[RFI] UPS RFI....Ok Ok... now that is a pile up

[bill ny9h]

On 1/19/2012 2:47 PM, Jeff Blaine wrote:
 > Any one have any experience with any of these units, regarding HF 
RFI emission?
the Jim Brown wrote:
Most UPS units operate in STANDBY mode, monitoring the power line and
going into ACTIVE mode only when power fails.

At 10:43 AM 1/20/2012, bill  ny9h wrote:
>I hate that back in 81-83 when i was under contract with
>APC  ,,,introducing a 1 piece product line to distributors ( before
>it shipped) .... APC quickly dropped the term SBS for "stand by
>power"  and  adopted the UPS terminology..  which  means
>uninterruptable power supply.  For many years APC never made or sold
>UPS products. Today they own a large chunk  of even that biz.
>
>an sbs switches over in 'less than' 4 ms; not enough time for a
>computer to detect a failure....and as Jim points out , would then
>make more noise than just charging the battery.
>
>the big UPS advantage , aside from never switching over , as they are
>on all the time, avoiding a failure mode, your stuff does not see the
>line surges, as you ARE MAKING YOUR OWN AC,,,, level of cleanliness
>determined by the design....
>
>I started to write a response earlier but as I have not yet put a
>scope on the output of my 2500VA unit,,,a Powerware , about 85lbs,,,
>I thought i'd wait ...but I hear no rfi from it ,,,
>
>bill
>
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