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Test using MiltiMeter

post #1 of 13
Thread Starter 
Hey guys after many computer problems I want to double check my powersupply to make sure its not a problem. I've subbed in other Power supplies and received problems but thoes power supplies were also cheaper ones so who knows...

Anyways problem is I have an X-Connect so my cables are a bit different than 24 different wires into a piece of plastic. You can't see what wire color is what... http://www.geeks.com/imageshare/U/15...31600-unit.gif

So basically I want to know how to test my Voltages by using a Multi meter as I don't want to go out and pay 30-50$ for a LCD tester.

Who can help me out???
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post #2 of 13
darn! if you were in the UK I would send to you my multimeter to borrow
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post #3 of 13
WARNING: DON'T DO THIS! IT'S ONLY FOR EDUCATIONAL PURPOSES! YOU COULD FRY EVERYTHING!

I take 2 paperclips. Bend them into an "L" and use electrical tape on most of the clip leaving a little exposed on both ends.

The, shove one end into the MOLEX from the top side (the wire side). It's best if you measure all this with the system running to see if the PSU is drooping or surging. Next, take the other paper clip and shove it in a colored pin. Connect the red multimeter lead to the colored clip and the black lead to the black wire clip. Turn the multimeter to the voltage range you are looking at (i.e. 0-100v). If you don't have alligator clips on your multimeter, tape the meter leads to the exposed paperclip.

Watch the voltage with the machine as you turn it on and as the OS loads etc...you will see the voltage change and shift as you load up the processor eetc. But, it should never go +- 5%. Much better if it's around 2% of the stated voltage.

Wirecolors and voltages:
http://www.pcguide.com/ref/power/sup...oltages-c.html

There is a picture of the voltages and colors. Note some power lines are negative.
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post #4 of 13
You cant see what color the wiring in the harness is, I have one to so I know... Just buy one of these or make one.. They are so cheap I would just buy a couple unless you already have the parts on hand.....ATX Power On Connector
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post #5 of 13
Quote:
Originally Posted by ira-k View Post
You cant see what color the wiring in the harness is, I have one to so I know... Just buy one of these or make one.. They are so cheap I would just buy a couple unless you already have the parts on hand.....ATX Power On Connector
True, depends on the harness. If it's covered in braiding might be difficult. Plus, the PSU might have several rails, so each one would have to be tested separately.

EDIT: OH! The damn Ultras and their silver wire! You would need to use a ATX chart to know which pin is which.
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post #6 of 13
Quote:
Originally Posted by FrankenPC View Post
True, depends on the harness. If it's covered in braiding might be difficult. Plus, the PSU might have several rails, so each one would have to be tested separately.

EDIT: OH! The damn Ultras and their silver wire! You would need to use a ATX chart to know which pin is which.
...
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post #7 of 13
Thread Starter 
So If I have that ATX power on connector, how does t hat help me lol... I was thinking.. I ahve a 20 and 24 pin connector for my PSU considering myrig now is 20 pin but new rig is 24 pin.

What If I picked up one of these.. .http://img424.imageshack.us/img424/6351/wire2el.jpg .... Then attach that to my 20 pin and I'd have all the wire colors... but then I still don't know how to use the multi meter to test. I know you put that black probe onto the black wire, where does the red one go for your different outputs (+-5, 12 etc)...

I'm almost thinking I sohuld buy the LCD meter lol.. or? is there a meter out there that allows you to do basic analog test but also has the ability for you to plug in a multimeter? I think I heard about them before???
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post #8 of 13
Quote:
Originally Posted by Sidious View Post
So If I have that ATX power on connector, how does t hat help me lol... I was thinking.. I ahve a 20 and 24 pin connector for my PSU considering myrig now is 20 pin but new rig is 24 pin.

What If I picked up one of these.. .http://img424.imageshack.us/img424/6351/wire2el.jpg .... Then attach that to my 20 pin and I'd have all the wire colors... but then I still don't know how to use the multi meter to test. I know you put that black probe onto the black wire, where does the red one go for your different outputs (+-5, 12 etc)...

I'm almost thinking I sohuld buy the LCD meter lol.. or? is there a meter out there that allows you to do basic analog test but also has the ability for you to plug in a multimeter? I think I heard about them before???
See my first post. It has a link for the colors. LCD meters are better because some show min/max voltages. That is handy to see sags and surges in the voltage over time.
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post #9 of 13
Quote:
Originally Posted by Sidious View Post
So If I have that ATX power on connector, how does t hat help me lol... I was thinking.. I ahve a 20 and 24 pin connector for my PSU considering myrig now is 20 pin but new rig is 24 pin.

What If I picked up one of these.. .http://img424.imageshack.us/img424/6351/wire2el.jpg .... Then attach that to my 20 pin and I'd have all the wire colors... but then I still don't know how to use the multi meter to test. I know you put that black probe onto the black wire, where does the red one go for your different outputs (+-5, 12 etc)...

I'm almost thinking I sohuld buy the LCD meter lol.. or? is there a meter out there that allows you to do basic analog test but also has the ability for you to plug in a multimeter? I think I heard about them before???

Oh you didn't recognize it...It has all the wiring numbers on it, you just have to look at a chart to see what they are...
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CPUMotherboardGraphicsRAM
E8600 4545Mhz*9 w/1.29V DFI DK P45 XFX 8800 GS D9GKX & D9GMH 
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2x Seagate 160 Perp. RD-1 2x Asus Vista Premium Corsair HX 620 
Case
Open Bench 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8600 4545Mhz*9 w/1.29V DFI DK P45 XFX 8800 GS D9GKX & D9GMH 
Hard DriveOptical DriveOSPower
2x Seagate 160 Perp. RD-1 2x Asus Vista Premium Corsair HX 620 
Case
Open Bench 
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post #10 of 13
Thread Starter 
seems much easier to go an buy a LCD one lol
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Phenom II X4 965 Gigabyte GA-MA785GMT-UD2H Sapphire HD 6850 1GB DDR3 Crucial Ballistix Tracers 4GB 
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Kingston SSD 64GB BENQ DVD-RW Custom W/C Kit Windows 7 Professional x64 
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24" LG LED Logitech Wave Corsair 700W Modular Coolmaster Half-X 
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Title System
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CPUMotherboardGraphicsRAM
Phenom II X4 965 Gigabyte GA-MA785GMT-UD2H Sapphire HD 6850 1GB DDR3 Crucial Ballistix Tracers 4GB 
Hard DriveOptical DriveCoolingOS
Kingston SSD 64GB BENQ DVD-RW Custom W/C Kit Windows 7 Professional x64 
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24" LG LED Logitech Wave Corsair 700W Modular Coolmaster Half-X 
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Logitech MX Revolution 5.1 Surround / Studio Recording Headphones 
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