Dave,
I run
ntpclient -i 300 -c 288 -h $NTPHOST > filename.log
i is the interval 300 seconds - 5 min, c the count 288 equivalent 24h and then
your ntphost address. The log will then have a column for day, seconds, ntp
transaction time. internal delay, clock difference and dispersion from server.
All this is in the how to, where there also are gnu plot commands to obtain
plots but I prefer to use matlab, just a personal preference. hope it helps.
/Polly
--- In Dave Cramer <> wrote:
>
> On Wed, Aug 25, 2010 at 1:08 PM, palito.farias <> wrote:
>
> >
> >
> > Dave,
> > I've let the board collect ntp data for ~24 h and then using that data I
> > was able to adjust for the constantan drift. (I'm using the following client
> > http://doolittle.icarus.com/ntpclient/ that is based on xntpd), during the
> > test runs I also gather other statistics that will give you a fairly good
> > idea of how good your boards time is. If you follow their instructions I
> > believe you are able to get to 10 ms accuracy, my board seems to be able to
> > get close to that. I'm synchronizing two radars with 1000Hz prf hence I need
> > sub millisecond accuracy so they can point at the same volume. But then read
> > Ian's comment and it doesn't look promising for us?
> >
> > Thank you all for your inputs, I appreciate them.
> >
>
> OK, So we are attempting to do pretty much the same thing ( I think ). How
> do you generate a timed event to sample, or do you ?
>
> Dave
>
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