[time-nuts] Thunderbolt performance vs temperature sensor

John Miles jmiles at pop.net
Tue Mar 10 07:03:05 UTC 2009

> Hello Said,
> Attached is a screen dump of a run that John Miles did.  You can
> see that the envelope of the DAC voltage follows the temperature
> curve (inversely).   On a finer scale the DAC voltage follows the
> PPS error.  This plot was done with the unit locked to GPS.  I
> believe the time scale is 10 secs/pixel (1 hr per major
> horizontal division).

Here's a somewhat-clearer example:

Each point is 108 seconds, so the entire screen width is about 24 hours.
The yellow temperature and green DAC curves are rather strongly correlated!

-- john, KE5FX

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