> > If you REALLY wanna know... heh heh... take a few power strips, plug into
> > 1 20 amp circuit, slowly add pm 2's (or 3's) until the circuit breaker
> > trips.
> >
>
> This is the worst advice I've seen Jake write! Heres a place to start:
Oh you actually thought I was SERIOUS!?!?!?!?!?!?!!??!?!?!?!?!?!?!?!?!?!
excuse me but !?!?!?!?!?!?!?!?!?!?!?!?!?!?!??!!?!? hoo hoo hoo
?!?!?!?!?!?!?!?!?!?!?!?!?!?!??!!???!?!?!?hee hee hee
!?!?!?!!!!!!!!!!!!!!!!!!snort gasp choke on coffee!!!!!!!!!!!!!!!!!!!!!!!1
> http://www.exide.com/serack.htm
They make batteries. Didnt know they made sps/ups's...
> My personal picks are Exide and Toshiba. If you have an existing setup of
> equipment that you need to move to a UPS you can measure it using a power
> strip and a current loop attachment around one of the (power carrying)
> conductors. However, to get a correct measurement you need to use a
> digital multimeter (with current clamp attachment) that supports true RMS
> readings. Now if you want to "do it right" buy or rent something like:
I like Sola because they are TRUE UPS's, however they generate a square
sine wave and can damage older equipment. At least the older ones
we have. They are large, 200 lbs plus but are 2kva and greater. Modems
dont have a problem with it. Sometimes SPS's (which are usually
incorrectly labeled as UPS's) dont CLAMP fast enough and if some finicky
modems get a power fluc, the drop carrier. We use Tripplite here mostly
now. They are SPS's but according to PC MAG, have one of the fastest
clamping times, 2 to 4 ms's. Im not too impressed with APC's.
> http://www.fluke.com/handheld/266.htm
Got bux?
> Read the (lightweight) section "Why True-rms?"
>
> With PC and workstations that use switch mode power supplies you are not
> measuring a simple (60Hz) sine wave. PC power supplies will take a "bite"
> out of the A/C waveform when then turn on - put enough PCs on a single
As does alot of office equipment. Laser printers are copiers are pretty
nasty.
> circuit and this bite will be visible on an oscilloscope. Choosing a UPS
> is no longer a simple task.
>
> One other feature to watch for: Static Bypass Switch (SBS). This is an
> electronic switch which bypasses the UPS circuitry in the event of a UPS
> internal failure and connects the load directly to the incoming power. It
> will also bypass the UPS in the event of an overload situation, which
But thats only on true UPS's which will be more expensive. Our true UPS's
buzz annoyingly as well. Sounds like the SBS is the opposite of the switch
found in an SPS.
> protects the UPS itself and still keeps the load powered up. (Like when
> the cleaning crew plugs in a big floor polisher into one of your UPS wall
> sockets.) Toshiba also monitors the switching transistors heat sink temp.
> So, if you overload your UPS by adding extra computers in little steps
> (like gradual system expansion) the UPS may run for several minutes (or
> hours) before activating the SBS.
Does it alarm or warn you of this situation? That would be essential. A
nice addition to a UPS or SPS I would think would be a power cunsumtopn
meter on the side with a needle and red area...
> Exide also has some cool software to monitor the UPS and even an ethernet
> option for their UPS. This is great if you hate dealing with serial
> devices!
Oh great, now someone can Ip spoof your UPS!?
~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~
Jake Messinger 713-772-6690 jake@ams.com
Advanced Medical Systems, Inc. jake@uh.edu
9919 S. Gessner #201
Houston, Texas 77071 http://www.ams.com/~jake
~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~'`^`'~*-,._.,-*~