[TriLUG] [OT] Strange Beep from Back-UPS XS 1200

William Sutton william at trilug.org
Wed Jan 22 07:31:40 EST 2014


+1 on battery replacement request and another +1 on BatteriesPlus.  I've 
done this a couple of times with their help and always been satisfied.

William Sutton

On Wed, 22 Jan 2014, Peter Neilson wrote:

> On Wed, 22 Jan 2014 00:30:35 -0500, Brian Weaver <cmdrclueless at gmail.com> 
> wrote:
>
>> For the last few weeks I've been trying to track down a very low, almost
>> inaudible "beep" at my desk. It occurs on about a 3 second interval.
>
>> After powering off a lot of equipment, crawling around my desk, and placing 
>> my
>> ear to just about every piece of gear I at the desk I've isolated it to the 
>> APC Back-UPS XS 1200 under my desk.
>
> I think it wants you to replace the battery. The good folks at BatteriesPlus 
> will have one that matches. Lead-acid cells seem to die after about three 
> years.
>
> The sound from such devices is very frustrating. We can locate sounds by 
> using a difference in the delay of a mix of high-pitched frequencies as they 
> reflect off the curled channels of the outer ear. The usual explanation of 
> location, binaural hearing, is insufficient, as it does not explain vertical 
> location. Sound that does not contain a mix of high frequencies is difficult 
> to locate.
>
> In the early 1980s the British phone service, which I believe was at that 
> time HM's Post Office, introduced new desk phones that used a 
> single-frequency beeper instead of mechanical bells. There was a news report 
> or comedy on TV showing someone frantically picking up phone after phone of 
> the dozen or so in a group of closely arranged desks, trying to find out 
> which one was ringing.
> -- 
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