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@bev.gv.at www.bev.gv.at -------------------------------------------------------------

>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. /tvb ----- Original Message ----- From: "Matus Michael" <Michael.Matus@bev.gv.at> To: <time-nuts@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@bev.gv.at > www.bev.gv.at > ------------------------------------------------------------- > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

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@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@bev.gv.at > www.bev.gv.at > ------------------------------------------------------------- > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

I have been given a 10MHz oscillator that appears to be in good physical condition but I have no further information on it hence this request. It is marked as follows:- Quartzkeramic 2006/10SCD-531 10.000MHz 12v= K 837383 Any information such as connection details, performance etc. will be greatly appreciated. Regards Peter

Thank you very much. I was too stupid to try the obvious way! Michael > -----Original Message----- > From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf > Of Tom Van Baak > Sent: Thursday, June 30, 2016 4:06 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] HP 5071A second life > > 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. > > /tvb > > ----- Original Message ----- > From: "Matus Michael" <Michael.Matus@bev.gv.at> > To: <time-nuts@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@bev.gv.at > > www.bev.gv.at > > ------------------------------------------------------------- > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >