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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