[time-nuts] Worst possible error on a rubidium

[Dr. David Kirkby]

If an old random 10 MHz Rubidium oscillator is working (i.e. powers up, and 
eventually locks), what is the maximum possible frequency error it could have?

Could it remained locked with an error of 1 part in 10^7, 10^8, 10^9, 10^10 etc?

I assume there are physical limits which would simply stop it functioning too 
far from the correct frequency, but don't have much clue what they are.

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