Many important lab references over past 50, 60 years are named and characterized at http://www.ieee-uffc.org/main/history-norton.asp
2.5MHz and 5 MHz seem common as far back as the 1950's and 1960's (and I've used some of them! e.g. Sulzer) and continue through today. Late 60's and early 70's HP benchtop counters used a 1 MHz crystal. e.g. HP 5321B. By the mid-70's HP Frequency counters were using 10MHz references. e.g. Hp 5383A (which for many of us was the defacto bench counter forever) most often in a TCXO can. Tim. On Fri, Aug 2, 2013 at 12:31 PM, Euclides Chuma <[email protected]> wrote: > Hi, > > Why any equipments use 5 MHz and others use 10 MHz reference standard? > > Thanks > > Euclides Chuma > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
