[time-nuts] HP 106B quartz frequency standard...the story so far
Magnus Danielson
magnus at rubidium.dyndns.org
Thu Aug 6 10:53:49 UTC 2009
Greg Burnett wrote:
> Hi Jim,
> Maybe 5 hours is insufficient time for the oven to stabilize at each new
> temperature setting? If I remember correctly, plotting all the data (and
> waiting for oscillator/oven to stabilize at each incremental temperature
> setting took me >30 days to complete the whole plot? ...This was 25 years
> ago, so my recollection of exact time required for the whole project might
> be off a bit.
> here.
In contrast, good quality OCXOs still have their long term specs
conditioned by a 30 day heat-up period. It is not the oven as such which
heat-up but rather the crystal "aging" mechanisms that got started again.
It's a good exercise to make a long log of the heat-up from power on to
a couple of weeks.
Cheers,
Magnus
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