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Thread: Exploding hold-up time measurement

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    Default Exploding hold-up time measurement



    Not all PSUs survive, even under normal ambient. I had quite some time though to encounter such a problem in these tests.

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    What was the PSU that ...collapsed?
    CPU:Athlon 64 FX60 (2-cores) 2,6GHz
    Mobo:Asrock 939a785g
    cpu cooler:ArcticFreezer13 CO
    RAM:4 GB DDR 400MHz
    GPU:Asus 750 Ti 2GB
    PSU:Seasonic Platinum 660
    Monitor:Asus VE228HR
    Tower:Coolermaster Elite 430

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    Default

    Quote Originally Posted by sith'ari View Post
    What was the PSU that ...collapsed?
    Easy! Enermax Revolution X't II. You can tell it's the CWT GPS platform by the look and arrangement of the LLC resonant converter components, and you can tell it's Enermax by the yellow transformer tape. (Other units based on CWT GPS, like Deepcool ST or Thermaltake Smart DPS G, use stock green tape).

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    To be honest, i'm trying to figure out, what the thread's title mean.
    How can "hold-up time" measurements lead to an explosion?
    ( i thought that the only thing that could be affected by "hold-up time" deviations would be motherboard's components and not the PSU itself!! )
    CPU:Athlon 64 FX60 (2-cores) 2,6GHz
    Mobo:Asrock 939a785g
    cpu cooler:ArcticFreezer13 CO
    RAM:4 GB DDR 400MHz
    GPU:Asus 750 Ti 2GB
    PSU:Seasonic Platinum 660
    Monitor:Asus VE228HR
    Tower:Coolermaster Elite 430

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    when you switch on/off a PSU while it outputs full power you highly stress all of its components, especially the primary switchers (and the FETs of the APFC converter).

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    Yipes. Aris, I think there was some confusion because on your older Tomshardware reviews what was holdup time is now AC_LOSS to PWR_OK time and holdup time in your newer reviews is AC_LOSS to DC loss. Any reason why the naming changed? It has caused some confusion because holdup time measured the PWR_OK signal but holdup time now measures the voltage.

    Anyway, it seems holdup time tests and PWR_OK tests are the downfalls of so many PSUs.
    Last edited by turkey3_scratch; 04-24-2016 at 01:58 PM.

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    Geez, I'm afraid Enermax glory days are coming to an end: it's at least since 2011 they're falling down, and now this unfortunate occurrence... in my perception they're nearby the irrelevance in the contemporary "enthusiast" PSUs market.
    Best, Luca

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    both use the phrase "hold-up time". The difference is that one of them includes also the "AC loss to PWR_OK" so it is easy for the users to be confused.

    In the past I only used the "hold-up time" phrase and not the full "AC loss to PWR_OK hold-up time" because I didn't want to confuse readers. However this was inevitable as it seems, since many OEMs don't play fair.

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