[time-nuts] HP 5071A second life

paul swed paulswedb at gmail.com
Thu Jun 30 10:07:33 EDT 2016


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 <Michael.Matus at bev.gv.at>
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
> michael.matus at bev.gv.at
> www.bev.gv.at
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