[time-nuts] [Bulk] Re: New Guy, has HP 5061A with DATUM 7105A tube seeks advice

paul swed paulswedb at gmail.com
Thu Nov 6 15:46:27 UTC 2014


actually all good advice but allow the pump to work for at least 2 weeks

On Thu, Nov 6, 2014 at 8:39 AM, Scott McGrath <scmcgrath at gmail.com> wrote:

> The datum tubes are fairly common as they were significantly less
> expensive than HP/Agilent tubes and lasted longer
>
> First thing as JL notes is to remove battery and charger
>
> Just power it up and monitor the ion pump value on the test meter if it
> drops to zero fairly rapidly the tube may still be good
>
> Depending on length of storage this may take up to a week to settle to zero
>
>
>
> Sent from my iPhone
>
> > On Nov 6, 2014, at 7:54 AM, "J. L. Trantham" <jltran at att.net> wrote:
> >
> > I agree.  Plug it in and see what happens although I would probably
> disconnect and remove the NiCd batteries and inspect for and clean up any
> leakage issues.  I would also remove A2, the battery charger board, until
> initial tests are completed.  A2 is the center board seen from the bottom.
> >
> > I suspect the plug you have is correct.  You probably have to
> disassemble it, rotate the 'insert' to the proper orientation for the
> socket on the back, 'file out' a small 'ridge' in the proper 'orientation
> groove'  on the 'insert' that will allow the 'insert' to be reinstalled in
> the 'housing', then reassemble the plug.  Make sure the electrical pins and
> sockets 'line up' (A to A, B to B, and G to G) between the insert and the
> socket on the back of the unit.  I had to do that on mine.
> >
> > Good luck.
> >
> > Joe
> >
> > -----Original Message-----
> > From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Azelio
> Boriani
> > Sent: Thursday, November 06, 2014 6:39 AM
> > To: Discussion of precise time and frequency measurement
> > Subject: [Bulk] Re: [time-nuts] New Guy, has HP 5061A with DATUM 7105A
> tube seeks advice
> >
> > It is not uncommon that replacement tubes are not the original ones. See
> here:
> > <http://www.gigatest.net/datum/cesium_tubes.pdf>
> > You can't do anything else than plugging it in and check the various
> voltages. If there is any life left in the tube and the ion pump is
> working, you can even experience a locked status in hours (tens of hours,
> maybe).
> >
> >> On Thu, Nov 6, 2014 at 8:21 AM, Wayne Holder <wayne.holder at gmail.com>
> wrote:
> >> I recently picked up a 5061A surplus, but have no idea whether it
> >> works or not.  The first hurdle is getting a power cord, but I'm still
> >> waiting for the proper connector to show up (the first one I ordered
> >> had the wrong orientation on the 3 pins.)  In the meantime, I've been
> >> reading though what materials I can find online in order to figure out
> >> how to  try and safely turn it on and see if the tube is OK, or dead.
> >>
> >> However after removing the top cover, I can see that my unit doesn't
> >> seem to contain the typical kind of cesium tube assembly I see in the
> >> HP docs I've found online.  Instead, it has a tube made by DATUM with
> >> the following markings on the label:
> >>
> >> Model: 7105A
> >> Serial: 9951991226
> >> Part No: 03667-501
> >> Oven Temp: 92 degrees C
> >> Oven Monitor Therm: 101 Ohms
> >> EMV: 2000 DC
> >> NSN ______ 5960 01214 7475
> >>
> >> Can anyone tell me about this model and why it might have a DATUM tube
> >> rather than the kind I see in the HP oc?  Also, any advice on how to
> >> safely check it out?
> >>
> >> I bought this thing out of curiosity but, upon looking inside at all
> >> the various dials and switches and multi-turn potentiometers, I find
> >> I'm rather intimated by it, even though I have a fairly decent
> >> background in electronics.
> >>
> >> Wayne
> >> _______________________________________________
> >> time-nuts mailing list -- time-nuts at 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 at 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 at 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 at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>



More information about the Time-nuts_lists.febo.com mailing list