From owner-freebsd-questions@FreeBSD.ORG Thu Oct 17 05:45:08 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id E263DB1B for ; Thu, 17 Oct 2013 05:45:08 +0000 (UTC) (envelope-from ralf.mardorf@alice-dsl.net) Received: from mail33c50.megamailservers.eu (mail223c50.megamailservers.eu [91.136.10.233]) by mx1.freebsd.org (Postfix) with ESMTP id 3BCF22351 for ; Thu, 17 Oct 2013 05:45:07 +0000 (UTC) X-Authenticated-User: ralf.mardorf.alice-dsl.net Received: from [85.182.18.222] (e182018222.adsl.alicedsl.de [85.182.18.222]) (authenticated bits=0) by mail33c50.megamailservers.eu (8.13.6/8.13.1) with ESMTP id r9H5iv5W016805 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 17 Oct 2013 05:44:59 +0000 Message-ID: <1381988697.5852.16.camel@archlinux> Subject: Re: UPS buying suggestion From: Ralf Mardorf To: freebsd-questions@freebsd.org Date: Thu, 17 Oct 2013 07:44:57 +0200 In-Reply-To: References: <525F0138.1020304@fjl.co.uk> <20131017093820.6a8428de@X220.ovitrap.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-CSC: 0 X-CHA: v=2.0 cv=fcYaPTsF c=1 sm=1 a=9ZWckcQGoISGt69KENXXDw==:17 a=ALKwz0t7uJUA:10 a=IkcTkHD0fZMA:10 a=rsIYsMhsAAAA:8 a=8-3U5OmvWyEA:10 a=n708INcB1CWsgRiXbL4A:9 a=QEXdDO2ut3YA:10 a=9ZWckcQGoISGt69KENXXDw==:117 X-CTCH-RefID: str=0001.0A020202.525F795B.00AB, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 X-CTCH-VOD: Unknown X-CTCH-Spam: Unknown X-CTCH-Score: 0.000 X-CTCH-Rules: X-CTCH-Flags: 0 X-CTCH-ScoreCust: 0.000 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Oct 2013 05:45:09 -0000 On Wed, 2013-10-16 at 23:23 -0600, Warren Block wrote: > Computer power supplies are not as sensitive as they once were, and > the switchover time of standby UPSs is almost certainly adequate. I don't own an UPS. Sometimes we've got blackouts here, long enough to effect a CRT monitor, but not always the computer is effected too. I wonder if it's possible to switch power off and on manually, very fast at a power board, without turning off the computer. I don't want to test it, but it could be possible. > Amusingly, the Smart-UPS provides a cleaner sine wave than comes out > of the wall. Filters?! I didn't read the link. Mains are polluted by lots of crap, e.g. by all the switching power supplies ;). I should mention that I was an audio and video engineer a long long time ago. IMO the quality of the power from the mains is much more important for audio and video, than for computer and even for audio and video it's significance often seems to be overrated. Likely that the capacitors in the power supplies of my home studio, that are much older than 20 years, are dried out, but I never repaired an old power supply, because there are no audible effects. Sure, the quality of the power should be good, but IMO it sometimes is overrated, just to have another value that can be used for advertisings. 2 Cents, Ralf