>>> So your frequency drift in this example is 1.7e-11 / month.

>> Not quite, you need to take the sign of the frequency
>> difference into account.

> But the sign of the difference would be obvious from the rotation
> direction of the Lissajous.   

Only if you remembered to include the direction when you took the first 
measurement and if you connected the scope up the same way a month later.


-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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