> I've noticed that the emphasis on this list seems to be placed on
> fast measurements of short-term drift. I'm more interested in long
> term drift, so I use a clock accumulator to measure drift over
> months (no setup has lasted a year, yet).
>
> Why is the focus on short-term drift?
>
> Bill
I've noticed that the emphasis on this list seems to be placed on
fast measurements of short-term drift. I'm more interested in long
term drift, so I use a clock accumulator to measure drift over
months (no setup has lasted a year, yet).
Why is the focus on short-term drift?
Bill Hawkins
__
Brooke,
Let me clarify this a bit more.
> It's my understanding the a properly working Cs standard probably has it's
> frequency slightly off from perfect, but does NOT have any drift in
> frequency.
Agreed. Over a month there should be no obvious
frequency drift in a Cs standard. However, from
Brooke,
Correct, with a Cs standard you can expect that there
will be no long-term drift in frequency. However if you
look at the short-term you will often see trends that
look like drift. In your S/N 1227 plot both red and blue
show trends on the order of 3 to 4 days. You are wise
not to call thi
From: "Arnold Tibus" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] GPS failure...
Date: Tue, 7 Feb 2006 22:47:59 +0100 (MET)
Message-ID: <[EMAIL PROTECTED]>
> Hello Magnus,
Hi Arnold,
> was there no small hole on the lower side, underneath,
> was it blocked by the little spider?
No, the hole I
Hi Tom:
The plot with red and blue is the old data on s/n 1227 where the red
points are from LORAN-C and the blue points from GPS.
s/n 1227 = http://www.pacificsites.com/~brooke/pdf/Cs_Drift0429.pdf
from April 29, 2005.
This might be a clue to the problem I'm now having with s/n 1013.
http://w
> --- Ursprüngliche Nachricht ---
> Von: Magnus Danielson <[EMAIL PROTECTED]>
> An: time-nuts@febo.com
> Betreff: [time-nuts] GPS failure...
> Datum: Mon, 06 Feb 2006 21:43:09 +0100 (CET)
>
On Mon, 06 Feb 2006 21:43:09 +0100 (CET), Magnus Danielson wrote:
>
> Today the little mystery of why we l
Brooke,
> For the last couple of weeks it has shown a parabolic plot like s/n
> 1227, although this time the polarity is opposite that of s/n 1227 which
> also showed drift, but that may be a setup difference. A plot of s/n
> 1227 is at: file:///C:/Webdocs/pdf/Cs_Drift0429.pdf
This plot has
Brooke,
> For most of the test the SR620 was using it's internal oscillator and
> just recently I changed it to the PRS10 external standard but that does
> not seem to have made any difference.
Correct. Since your time interval values are on the
order of 1 microsecond or less the accuracy of th
Hi John:
No, the plots are of the raw data. Comparing this morning (8:27) @ 892
ns with yesterday morning (8:27) @ 858.2 gives a linear slope of 3.7E-13.
This may be the Ultra Stable Oscillator, but I don't see how changing
the C-field would effect it. That is, if the C-field is changed then
Hi Brooke --
Did you remove any linear offset before generating thorse plots? They
sure look a lot more like an Xtal aging with offset removed, than a Cs.
I wonder if it might be related to your use of the 1MHz output, rather
than 1pps, to drive the stop input. Maybe you're slipping cycles du
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