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-----Original Message----- From: "[email protected]" <[email protected]> Sent: 6/16/2017 11:00 AM To: "[email protected]" <[email protected]> Subject: time-nuts Digest, Vol 155, Issue 27 Send time-nuts mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics: 1. Re: Powering up a long inactive 5061A (Pete Lancashire) 2. Re: Powering up a long inactive 5061A (Scott McGrath) 3. Re: Powering up a long inactive 5061A (paul swed) 4. Re: Powering up a long inactive 5061A (Bill Hawkins) 5. Re: Powering up a long inactive 5061A (Charles Steinmetz) 6. The clocks at Windsor Castle, UK (Bill Hawkins) 7. Re: The clocks at Windsor Castle, UK (Bob kb8tq) ---------------------------------------------------------------------- Message: 1 Date: Thu, 15 Jun 2017 11:23:48 -0700 From: Pete Lancashire <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Powering up a long inactive 5061A Message-ID: <caa-f0u_dbbdxudy_xjcwlrq_9mfpa4vtukffqaf3wfv2dki...@mail.gmail.com> Content-Type: text/plain; charset="UTF-8" Did' not see the 'variac' A variable autotransfomer more then likely we burn up something in the power supply. This applies to pretty much all high equipment that is more than just TV Repair shop gear or anything designed by HP after around the mid to late 60's. If power supply regulation exists, and is anything more then a gas discharge regulator, don't use a variac. On Wed, Jun 14, 2017 at 11:02 PM, Hugh Blemings <[email protected]> wrote: > Hi, > > I've been assisting with the cataloguing and, where possible, testing of a > bunch of test equipment from a deceased estate. > > One of the items is a 5061A which best I can tell has not been powered on > for over a decade. The High Performance tube has a warranty expiration > date of 1988. Serial number is 1936A01567 and has Option 01 and 04 and has > the digital rather than analogue clock. Minor but it's missing the bottom > cover. > > My intuition is to set it to one side until I can become familiar with the > operating manual and potentially bring power up to it slowly with a Variac > or similar. > > I'd be curious as to the time-nuts view on whether this degree of caution > warranted ? > > I suspect the Cs tube is long dead, but maybe I'll be pleasantly surprised > ? > > Would welcome feedback on sensible/cautious first steps with the unit - > initial need, if possible, is a "simple" go/no go/does it power on ? > > Cheers/73 > Hugh > VK3YYZ/AD5RV > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > ------------------------------ Message: 2 Date: Thu, 15 Jun 2017 15:20:10 -0400 From: Scott McGrath <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Powering up a long inactive 5061A Message-ID: <[email protected]> Content-Type: text/plain; charset=us-ascii First you will need to power it up in Cs Off state and monitor the ion pump current by periodically switching to Cs On If you have a possibly good tube ion pump current should drop to zero in a few days to 3 weeks Thats your first step > On Jun 15, 2017, at 2:02 AM, Hugh Blemings <[email protected]> wrote: > > Hi, > > I've been assisting with the cataloguing and, where possible, testing of a > bunch of test equipment from a deceased estate. > > One of the items is a 5061A which best I can tell has not been powered on for > over a decade. The High Performance tube has a warranty expiration date of > 1988. Serial number is 1936A01567 and has Option 01 and 04 and has the > digital rather than analogue clock. Minor but it's missing the bottom cover. > > My intuition is to set it to one side until I can become familiar with the > operating manual and potentially bring power up to it slowly with a Variac or > similar. > > I'd be curious as to the time-nuts view on whether this degree of caution > warranted ? > > I suspect the Cs tube is long dead, but maybe I'll be pleasantly surprised ? > > Would welcome feedback on sensible/cautious first steps with the unit - > initial need, if possible, is a "simple" go/no go/does it power on ? > > Cheers/73 > Hugh > VK3YYZ/AD5RV > > _______________________________________________ > 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. ------------------------------ Message: 3 Date: Thu, 15 Jun 2017 16:16:17 -0400 From: paul swed <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Powering up a long inactive 5061A Message-ID: <cad2jfahryt0ugkalk3f7xnjyz0rqpj-xcjjofoxssicfgs5...@mail.gmail.com> Content-Type: text/plain; charset="UTF-8" Scott far better then my response. Right to the point. Regards Paul WB8TSL On Thu, Jun 15, 2017 at 3:20 PM, Scott McGrath <[email protected]> wrote: > First you will need to power it up in Cs Off state and monitor the ion > pump current by periodically switching to Cs On > > If you have a possibly good tube ion pump current should drop to zero in a > few days to 3 weeks > > Thats your first step > > > On Jun 15, 2017, at 2:02 AM, Hugh Blemings <[email protected]> wrote: > > > > Hi, > > > > I've been assisting with the cataloguing and, where possible, testing of > a bunch of test equipment from a deceased estate. > > > > One of the items is a 5061A which best I can tell has not been powered > on for over a decade. The High Performance tube has a warranty expiration > date of 1988. Serial number is 1936A01567 and has Option 01 and 04 and has > the digital rather than analogue clock. Minor but it's missing the bottom > cover. > > > > My intuition is to set it to one side until I can become familiar with > the operating manual and potentially bring power up to it slowly with a > Variac or similar. > > > > I'd be curious as to the time-nuts view on whether this degree of > caution warranted ? > > > > I suspect the Cs tube is long dead, but maybe I'll be pleasantly > surprised ? > > > > Would welcome feedback on sensible/cautious first steps with the unit - > initial need, if possible, is a "simple" go/no go/does it power on ? > > > > Cheers/73 > > Hugh > > VK3YYZ/AD5RV > > > > _______________________________________________ > > 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. > ------------------------------ Message: 4 Date: Thu, 15 Jun 2017 17:27:57 -0500 From: "Bill Hawkins" <[email protected]> To: "'Discussion of precise time and frequency measurement'" <[email protected]> Subject: Re: [time-nuts] Powering up a long inactive 5061A Message-ID: <91FE6B8569614722A5E51C41C5EDE1F2@system072> Content-Type: text/plain; charset="us-ascii" The first thing you should do is to check the condition of the power fuse. If it is blown or missing, you have some work to do looking for the cause of the fuse trouble. If you are concerned about old electrolytics in the power supply, and you can't check them for capacitance when off, there is an alternative to using a Variac. Cut one wire of an extension cord in order to put a lamp socket in series with the load. If line power is 120 volts, put a 100 watt bulb in the socket. Turn on the unit and be ready to turn it off again if the bulb lights at near or full brilliance. If it does, you have the same work to do as if the fuse had blown. If it starts bright and dims, you may be forming electrolytics. If the bulb maintains the same brightness, try a bigger bulb - or disconnect the ovens. You definitely need to read the part about running the ion pump. Bill Hawkins Disclaimer: I haven't tried this on an HP5061. You could still damage the switchers. You can't detect open capacitors this way. -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of Hugh Blemings Sent: Thursday, June 15, 2017 1:02 AM My intuition is to set it to one side until I can become familiar with the operating manual and potentially bring power up to it slowly with a Variac or similar. ------------------------------ Message: 5 Date: Thu, 15 Jun 2017 18:33:25 -0400 From: Charles Steinmetz <[email protected]> To: [email protected] Subject: Re: [time-nuts] Powering up a long inactive 5061A Message-ID: <[email protected]> Content-Type: text/plain; charset=utf-8; format=flowed Hugh wrote: > Would welcome feedback on sensible/cautious first steps with the unit - > initial need, if possible, is a "simple" go/no go/does it power on ? You may find the information on this page helpful: <http://www.ko4bb.com/doku2015/doku.php?id=precision_timing:how_to_check_an_hp5061a_cesium_standard> Best regards, Charles ------------------------------ Message: 6 Date: Thu, 15 Jun 2017 21:37:55 -0500 From: "Bill Hawkins" <[email protected]> To: "'Discussion of precise time and frequency measurement'" <[email protected]> Subject: [time-nuts] The clocks at Windsor Castle, UK Message-ID: <A33B1572E7204E78823D3FCC5156BD0D@system072> Content-Type: text/plain; charset="us-ascii" Happened to watch a PBS/BBC program called "Queen's Castle" episode 102 - Four Seasons, that was filmed in 2005 at Windsor, not Buckingham. One of the segments was about the castle timekeeper, Steve Davison. He's responsible for 450 clocks, some 300 years old. His biggest challenge is the end of British Summer Time, when each clock must be advanced 11 hours, stopping until striking finishes. Old clocks were not designed for Fall Back. Takes him 16 hours. There was a brief shot of his workshop, with a clock repair in progress. No sign of a time standard. No discussion of leap seconds, either. Tried to find him, but only found a 2013 ad for a time keeper to maintain 1000 clocks in various castles. Hope that wasn't too far off topic. Bill Hawkins ------------------------------ Message: 7 Date: Fri, 16 Jun 2017 09:09:48 -0400 From: Bob kb8tq <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] The clocks at Windsor Castle, UK Message-ID: <[email protected]> Content-Type: text/plain; charset=utf-8 Hi I would claim that anybody with 450 clocks to tend is indeed a Time Nut ….:) Bob > On Jun 15, 2017, at 10:37 PM, Bill Hawkins <[email protected]> wrote: > > Happened to watch a PBS/BBC program called "Queen's Castle" episode 102 > - Four Seasons, that was filmed in 2005 at Windsor, not Buckingham. > > One of the segments was about the castle timekeeper, Steve Davison. He's > responsible for 450 clocks, some 300 years old. His biggest challenge is > the end of British Summer Time, when each clock must be advanced 11 > hours, stopping until striking finishes. Old clocks were not designed > for Fall Back. Takes him 16 hours. > > There was a brief shot of his workshop, with a clock repair in progress. > No sign of a time standard. No discussion of leap seconds, either. > > Tried to find him, but only found a 2013 ad for a time keeper to > maintain 1000 clocks in various castles. > > Hope that wasn't too far off topic. > > Bill Hawkins > > _______________________________________________ > 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. ------------------------------ Subject: Digest Footer _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ------------------------------ End of time-nuts Digest, Vol 155, Issue 27 ****************************************** _______________________________________________ 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.
