From digest vol 84 issue 7:
Date: Fri, 1 Jul 2011 13:06:31 -0700
From: Chris Albertson <albertson.ch...@gmail.com>
To: xfor...@citynet.net, Discussion of precise time and frequency
measurement <time-nuts@febo.com>
Subject: Re: [time-nuts] live 50 Hz measurements
Message-ID: <banlktindmf0t_fu3aqupckhrk7uxfqs...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
On Fri, Jul 1, 2011 at 12:46 PM, Will Matney <xfor...@citynet.net> wrote:
>
For accuracy sake, I'd still compare the line freq. to a
standard, but that's just me.
If the computer used for this is also running "ntpd" the computer's
clock is disciplined. How well depends on what ntpd is using as a
reference clock.
Actually, there *are* cases where ntpd is running without complaint
but the local clock is not being disciplined.
The situation I most often run into is that ntpd has been started
with insufficient privilege, and so its tweak-the-clock requests are
being silently ignored by the operating system.
If there is no drift file, the usual symptom is that the clock offset
grows without bound almost linearly.
If there is a valid drift file, the usual symptom is that the clock
offset sways more or less sinusoidally, this being the residue after
the average clock drift is removed.
Joe Gwinn.
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