At Sunday, October 23, 2005 9:21 PM, Tom Clark wrote: > Going in the other direction, the mechanical resonant frequency > changes with time because, as the xtal vibrates, microscopic cracks in > the structure of the quartz break apart. Running at high power makes > the crystal generate these microscopic faults at a faster rate; this > then causes the oscillator to have poorer long-term stability. When an > xtal is left vibrating (oscillating) in an undisturbed environment, > the rate of cracking of the quartz decreases, and the oscillator is > said to "age" to its final frequency. > But if you subject that same crystal to a mechanical jolt will force > some new cracks and re-start the aging "diffusion" process. Ditto > turning the oscillator on & off or a thermal shock can aggravate the > aging.
Could someone confim or deny an idea I posted some weeks before about ageing is more predictable on free running oscillators than in disciplined ones?. I read about it in a Simetricomm datasheet some time ago, but I would like to know experimental or theoretical explanation for that (or the contrary). Best regards Luis Miguel _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
