From owner-freebsd-current Wed Mar 12 8:34: 0 2003 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C20E637B401 for ; Wed, 12 Mar 2003 08:33:59 -0800 (PST) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1671143FAF for ; Wed, 12 Mar 2003 08:33:59 -0800 (PST) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.12.7/8.12.7) id h2CGXvux054578; Wed, 12 Mar 2003 10:33:57 -0600 (CST) (envelope-from dan) Date: Wed, 12 Mar 2003 10:33:57 -0600 From: Dan Nelson To: Poul-Henning Kamp Cc: "Andrew P. Lentvorski, Jr." , James Satterfield , current@FreeBSD.ORG Subject: Re: Time drift. Message-ID: <20030312163357.GG34322@dan.emsphone.com> References: <23484.1047449678@critter.freebsd.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <23484.1047449678@critter.freebsd.dk> X-OS: FreeBSD 5.0-CURRENT X-message-flag: Outlook Error User-Agent: Mutt/1.5.3i Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In the last episode (Mar 12), Poul-Henning Kamp said: > In message , "Andrew > P. Lentvorski, Jr." writes: > > >An $8.00 wristwatch has much better time accuracy that your multi-$100 PC. > > That's because the crystal in your wristwatch is cut specially so that it > has a flat temp-co at about 23-16 C, whereas the xtal in your computer > is has a gradient all the way from 0 to 70 C. > > See: > http://www.corningfrequency.com/library/vig/Vig-tutorial_files/frame.htm http://www.corningfrequency.com/library/vig/vig-tutorial.pdf http://www.corningfrequency.com/library/vig/vig-tutorial.ppt -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message