Hi
Well, you need to leave a lot out to keep it brief.
The answer is “somewhere in the 1x10^-10 to 1x10^-11 range. As long as you
are not stating a tau or a confidence factor, any number in that range could be
right.
=====
Based on having done this a lot of times there are a couple of ways to present the
numbers.
-
Fractions of a hertz. Since you get into mili and micro pretty fast, along with a bunch
of decimals this can indeed loose people pretty fast. If the environment is one where
multiple frequencies will be used / considered / discussed, fractions of a hertz gets
a bit crazy.
-
Scientific notation. Obviously, this is a common choice. Since the exponent is ever
changing it also can tangle people up,
-
Engineering notation. IF everything can be kept in one magic range, this usually
works best. Talking about 100 ppt and 0.1 ppt ( or ppb or ppm) seems to get the point
across without generating an enormous disconnect. You have one discussion about
what a ppt is and then move on.
…. back to gazing out over lovely Loveland CO.
Bob
Hi
Well, you need to leave a lot out to keep it brief.
The answer is “somewhere in the 1x10^-10 to 1x10^-11 range. As long as you
are not stating a tau or a confidence factor, any number in that range could be
right.
=====
Based on having done this a lot of times there are a couple of ways to present the
numbers.
1) Fractions of a hertz. Since you get into mili and micro pretty fast, along with a bunch
of decimals this can indeed loose people pretty fast. If the environment is one where
multiple frequencies will be used / considered / discussed, fractions of a hertz gets
a bit crazy.
2) Scientific notation. Obviously, this is a common choice. Since the exponent is ever
changing it also can tangle people up,
3) Engineering notation. *IF* everything can be kept in one magic range, this usually
works best. Talking about 100 ppt and 0.1 ppt ( or ppb or ppm) seems to get the point
across without generating an enormous disconnect. You have one discussion about
what a ppt is and then move on.
…. back to gazing out over lovely Loveland CO.
Bob
> On Oct 2, 2019, at 12:32 PM, David Van Horn via time-nuts <time-nuts@lists.febo.com> wrote:
>
> I'm writing up a presentation for some sales guys, and I need the typical frequency error of the thunderbolt in marketing friendly terms like "plus or minus X millihertz"
>
> What would that number be? Short term only.
>
> --
> David VanHorn
> Lead Hardware Engineer
>
> Backcountry Access, Inc.
> 2820 Wilderness Pl, Unit H
> Boulder, CO 80301 USA
> phone: 303-417-1345 x110
> email: david.vanhorn@backcountryaccess.com<mailto:david.vanhorn@backcountryaccess.com>
>
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