Tom Duckworth said the following on 01/05/2010 09:10 PM:
Warren- No, a 100% error would be 40 GHz. Where did you get 40.4 GHz?
That would be 101% and of course 80 GHz is 200%.
Bruce- Of course you are right about the + symbol for 40.000 000 003 GHz
(+7.5 parts in 1E-11) but what would you consider current standard
notation. We still Use this metric notation in the US. What do you use?
In the *extremely* pedantic department, I think you would refer to "+7.5
parts in 10e11" or to an offset of "7.5x10e-11". When you're talking
"parts in something" you use a positive exponent since you are referring
to how large a population it takes to get 7.5 whole units. When talking
about fractional frequency offset, you use a negative exponent since
you're referring to a fraction of a unit. (There's probably a much
better way to describe it.)
As I said, it's a very pedantic distinction...
John
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