


The multimeter should have probes that can be inserted into the connectors. The red probe would be inserted into one of the yellow colored symbols shown in the diagram above. The black probe would be inserted into any one of the black colored symbols shown in the diagram above.
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August 18, 2014 1:33:58 AM

The only wire where the probes can be insterted are the " periph cable". I can't insert them in any other cable.
Does the periph wire have a 12v ?
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a c 1217 ) Power supply
August 18, 2014 9:59:48 AM

Jack-OF-Blades said:
The only wire where the probes can be insterted are the " periph cable". I can't insert them in any other cable.
Does the periph wire have a 12v ?


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a b ) Power supply
August 18, 2014 10:17:29 PM

the probes mentioned above should look like big needeles, it does not have to fit tightly, you have to make contact and hold it for a few sec, just enough for you to get a reading. it won't snap together if that's what you're expecting
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