Michael Thats going to be quite the clock. Very unfortunate but thats what happens the Cs dry up. I seriously messed with a much older CS and was able to get a few more C's out of the tube. The 5071 is smart so not sure any of what I did makes any sense. Basically heating the oven to a slightly higher temperature. The other point that may not be of interest is that even dead 5071s seem to have a great deal of value. Regards Paul WB8TSL
On Thu, Jun 30, 2016 at 8:51 AM, Matus Michael <[email protected]> wrote: > I have an old HP 5071 Cs-standard here on my desk. The oven of the > (second) tube has lost its Cs completely so the instrument is no longer > working. Since the electronic is quite old we acquired a complete new 5071A > (now from Symmetricom). > > I tried to "reactivate" the HP as a fancy desktop clock without success. > Tried different commands on the serial bus but was not able to switch off > the fatal error states (which is ok for the proper use). It is not possible > to set Time and Date, nor perform a synchronisation. The display just stays > dark. Also the reference oscillator is driven to one end causing a horrible > frequency stability. > > Does somebody know a procedure to override the error states so that the > display works with a depleted CBT by programming? I do not want to modify > the hardware. And to state it explicitly: I do not need a actual > time/frequency standard just a mockup for my desk. > > Michael > > Dr. Michael Matus > ------------------------------------------------------------- > BEV - Bundesamt fuer Eich- und Vermessungswesen > Leiter des Referates Dimensionelle Groessen, Frequenz, Zeit > (Head of Section, Dimensional Quantities, Frequency, Time) > Tel. +43 1 21110-6540, Fax +43 1 21110-996000 > 1160 Wien, Arltgasse 35, Austria > [email protected] > www.bev.gv.at > ------------------------------------------------------------- > _______________________________________________ > 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. > _______________________________________________ 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.
