[time-nuts] The home time-lab

[Charles Steinmetz]

Chris wrote:

> I've never thought UPS were a good idea for anything but a computer
> that needs to shut down gracefully.   For your use you need something
> that cleans up the AC mains power.

A proper "online" (or "double conversion") UPS does just that.  It 
always provides cleanly-generated sine-wave power from a DC-AC 
converter.  Most will even deliver crystal-controlled power (i.e., 
non-synchronous with the AC line) in several frequency increments, if 
you desire, as well as a choice of regulated output voltages.  (For 
obvious reasons, they are usually operated synchronously.)

They are *much* more effective than ferroresonant supplies at removing 
glitches from the mains supply.

You must be referring to "offline" backup supplies.

Best regards,

Charles