Date: Tue, 15 Oct 2013 20:42:34 +0800 From: Erich Dollansky <erich@alogt.com> To: Ralf Mardorf <ralf.mardorf@alice-dsl.net> Cc: freebsd-questions@freebsd.org Subject: Re: UPS buying suggestion Message-ID: <20131015204234.190c8760@X220.ovitrap.com> In-Reply-To: <1381838368.757.50.camel@archlinux> References: <CACo--msUpY-6r7MkuEvrPDpSVdFZyBotSA-eS7aLGMFDeq_vDQ@mail.gmail.com> <20131015134826.528289be@X220.ovitrap.com> <1381838368.757.50.camel@archlinux>
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Hi, On Tue, 15 Oct 2013 13:59:28 +0200 Ralf Mardorf <ralf.mardorf@alice-dsl.net> wrote: > On Tue, 2013-10-15 at 13:48 +0800, Erich Dollansky wrote: > > As you need the current anyway, I would use an ampere meter to > > determine the exact current drawn. I got already some surprises > > there. > > You can do a Ampere measurement, but that doesn't help you, you need > to measure the consumption over a longer period. > > Regarding to the hair dryer, it's an electromotor ;). Which is still harmless compared to the peaks switching power supplies might have even if the power factor is high. I was surprised myself that the hair-dryer worked on one after it 'failed' dramatically on the other one. Still, the most extreme experience related to power factor I ever got was at the beginning of my professional education. A relatively small electrical device has had such a low power factor that its connection to the power outlet made the distrubution panel fly out of the wall. This made me going parnoid about the power factor. As this device was a prototype, some changes have been made before it reached the public. Erich
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