Have a second to type further. If the systems been off for 6 months it will take a long time for the ion pump to work. Simply watch the current meter and give it 24 or 48 hours. Its very slow. Even give it a week. If the current is coming down at all that is a positive sign. It may be quite small and could take 2 months. Down is good. However that in no way gives you a clue to the quality of the tube for my 2 cents. Regards Paul WB8TSL
On Thu, Nov 6, 2014 at 10:46 AM, paul swed <[email protected]> wrote: > 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 <[email protected]> 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" <[email protected]> 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:[email protected]] 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 <[email protected]> >> 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 -- [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. >> > >> > _______________________________________________ >> > 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. >> > > _______________________________________________ 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.
