Re: Office XP failure
- From: w_tom <w_tom1@xxxxxxx>
- Date: Wed, 27 Jun 2007 15:11:43 -0700
On Jun 27, 2:17 pm, "Lanwench [MVP - Exchange]"
Not so; a good UPS will do power conditioning, which will indeed protect you
against a surge/spike.
Well let's look at the conditioned power from this UPS. When in
battery backup mode, 120 VAC electricity is two 200 volt square waves
with a spike of up to 270 volts between those square waves. This is a
120 volt sine wave? This is conditioned power? Well it is called a
'modified sine wave'. Therefore the naive 'assume' it is conditioned
power.
Why is that power so 'dirty'? So dirty as to even damage some small
electric motors. Because computers are so robust - contain internal
protection - as to make 'dirty' electricity from "computer grade UPS"
irrelevant.
Meanwhile, when not in battery backup mode, the UPS outputs
substantially 'cleaner' electricity. Why? When not in battery backup
mode, a typical plug-in UPS connects computer directly to AC mains.
It's called a relay. It connects computer either to AC mains
('cleaner' electricity) or it connects computer to battery (modified
sine wave). One could say it does condition electricity; conditions
it to be 'dirtier'.
Don't take my word for it. Post numerical specifications for that
UPS. Don't waste time with half truths from color glossies. Only
facts with merit are numbers in the long list of specs. Where are
numerical specs for rumored 'power conditioning'?
.
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