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Measuring CPU Voltage with DMM - How?

post #1 of 7
Thread Starter 
I bought this DMM - Click It's not the best but it's still something because i'm too afraid to push my OC without knowing my real voltage(Asrock Z77 Extreme4,really poor software readings)
I saw a picture showing i have to put the cables on this pins :

1)Looking at the cables and the DMM itself,i don't understand a thing.I understood the black wire goes in COM(last hole in my DMM) ,but where does the RED one goes? In the first or in the second?
CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality
2)And on which option should i have the DMM? From what i've read,it has to be on DCV 20,correct?
3)The wires from the DMM are something like needle at the end,should i just put it in contact with the pins of my motherboard ? I've heard ppl grouding their multimeters and making them stay connected without non-stop holding them...
4)Can i short out something?
Thx in advance!
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post #2 of 7
1) Red cable should be in the bottom of the 2 holes for voltage readings.
2) Depends what the max voltage you plan on reading is and how exact you want it to get. Under 2V use 2000m between 2-20V use 20 both in the DCV section.
3) You should be able to use any ground on the motherboard for the black wire but the red will have to stay on that pin specifically to get the reading you want.
4) YES! Be very careful to only touch the one pin you want. Never touch more than one pin at a time with one of the probes. Be aware of static just like any time your working on the computer.

EDIT: This is info about using the multimeter. I'm not an Intel guy so I have no idea about which pins etc.
Edited by *the_beast* - 3/22/13 at 8:16am
    
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post #3 of 7
Thread Starter 
CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality
Look at the end of the wires.How am i supposted to ground this thing to something? I think i don't understand the right meaning of the verb "ground" .English is a foreign language for me,so excuse me for the dumb question but: Isn't grounding= like making the wire stay connected to the pin as if it's with a duck tape?
All the DMM's i've seen have that sort of finish of the cable.I expected it to be something like the things with which you power a accumulator,with two pinches.Do i just have to hold the needle finish of the cable in contact with the pins?
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post #4 of 7
Ground in this case is just the other side of the circuit. So no need to attach in any permanent/semi-permanent way. The red one will definitely have to be held since it has to be on that specific pin and since that's the case I would suggest just holding the black one as well.

Some GPUs are coming with adapters where you can leave the DVOM hooked up and continuously watch voltage but I haven't seen any motherboards that have anything like that.
    
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post #5 of 7
IMO just go at the capacitors right under the VRM area, put one probe on one leg and one probe on another leg(of the same cap), if the reading is negative then change the probes around. DOn't short anything with the probes and deff don't touch the tips of the probes together after you have already touched the legs of the capacitors.

If you want to just ground, you can ground at the PSU's black wires, the difference in the ground might be big, like 10mv or as small as 2-3mv, depending on the location of the VRM's ground.
    
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post #6 of 7
I've put some isolation tape around the metal on the DMM "needles" so that only the tip is just barely visible. Prevents me from accidently causing a short, and actually it also helps with keeping the probes in place, as the isolation tape doesn't fit tightly at the bottom and thus creates a small gap, which limits its movement around the pins once you've "connected" to one.
post #7 of 7
also some places sell needle tips for DMMs, they are just attachments which are like needle like which you can hook up to the tip of your DMM probes. I really like those because you can probe anywhere really, even on some legs of PWMs and such, but you can also mess stuff up big that way(don't ever short a PWM output with a ISEN pin(current sense)).
    
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