[time-nuts] HP 5071A second life

Tom Van Baak tvb at LeapSecond.com
Thu Jun 30 10:06:03 EDT 2016

>From the front panel: Top -> Clock -> Set -> Display:ON
The same menu page also allows you to set the HH:MM:SS time.
This can be done within a few seconds of power up, regardless if the CBT is warming up, dead, or alive.
The amber attention LED will remain lit, but a dead CBT should not affect the red LED time display.


----- Original Message ----- 
From: "Matus Michael" <Michael.Matus at bev.gv.at>
To: <time-nuts at febo.com>
Sent: Thursday, June 30, 2016 5:51 AM
Subject: [time-nuts] HP 5071A second life

>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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