Mailinglist Archive: opensuse (3572 mails)

[Dave Plater <davejplater@xxxxxxxxx>]

Carlos E. R. wrote:
> The Thursday 2008-02-14 at 15:19 +0100, Per Jessen wrote:
>
> > > How do you measure it?
>
> > Hola Carlos
>
> > I'm using one of these:
>
> >
> http://www.order.conrad.com/xl/1000_1999/1200/1250/1253/125319_AB_05_FB.EPS.jpg
>
> Ah, yes. I'd prefer a data sheet in English (or Spanish), but I get
> the idea. :-)
>
> What I'm looking for, and probably the manufacturer doesn't say much,
> is how well they measure spikes, and what about "reactive power" and
> "switch mode" power loads.
>
> A PC uses a switch mode power supply, quite big, taking power in a
> strange waveform, and this may confuse heavily cheap meters (and not
> so cheap). Difficult to say.
>
> A definitive test, in your case, would be to connect a scope on the +5
> and +12 rails (perhaps 3.2? line). A spike going down in the +5 would
> provoke an instant reset.
>
> -- Cheers,
>        Carlos E. R.
Mother boards nowadays use the 12v supply and on board regulators for 
the vcore. Thats why they have extra 12v connectors on board. The 5v
supply is hardly used, the 3.3 is the most important. The 12v is also
used for the mechanics on the hard disks etc, thats why you need a good
12v output on your PSU.
Dave
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