Robert Benward wrote:
Bob
Boy, you guys are really making me read a lot. I'm digesting Wiki right now.

I see tau, but does identifying a tau of 1E-14 allow you to say you are locked to 10fs? The smallest tau I've seen in my E1938 collection is 1E-1.

Bob

tau is the time over which the measurement is made, typically 1 second or greater.

loosely speaking, the 1e-14 is the average fractional deviation of frequency over that time period.

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