At 5/23/2006 02:06 PM, you wrote:
>If you decide to use an 85 deg C oven, you must get the crystal cut for
>that temperature.
Yes, I've noticed some short-term aging problems with crystals run at 50
C. In one case the crystal was held at 35 C for a couple of years, then
sat on the shelf for a few more. When put back into service at 50 C, it
drifted up about 2 PPM over a period of a couple of days.
So it seems that even moderately heated crystals need to be aged at their
operating temperature.
Bob NO6B
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