Kurt Albershardt wrote:
Scott Dorsey wrote:
Richard Crowley wrote:

I wouldn't trust most "surge protectors" under those conditions.
I'd seriously consider UPS units for real isolation from line sags
and faults. IMHO, a cheap UPS offers more protection than an
expensive surge protector (assuming a REALLY EFFECTIVE,
no-hype "surge protector" even exists.)


Not really. You'd be surprised at just how little protection stuff is
in the typical standby UPS systems... and you're still connected directly
to the AC line until the power goes out and the relay cuts you over.

Put a 'scope on the output of your UPS sometime when it is running on
batteries. Check both normal and common-mode noise if you can. Be afraid.

Sure, but who cares about that? Since the standby UPS only cuts on
the inverter when the power is lost, it can produce really crappy output
and be fine, since all you really need it for is to shut the computer
system down cleanly. Sure, it produces lots of RFI and throws trash into
everthing, but when the power goes out you have more things to worry
about than the fact that your tracking session is interrupted.

If you need it for more... maybe you need to be using an online unit
with a sine wave inverter.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."