> > From: John Sessoms <[EMAIL PROTECTED]> > Yep. Got a couple of surplus UPS from the telephone company that used to > run PBX systems. AC ->DC charging the batteries, then separate DC -> AC > inverter (sine wave) for the power output. Well filtered. Replacement > batteries are a little on the pricey side, but worth it, and it's only > every 5 years or so. > > They're actually over-kill for the application, but along with some > really good surge protectors protecting them, they provide peace of mind. > > The local power company has gone to some kind of digital metering system > and has a data pulse impressed on the AC cycle. I've had problems with a > couple of cheapo fluorescent fixtures where you could actually see the > lights pulse off every 20 seconds. You could actually see it on a > digital voltmeter as well, but not on the power output side from the UPS.
That would be illegal in the UK. There are very strict requirements laid down as to what voltage and cycles (within very small limits, usually required to be corrected to absolute values over a 24hour cycle) have to be delivered. AFAIR, deviation from a plain sine wave is also not allowed. ----------------------------------------- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software and scanned for spam -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
