[time-nuts] Fwd: Re: Frequency Stability of Trimble Mini-T

hasweb at has.org.nz hasweb at has.org.nz
Thu Oct 16 23:05:41 UTC 2008



----- Forwarded message from hasweb at has.org.nz -----
     Date: Fri, 17 Oct 2008 12:02:48 +1300
     From: hasweb at has.org.nz
Reply-To: hasweb at has.org.nz
  Subject: Re: [time-nuts] Frequency Stability of Trimble Mini-T
       To: Mike Monett <XDE-L2G3 at myamail.com>

Quoting Mike Monett <XDE-L2G3 at myamail.com>:

>   "Lux, James P" <james.p.lux at jpl.nasa.gov> wrote:
>
>   [...]
>
>   > Even without  TMR  or other similar  schemes,  the  probability of
>   > upset IS  pretty low. However, as Black or Scholes  said  (I can't
>   > remember which), "One should not confuse very low probability with
>   > impossible". If it absolutely, positively can't take any hit, then
>   > some more work is involved.
>
>   > James Lux, P.E.
>
>   How do you do that? Any web links to study?
>
>   As far  as I know, it is impossible to absolutely  guarantee against
>   metastability. Do you wait a week for the metastability to settle?
>
>   If zero probability of failure is so important, you would  also have
>   to include  the  probability of a solder joint  opening,  or  a chip
>   failing due  to metal migration or latent ESD damage. That  is never
>   zero.
>
>   Of course, after the system is perfect, someone will take it and put
>   it on a destroyer running Windows:)
>
>   Best Regards,
>
>   Mike Monett
>
> _______________________________________________
>
Mike

You could always look at: United States Patent US4820939.
But dont bet on it.

Bruce



----- End forwarded message -----





More information about the time-nuts mailing list