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Thread: Low voltage on the 12V rail in a brand new Cx450

  1. #41
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    ^what can we conclude from this?Is my psu functioning properly?Isn't 11.7v rather low for a new dc-dc psu like my cx 450?

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    The power supply may be delivering the correct voltage and the 0.3V drop may be due to the cable. My guess is that the unit is fine.

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    0.3V its to much for cable drop.
    If The line regulation its not normal for this PSU, its not O.K. IMO.
    although In absoulte terms, its normal voltage.

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    yeah,something doesn't seem right about this psu.I think it might be defective.

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    Quote Originally Posted by none77 View Post
    0.3V its to much for cable drop.
    If The line regulation its not normal for this PSU, its not O.K. IMO.
    although In absoulte terms, its normal voltage.
    Perhaps so, but the calculator

    https://www.supercircuits.com/resour...rop-calculator

    claims a 0.32V drop when running 20 amp on 2 ft of 16 gauge cable (lower end power supplies use 18 gauge) and these seem realistic figures for such a power supply; although in an ATX supply there are two +12V lines, and eight ground returns.
    Last edited by ashiekh; 01-02-2018 at 03:47 PM.

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    The cable he checked wasn't with 20 Amps.
    The load regulation whas low, with low load and high load.

  7. #47
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    Quote Originally Posted by none77 View Post
    The cable he checked wasn't with 20 Amps.
    The load regulation whas low, with low load and high load.
    Anyhow (regardless of the case here), I guess that without Kelvin contacts (sense wires) one can expect quite a voltage drop

    My guess is that future power supplies will produce only one voltage and conversions will be done on the mother board, then voltage drops are not so critical; my two HP Compaq 8000 Elite Convertible Minitower PCs have power supplies that produce 12V only.
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    Last edited by ashiekh; 01-02-2018 at 10:58 PM.

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