How do you know the primary standard is not off? That is, how do you know it's still "primary"? Maybe a gamma ray burst from a supernova damaged some of the machinery inside, or a colony of crazy ants crawled in and died inside.
D. On Sat, Feb 15, 2014 at 10:10 PM, Joe Hobart <[email protected]> wrote: > > These devices are primary standards; you don't need three; you probably don't > even need two. If certain conditions are met, conditions you can > check/verify, > they will accurately generate the desired voltages. > > What you will probably want are at least three good zener type voltage > standards > and a constant temperature environment. The three will serve as a day to day > standard and reality check on the JJA. And you need to really learn how to > operate the JJA standard, so you can detect and correct any problems. > > Joe Hobart > Flagstaff, Arizona > > > On 2/15/2014 1:17 PM, Gordon DeWitte wrote: >> Clearly need three (or some higher odd number) so they can vote... >> >> Gordon >> >> >> On Sat, Feb 15, 2014 at 2:51 AM, Poul-Henning Kamp >> <[email protected]>wrote: >> >>> In message <[email protected]>, >>> Randy >>> Evans writes: >>> >>>> We'll all probably want a spare unit also. >>> >>> Two, how can you know which one fails, if you only have two ? >>> >>> -- >>> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 >>> [email protected] | TCP/IP since RFC 956 >>> FreeBSD committer | BSD since 4.3-tahoe >>> Never attribute to malice what can adequately be explained by incompetence. >>> _______________________________________________ >> > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
