Re: Monitor shakes w/ UPS

The UPS does nothing useful to 'clean' AC power. Worse, in
battery backup mode, the typical plug-in UPS outputs power so
'dirty' as to be harmful to power strip protectors. UPS
manufacturers don't like to mention this because any
electrical protection useful on the power cord is already
inside that computer and monitor's power supplies. In short,
you have assumed features in both that power strip and in that
UPS that even their manufacturer's don't claim to provide.

In the meantime, shaking monitors were discussed in the
newsgroup alt.sys.pc-clone.dell on 19 Dec 2004 entitled
"Refresh rate problem with Dell monitor M993S " at
http://makeashorterlink.com/?P288511DA

Installed a plug-in UPS only to protect data from blackouts
and brownouts. That power strip protector only has the same
'protector' circuits as inside the UPS - does nothing useful
as indicated by few joules and other reasons. If you wanted
hardware protection, that is another discussion elsewhere.
None would have anything to do with a shaking monitor.

joe_macdonald25@xxxxxxxxx wrote:
> Hi all,
>
> I have a bit of a strange problem. I have a fairly new, fairly high
> quality 19" monitor that sometime suffers from an annoying "shake".
> Usually it's most noticible in the upper left corner, but sometimes it
> occurs around the entire perimiter of the screen. I recently connected
> it to a SmartUPS 700, but the problem will still occur. I even
> connected a 500 joules surge protector to the outlet which the UPS
> connects to, but the problem STILL occurs. I've taken the monitor to
> other locations and the problem does not happen. I live in an old
> building (>75 yrs old), and I'm betting the wiring is also very old.
> Things like turning on the washer/dryer set this off.
>
> What else can I do to prevent this from happening? Is the APC SmartUPS
> 700 simply not powerful enough to "condition" the line? I know the UPS
> works in terms of being able to keep my equipment online when there is
> no AC power, but it does not appear to be helping w/ preventing these
> spikes/surges (correct terminology?) from reaching my monitor. For my
> own knowledge, why would this be the case?
>
> Thanks for any insight...
>
> joe.
.

Relevant Pages

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