Hi I think if you look at the math, the 0.022 F cap isn’t going to take care of the rated 20 uA current drain for very long.
Bob > On Nov 1, 2014, at 4:59 PM, Brooke Clarke <bro...@pacific.net> wrote: > > Hi Bob: > > When we received new computers from HP and plugged them in the date/time was > correct. > I believe the DS32xx series of RTCs, like those in wrist watches run on > almost no power. > The trick is in getting a super cap with low leakage and low resistance. > The super caps designed to keep memory chips alive may not power anything > needing more than a microamp. > Mail_Attachment -- > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > http://www.prc68.com/I/DietNutrition.html > Bob Camp wrote: >> Hi >> >> I sort of doubt that a GPS aux supply is quite that low current. I have seen >> some RTC’s that won’t last a month on a coin cell. My recollection is that >> the Oncore backup is closer to that category than the “many years on a cap” >> group. >> >> Bob >> >> >>> On Oct 31, 2014, at 9:26 PM, Brooke Clarke <bro...@pacific.net> wrote: >>> >>> Hi Bob: >>> >>> When HP came out with the 300 series Rocky Mountain Basic computers they >>> were fitted with a super cap to power the RTC. >>> I will keep time for some months. >>> http://www.prc68.com/I/HPIB.shtml#300 >>> >>> Mail_Attachment -- >>> Have Fun, >>> >>> Brooke Clarke >>> http://www.PRC68.com >>> http://www.end2partygovernment.com/2012Issues.html >>> http://www.prc68.com/I/DietNutrition.html >>> Bob Camp wrote: >>>> Hi >>>> >>>> The ultra cap is a pretty small one (physical small). You might be able to >>>> find a larger (more farads) one that would fit in the same space. It’s not >>>> going to help for a hours and hours sort of outage. It might get you from >>>> dying in 15 minutes to dying in a half hour. >>>> >>>> Bob >>>> >>>>> On Oct 31, 2014, at 12:42 PM, Tom Miller <tmiller11...@verizon.net> wrote: >>>>> >>>>> I thought so too. There is an ultracap in each unit. >>>>> >>>>> >>>>> Tom >>>>> >>>>> ----- Original Message ----- From: "Mike Seguin" >>>>> <n1...@burlingtontelecom.net> >>>>> To: "Discussion of precise time and frequency measurement" >>>>> <time-nuts@febo.com> >>>>> Sent: Friday, October 31, 2014 12:19 PM >>>>> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, >>>>> Z3811A, Z3812A GPSDO system >>>>> >>>>> >>>>>> I have both of my units sitting on the bench. I found that I needed to >>>>>> connect them together to get the REF1 unit to come out of standby. >>>>>> >>>>>> I am using GPSCon to monitor and it appears to work fine. >>>>>> >>>>>> One thing on my units, when I power cycled them, it started a 'survey' >>>>>> over! I didn't expect that. Are others seeing this. There must be a way >>>>>> to store the surveyed position.... >>>>>> >>>>>> Tnx, >>>>>> Mike >>>>>> >>>>>> On 10/30/2014 3:59 PM, Bob Stewart wrote: >>>>>>> Hi Anthony, >>>>>>> Did you power cycle both units as part of connecting them together at >>>>>>> J5 to J5? And can you remind me whether you are using the supplied >>>>>>> interface cable, or are you using something else? After warmup, the ON >>>>>>> light is on for the REF-0 unit and the STBY light is on for the REF-1 >>>>>>> unit. While running, there is no output from J8 on the unit marked >>>>>>> STBY. J8 works on the unit marked ON. There is a timestamp coming from >>>>>>> J6, and I think a 1PPS signal on some pin or other. >>>>>>> >>>>>>> Bob From: Anthony Roby <ar...@antamy.com> >>>>>>> To: Discussion of precise time and frequency measurement >>>>>>> <time-nuts@febo.com> >>>>>>> Sent: Thursday, October 30, 2014 2:24 PM >>>>>>> Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, >>>>>>> Z3810A, Z3811A, Z3812A GPSDO system >>>>>>> >>>>>>> I'm still having no luck with mine. When I power on, the LEDs cycle, >>>>>>> the Fault light is on and the No GPS and Standby lights flash. When I >>>>>>> connect my GPS antenna, the No GPS light stops flashing and stays on. >>>>>>> After several minutes only the Standby light is on. >>>>>>> >>>>>>> When I connect both the Ref1 and Ref0 together with the interface >>>>>>> cable, the Fault lights on both units are illuminated. >>>>>>> >>>>>>> Do you see the same? I don't know what to infer from the Fault light >>>>>>> since there is no supplemental data to work from. >>>>>>> >>>>>>> Anthony >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> 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. >>>>>>> >>>>>> -- >>>>>> >>>>>> 73, >>>>>> Mike, N1JEZ >>>>>> "A closed mouth gathers no feet" >>>>>> _______________________________________________ >>>>>> 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. >>>> _______________________________________________ >>>> 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. >> _______________________________________________ >> 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. _______________________________________________ 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.
