[time-nuts] Name That Rb Frequency Standard

Brooke Clarke brooke at pacific.net
Tue Jun 12 10:11:44 EDT 2007


Came across US patent 4,899,117 "High Accuracy Frequency Standard and Clock 
Sytem" by John Vig, Feb. 6, 1990.

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

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