[iyonix-support] Re: Some Guidance Required Please
- From: Julie <julie@xxxxxxxxxxxxxxxxxxxxxxx>
- To: iyonix-support@xxxxxxxxxxxxx
- Date: Tue, 03 May 2011 08:19:47 +0100
On 30 Apr, Steve Fryatt <lists@xxxxxxxxxxxxxxxxxx> wrote:
> On 30 Apr, Julie wrote in message
> <51cbf543f2julie@xxxxxxxxxxxxxxxxxxxxxxx>:
<snip>
> > My professional curiosity now being thoroughly aroused, I shall have to
> > get hold of the technical references for the Iyo and have a look!
> What you need is a copy of the Power Supply part of the ATX Specification:
> http://www.formfactors.org/developer/specs/ATX12V_PSDG_2_2_public_br2.pdf
Thanks for that!
> If you read that document, you'll understand why I keep pointing out that
> the "5.06V test" is (as John reiterates above) at best a *guide* for the
> *specific* *model* of PSU originally supplied with the Iyonix. Fully
> checking that the outputs of an ATX PSU meet spec by hand can take several
> days, and even on automated kit able to take several measurements a second
> it takes several hours and produces vast amounts of data to sanity check. Of
> course there are shortcuts which will be used for post-production testing,
> but you need to know about the detailed performance of the specific model of
> PSU that you're looking at to be able to use them.
> You also need the correct kit, and it's not the kind of thing that even most
> engineers would have lying around at home. You're looking for fast edges
> and narrow spikes on the output voltages, meaning that a high bandwidth,
> correctly calibrated 'scope and probes is essential. A DVM isn't going to
> be any use.
I've got a scope, and probes. (I also have a logic analyser and other
assorted bits and pieces but I don't expect to use those in this
exercise. ;-) )
> > Things are obviously a lot more complicated these days.
> They have been for a long time: I was helping to design ATX PSUs to an
> earlier revision of the above spec in the late '90s, and AFAIK the
> requirements weren't cutting-edge even then.
You'll be aware of how subdivided and segregated the electronics
industry is (not complaining, just saying) and I never had much to do
with PSU design. My field was largely digital logic (whose
complications are what I was referring to), with a side order of fibre
optics. More recently I lost touch with even that when I went over to
software, VB, C, and so on. Even *that* is out of date now. I don't
know much .NET or C++, for example. And there don't seem to be any
catch-up courses available, I've been looking. (OT: WTH is 'Ruby on
Rails'??)
/rant
Julie
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