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

[Jack-OF-Blades]

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 ^^

 

[Cons29]

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

 

[Jack-OF-Blades]

If i want to test the voltage of the 12v during full load, can i run my computer normally while measuring ?

 

[Cons29]

as far as i know it is safe. electricians do these things all the time.

 

[Jack-OF-Blades]

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 ?

 

[hunter315]

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.html#peripheral

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.

 

[ko888]

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.

 

[Jack-OF-Blades]

But the cable of the multimeter can't go in these holes, what i'm supposed to do ?

 

[ko888]

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.

 

[Jack-OF-Blades]

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 ?

 

[ko888]

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 ?

 

[Cons29]

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