On Sat, Sep 2, 2017 at 5:06 PM, Walter Dnes <waltd...@waltdnes.org> wrote: > On Thu, Aug 31, 2017 at 09:19:00AM -0700, Ian Zimmerman wrote >> On 2017-08-31 08:47, Walter Dnes wrote: >> >> > 1) To protect my gear against power surges/spikes/drops >> > 2) To protect against the rare occurence when power goes off for 1 >> > or 2 seconds >> >> I do the same. Or at least I did until last week, when the UPS died >> after more than a decade of perfect service. (Here, the outages are >> longer than 2 seconds; it's not often, but is very annoying when it >> happens, with the UPS square wave beeps.) > > I just had a second look at your message. Did you say your UPS puts > out ***SQUARE WAVES***? That is very bad for consumer grade electrical > stuff. >
He said the beeps were square waves. That is roughly what mine sound like, though mine is a sine-wave UPS. A lot of stuff can handle square wave power output, though PFC power supplies don't like it as I understand things. I think most of the cheaper UPSs on the market still put out fairly raw inverter output. -- Rich
