How To Read Your Power Supply Voltages

Discussion in 'Power Supplies' started by theAnimal, Jan 17, 2009.

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  1. mikeford

    mikeford Diamond Member

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    I've got a box full of old PS, and I would like to quickly weed out the bad ones. I've got three testers, Power and Cooling with a resistor pack and single led, cheap 10 led tester, and deluxe version with a nice backlit display that shows numerical values for 6 things. Using this last tester, some PS have been clearly bad, no start, or voltages too low (like less than 4.7 on the 5v).

    Should I use the voltage ranges in your earlier post, or should I be making some adjustment for no or little load?

    I do plug in a hard drive if a PS looks basically good.

    Most of these are for OLD systems, 20 pin ATX etc., any adjustments on that basis?

    Thanks, good thread.
     
  2. theAnimal

    theAnimal Diamond Member

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    The range is the same regardless.

    No, out of spec voltage is bad for any system.
     
  3. Marcuf

    Marcuf Banned

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    All of this information is well and good Ernie, but I've looked over all your blog entries visible without going to archives and it seems every one is either 100% about the iPhone
     
  4. PreferLinux

    PreferLinux Senior member

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    I think it may be worthwhile to add a comment that 12 V DC is not dangerous. i.e. if you touch any live wire in a computer along with, say, the case (so you are grounded), you won't feel anything unless it is a +/- 12 V wire (yellow or purple), and even then it would be very slight, if noticeable, and would definitely not be harmful. But it is still a good idea to be careful.

    Also, as the case is grounded, it is possibly a good place for the ground probe.
     
  5. cpul

    cpul Junior Member

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    hai.
    I have some questions
    My computer often die suddenly, what power supply can cause this?
     
  6. theAnimal

    theAnimal Diamond Member

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    Probably best to start a new topic & provide more information.

    Either a defective PSU or one that cannot provide enough power could cause crashes.

    Edit: Welcome to Anandtech! :)
     
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  7. rayed

    rayed Junior Member

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    I am always suffering with this problem but know i will try this.
     
  8. suncare

    suncare Banned

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    Thanks. To act now. Take care of my computer.
     
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