Hi: Came across US patent 4,899,117 "High Accuracy Frequency Standard and Clock Sytem" by John Vig, Feb. 6, 1990. http://www.google.com/patents?id=068BAAAAEBAJ&dq=4899117
In the background section he says: "For example, in one of the most popular Rubidium frequency standards on the market, the manufacturer provides a C-field adjustment range equivalent to +1.5E-9. The aging rate of the standard is specified as 2E-10/year. Consequently, at the specified aging rate, the limited C-field adjustment range limits the useful life of this Rubidium frequency standard to 1.5E-9/2E-10 or 7.5 years." Which standard is he reffering to? -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
