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Thread: Best way to test PSU without equipment?

  1. #11
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    Quote Originally Posted by StormShadow View Post
    Suffice to say I don't have an oscilloscope.
    https://www.amazon.com/Thermaltake-A...words=dr+power
    is a basic tester

    Quote Originally Posted by StormShadow View Post
    ... there's something in the back of my mind that says ...
    Concerning your understanding of how computers work
    https://www.amazon.com/How-Computers...computer+works
    is good
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    Last edited by ashiekh; 02-14-2018 at 03:12 PM.

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    Quote Originally Posted by ashiekh View Post
    A basic multimeter can be found for roughly the same price or less and is certainly more useful than that, especially since one can measure other stuff with a multimeter.

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    I agree, but in current measuring mode it can cause damage in the hands of the unaccustomed; and how does one know if voltages are within spec? so I felt the all-in-one tester might be easier.

    I'm thinking to build a load tester with old car headlamp bulbs; total cost less than $2 (postage included)
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    Last edited by ashiekh; 02-14-2018 at 03:39 PM.

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    5v, 3.3v, 12v?????

    Is it really that hard?

    A lot of people use car bulbs as a load tester - rows of old oven elements used to be my cheap way of load testing large sources (50kva+)

    However, mcu and mosfet based load testers are more accurate (busy designing one), as they can maintain a nice and constant output power unlike the two latter which follow ohms law.

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    It is easy, but not for a beginner; that is why I suggested a basic tester that would say if the voltages are in range or not.

    I don't even know what an mcu is... ah, micro-controller

    The car headlamps are for loading the 12V line for hours at a time; I have another loader for all the voltages, but it gets hot quite quickly.
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    Last edited by ashiekh; 02-15-2018 at 11:23 AM.

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    That's a resistive tester. Your power draw will still fluctuate thanks to ohms law. For a computer power supply, it's insignificant, but once you test batteries or have large vdrops it starts to be an issue.

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    All I am after is catching infant mortality by doing a burn-in period; that would be an over-night test using the 12V light bulb load (after the quick test with the multi-voltage load).

    Truth be told, I doubt I will ever use any of this; I have already rebuilt what supplies needed rebuilding, so I am probably done. Recapped and re-oiled, I suspect they will outlast the machines they power.
    Last edited by ashiekh; 02-15-2018 at 05:13 PM.

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