[time-nuts] Super stable BVA Quartz resonators... BVA??
Bernd T-Online
BNeubig at t-online.de
Sun Dec 9 09:44:27 EST 2007
Javier wrote:
> Anyway, a 10544 oscillator has a cold
> offset that can easily be of 1000Hz, so if at 80 deg. C the offset is
> zero, and at 25 deg. C the offset is 1000Hz, you easily have a rough
> 15Hz/deg C average tempco in that range - and the aging drift for this
> oscillator is quite less than that.
The 10544A incorporates an AT cut crystal. The tempco is far away from
being linear. From room temp to the oven temperature it follows a 3rd
order parabola, which has its minimum at the oven temperature. This
"trun-over tempearture" varies from unit to unit, which means that the
slope of f(T) also changes form unit to unit.
Not the best approach for measuring temperatures ;-)
At the other hand, the current consumption of the 10544A decreases
fairly linear with temperature, so this is a better (but rather slow)
temperature sensor, which would even work without the quartz...
Regards
Bernd
DK1AG
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