[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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