Brooke Clarke wrote: Hi Tom: This is the first I've heard about the cracks. Can you point me to some literature about it so I can do my homework. Thanks, Brooke
Brooke -- My comment last nite was an attempted simplification/synthesis of Vig's topics --- here are some references: Vig is THE MAN WITH THE BIBLE <[1]http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigtoc.htm>. Comments on the Quartz Crystal and how it works are in Section I at <[2]http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigqrtz.htm>. Section III has relevant material on the aging process at <[3]http://www.ieee-uffc.org/freqcontrol/vigaging91/introduc.htm> Vig discusses all the mechanisms in <[4]http://www.ieee-uffc.org/freqcontrol/vigaging91/agingmec.htm#Aging %20Mechanisms.>. Note specially the sections on "Stress/Strain" , "Changes in the Quartz" and "Electrode Effects". Temperature effects on aging are discussed here: <[5]http://www.ieee-uffc.org/freqcontrol/vigaging91/temperat.htm#Tempe rature%20and%20Temperature-Cycling>. For a one-paragraph summary see the last paragraph of <[6]http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigaging.htm> To back up my Power Level+S/N statements, see <[7]http://www.ieee-uffc.org/freqcontrol/quartz/vig/vignoise.htm> Vig's collected papers are $60 at <[8]http://www.stormingmedia.us/16/1688/A168823.html> There is also a good, old (1997, pre-Agilent) HP Application Note 200-2 which I found at <[9]http://my.ece.ucsb.edu/yorklab/Useful%20Stuff/Tutorials/QuartzCrys talOscillators.pdf> Agilent (post-HP) has a good discussion on Precision vs Accuracy, Aging etc at <[10]http://metrologyforum.tm.agilent.com/xtals.shtml>. Hope I didn't confuse people with my simplified, one paragraph explanations! 73, Tom Clark References Visible links 1. http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigtoc.htm 2. http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigqrtz.htm 3. http://www.ieee-uffc.org/freqcontrol/vigaging91/introduc.htm 4. http://www.ieee-uffc.org/freqcontrol/vigaging91/agingmec.htm#Aging%20Mechanisms. 5. http://www.ieee-uffc.org/freqcontrol/vigaging91/temperat.htm#Temperature%20and%20Temperature-Cycling 6. http://www.ieee-uffc.org/freqcontrol/quartz/vig/vigaging.htm 7. http://www.ieee-uffc.org/freqcontrol/quartz/vig/vignoise.htm 8. http://www.stormingmedia.us/16/1688/A168823.html 9. http://my.ece.ucsb.edu/yorklab/Useful%20Stuff/Tutorials/QuartzCrystalOscillators.pdf 10. http://metrologyforum.tm.agilent.com/xtals.shtml Hidden links: 11. http://www.precisionclock.com/ _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts