Re: 3 blown Power supply's in 6 months.
- From: w_tom <w_tom1@xxxxxxxxxxx>
- Date: Tue, 10 May 2005 12:50:22 -0400
These undersized power supplies are why the 3.5 digit
multimeter is so much a powerful tool. Simply power up the
machine and measure all critical voltages. Then have machine
access all peripherals simultaneously. Play music on sound
card while each Command Prompt program accesses a disk drive,
CD-ROM, and floppy simultaneously. Access other computer disk
drives on the network. And use the internet. Do all
simultaneously and measure those voltages again. If the power
supply is sufficiently sized, those voltage will remain in the
upper three quarters of those defined voltage limits.
This does not mean the power supply contains other essential
functions - a good condition. But it will identify inferior
supplies - a bad condition. This load test being effective to
identify a sufficiently sized power supply - to confirm what
they claim in writing probably does exist.
What is so often missing in supplies that can't provide the
power as claimed? A long list of written and numeric specs.
Vanguard wrote:
> "w_tom" <w_tom1@xxxxxxxxxxx> wrote in message
> news:427F6BBB.6996448B@xxxxxxxxxxxxxx
>> First thing that power supply must provide is a long
>> list of written and numeric specs.
>
> This is still a user beware situation. Many PSU makers actually lie
> about what load their product will support. They may rate the PSU as a
> 400W unit but include the voltages and their supposed load support when
> those voltages aren't used, or they list an aggregate load for a common
> rail voltage when the combined or simultaneously load will be much
> smaller. That 400W cheapie PSU may only be able to actually support a
> concurrent 200W to 300W load. Figure 50% to 75% of actual wattage
> rating from a cheapie PSU. So you may simply be trying to suck out 300W
> of an actual load from a PSU that can only supply 200W but has a "400W"
> sticker on it. A good PSU will tell you what is the load available per
> tap but also mention if there are any caveats regarding a combined load
> limit across taps.
>
> Just because it says 400W on its sticker doesn't mean it will actually
> support that load level on all its taps at the same time. Not only is
> that a concern but also many cheapie PSU makers will outright lie about
> what load can be safely applied to any tap. There is also the problem
> of excessive ripple. Although many computer components are designed to
> accommodate some ripple, they won't handle it when it is so severe as to
> look like a sawtooth pattern on an oscilloscope. It sounds like the OP
> has been trying to get by on cheap PSUs and then wondering why they
> blow. Sort of like buying the cheapest tires and expecting them to be
> equivalent to the pricey ones. Your PSU provides the lifeblood of your
> computer.
.
- References:
- 3 blown Power supply's in 6 months.
- From: RobW
- Re: 3 blown Power supply's in 6 months.
- From: Jim Macklin
- Re: 3 blown Power supply's in 6 months.
- From: RobW
- Re: 3 blown Power supply's in 6 months.
- From: w_tom
- Re: 3 blown Power supply's in 6 months.
- From: Vanguard
- 3 blown Power supply's in 6 months.
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