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How to test a power supply ?

Discussion in 'Electronic Design' started by Skybuck, Jun 9, 2007.

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  1. JackShephard

    JackShephard Guest


    Naw... he'll contact the meter manufacturer and have them send him a
    new chip for it.

    Bwuahahahahahahahahaha!
     
  2. JackShephard

    JackShephard Guest


    Data logging, yes... meter updates - never seen it, and it would
    certainly invalidate any calibration done on the meter. Very unlikely to
    be a field service item at the user level in any case.
     
  3. JackShephard

    JackShephard Guest


    That all sounds well and good, however, a Power supply test correctly
    done involves loading it FULLY to its rated spec, and THEN looking at
    each rail to determine that it complies with the ripple spec. It ALSO
    must retain the regulated voltage spec from no load through full load.

    PC supplies are notorious for having monitoring circuitry that will
    shut them down if loading on certain rails changes significantly.

    The right way to test it is with several electronic loads (very
    expensive), and an oscilloscope, and ideally, a power factor test device
    on the input line.

    The ATX supply spec has serious voltage regulation and ripple voltage
    specs, and all are done at full rated loading on the supply.
     
  4. krw

    krw Guest

    Dimbulb, if you want to look so smart why don't you talk about the
    dynamic regulation too. Wot a maroon!
     
  5. JackShephard

    JackShephard Guest

    You're a fucking idiot, KeithTard. I know more about testing power
    supplies than you ever will.
     
  6. JackShephard

    JackShephard Guest

    I did ya fuckin' retard.


    Bugs bunny would smack you for using his line when you are such a lame
    fucking retard.

    Yes, you most certainly are very fucking moronic.
     

  7. And how many people much less shops can afford an Oscilloscope much less a
    device that you can use to run the PSU at full load? Very few indeed. Right
    now the best option for most people is using a voltmeter. Maybe someday I
    will get on the stick and put together a sub 1000 dollar device to do a all
    in one psu test for professionals and shops. Until that day though the
    multi-meter is the way to go.
     
  8. krw

    krw Guest

    How can someone who "knows everything" always be MassivelyWrong?
    Dimbulb, you're priceless. Useless, but priceless, none the less.
     
  9. krw

    krw Guest

    MassivleyWrong again, dimmest of them all.
    You still believe Bugs and the Easter Bunny are real?
    I hear you mommy calling, Dimbulb.
     
  10. Lamey

    Lamey Guest

    Do you?

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  11. Lamey

    Lamey Guest

    Licking the prongs on a 9 volt doesn't count Prongtard.

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  12. JackShephard

    JackShephard Guest

    That's not the point. The point is "to test a power supply" one needs
    to test it at a loading that meets the supply's rated spec.
    That doesn't mean that merely checking the voltage is adequate by any
    measure.
    It is a sad option, since it does not tell one that the supply is good.
    A very OUT of spec supply can still show the proper voltage on all rails,
    and STILL be the source of PC operational failure modes.
    It is not definitive in any way.
    The multimeter merely tell you if the supply is making voltage at the
    current load level, which may be zero or some other number. The fact is
    that PCs load supplies fairly hard on some rails, and those rails need to
    supply CLEAN voltage, not merely THE voltage they claim to produce.

    It really is that simple. A mere voltage test is not in any way
    adequate enough.

    And any shop you claim is professional would know that mere voltage
    testing is not how it is done.
     
  13. mr deo

    mr deo Guest

    SMPS's should come on with no load, and should survive too (it's in the
    specifications)....


    But as for as your +5/+12v line swap, what happen'd, did the psu company buy
    you all new kit?... That would REALLY piss me off and I would be sending
    them flammable dogshit through the post lol.
     
  14. :
    : >
    : > I don't disagree but I do wish I'd had the cheapo $10-$15 ps test
    : > thingie around before I hooked up a RAID array to a brand new Ultra
    : > power supply that shipped from the factory with its +5 swapped with
    : > +12. I didn't bother testing it with a voltmeter ahead of time as I'd
    : > never seen one of these switchers come on without some sort of even
    : > minimal load.
    :
    : SMPS's should come on with no load, and should survive too (it's in the
    : specifications)....

    I wasn't aware of that. Is this part of the ATX spec? As you know
    the old XT supplies wouldn't come on without some sort of load and I'd
    never bothered to see if anything since then would...

    :
    :
    : But as for as your +5/+12v line swap, what happen'd, did the psu company buy
    : you all new kit?... That would REALLY piss me off and I would be sending
    : them flammable dogshit through the post lol.

    I was - am - very unahppy. The power supply is one of these newer
    ones that have male molex fittings on the case for drive power
    cables. (From an Ultra Defenderxxxxx Destroyer case+PS) Some
    knucklehead at the factory soldered one of the five molex fittings
    backwards. The drive array was plugged into the one that was
    backwards so *poof* went all the drives in the array, magic smoke let
    out and all.

    Getting things put right is extremely frustrating. The manufacturer
    (Ultra) initially refused to do anything because they stated that
    during the first 30 days the warranty was serviced by the vendor. The
    vendor (Amazon) after telling me it was my fault I should have checked
    for compatibility before ordering (!), that they were very sorry but
    warranty fulfilment was up to the manufacturer.

    It's been well over 30 days and Ultra is simply not returning my phone
    calls. Although I can reach a tech dude by phone the dude calims he
    can only send a new supply. The supervisor just won't return the
    calls and is never there.
     
  15. mr deo

    mr deo Guest

    : But as for as your +5/+12v line swap, what happen'd, did the psu
    company buy
    I am not sure how big some of these companys are, it's not your fault and
    the power supply company "should" be responsible for this. An open letter
    to the complaints department might help as most staff and managers will
    refuse to touch an issue until there's a formal complaint (it doesnt exist
    until a formal complaint is made)..


    Good luck with that ;)..
     
  16. JackShephard

    JackShephard Guest

    Reversed supply rails are NOT part of ANY spec! That is 100%
    manufacturer defect, and Amazon should remit! and REPLACE the supply and
    anything it fried.
    I'd contact the BBB (about Amazon) with a very diplomatically worded
    letter of how they shirked their responsibility. Amazon IS a BBB member,
    and they will bend to the proper, Politically correctly put pressure.
    They want to get out cheap. Don't fall for it. This ain't damaged
    shipping. I would fully document the supply before sending it back both
    by video and by a tech that is willing to provide an affidavit of the
    supplies non-conformant condition. If they blew gear, the supply AND the
    gear should be replaced. Amazon isn't really responsible since it is a
    true MFGR blunder, and a "catastrophic error" at that. Ultra is
    culpable, just don't let them buy their way out with a mere supply
    replacement, and don't back down. Reversed rails are 100% law suit
    material, and they know it.
    Have an attorney send him an e-mail, and CC the BBB. It's a damned
    shame that these guys make so damned much money, yet they can't fix what
    is obviously one of their ****-ups.
     
  17. : > It's been well over 30 days and Ultra is simply not returning my phone
    : > calls. Although I can reach a tech dude by phone the dude calims he
    : > can only send a new supply. The supervisor just won't return the
    : > calls and is never there.
    : >
    :
    : I am not sure how big some of these companys are, it's not your fault and
    : the power supply company "should" be responsible for this. An open letter
    : to the complaints department might help as most staff and managers will
    : refuse to touch an issue until there's a formal complaint (it doesnt exist
    : until a formal complaint is made)..

    Well I'm starting to see some light at the end of the tunnel. With a
    problem like this I'm faced with a problem of being just one guy and
    having no leverage with the warrantors. Initially amazon was
    amazingly resistent to doing anything, but I've finally managed to
    reach a very cordial lady in their executive offices who walked this
    through their buyer and helped me make contact with Ultra's
    salesperson.

    I *think* I may be a couple of weeks away from being made whole
    again. The fallback is to just do the small claims court thing and
    the have large amounts of fun trying to execute on the judgment I'll
    undoubtedly get.

    Appreciate your, JackShephard, and GMAN's responses. I'll follow up
    with an update in a week or so to hopefully report that Ultra stood
    behind their product.
     
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