[rescue] Re: [geeks] THIS. MAKES. ME. SICK.
rescue at sunhelp.org
Wed Jun 13 21:52:48 CDT 2001
On Wed, 13 Jun 2001, James Sharp wrote:
> Erk...he got lucky. UPS-to-UPS usually starts breaking things & letting
> magic smoke out.
If the source UPS is a cruddy square-wave ("modified sine" my ass) then
this will give you problems. Going from a sine-wave UPS of sufficient
capacity (read: minimum 2x capacity of the UPS plugged into it) should
give no problems.
Most high end UPS' generate a very good approximation of a true sinewave
(<%1 THD) regardless of whether they're online designs or not. A standard
consumer unit is usually nothing more than a 60Hz square wave, roughly
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