Hi! At last I completed the repairing and modifying the Solartron 7081 DMM: http://bbs.38hot.net/read-htm-tid-36350.html Zener reference was totally dismounted and replaced with DIY LTZ1000 board. Moreover the floating logic PLL clock was made a switchable to crystal oscillator with a lower phase noise. After all, low-frequency noise is halved to 0.028 ppm (better than Keitley 2002, Datron 1271 and Advantest 6581T), TempCo is less 0.2 ppm/C, long-term drift approximation is 1-2 ppm/year. Regards, Mickle T./iddqd2001

Although way above my knowledge and skills, thank you very much for sharing, excellent work and read, Mickle!! Fabio. Il 2013-01-10 10:08 Михаил ha scritto: > Hi! > At last I completed the repairing and modifying the Solartron 7081 > DMM: > http://bbs.38hot.net/read-htm-tid-36350.html > Zener reference was totally dismounted and replaced with DIY LTZ1000 > board. > Moreover the floating logic PLL clock was made a switchable to > crystal oscillator > with a lower phase noise. > After all, low-frequency noise is halved to 0.028 ppm (better than > Keitley 2002, > Datron 1271 and Advantest 6581T), TempCo is less 0.2 ppm/C, long-term > drift > approximation is 1-2 ppm/year. > > Regards, > Mickle T./iddqd2001 > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

I think the preceding article: http://bbs.38hot.net/read-htm-tid-15406.html Is even more interesting! So, why did you post this on a chinese BBS Mickle? (just curious) On Thu, Jan 10, 2013 at 6:02 AM, Fabio Eboli <FabioEb@quipo.it> wrote: > Although way above my knowledge and skills, > thank you very much for sharing, excellent > work and read, Mickle!! > > Fabio. > > Il 2013-01-10 10:08 Михаил ha scritto: > > Hi! >> At last I completed the repairing and modifying the Solartron 7081 DMM: >> http://bbs.38hot.net/read-htm-**tid-36350.html<http://bbs.38hot.net/read-htm-tid-36350.html> >> Zener reference was totally dismounted and replaced with DIY LTZ1000 >> board. >> Moreover the floating logic PLL clock was made a switchable to >> crystal oscillator >> with a lower phase noise. >> After all, low-frequency noise is halved to 0.028 ppm (better than >> Keitley 2002, >> Datron 1271 and Advantest 6581T), TempCo is less 0.2 ppm/C, long-term >> drift >> approximation is 1-2 ppm/year. >> >> Regards, >> Mickle T./iddqd2001 >> >> >> ______________________________**_________________ >> volt-nuts mailing list -- volt-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/** >> mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> >> and follow the instructions there. >> > > ______________________________**_________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> > and follow the instructions there. >

That is quite the reverse engineering effort! Congratulations Mickle! It is good to see such a quality effort paying off. Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -----Original Message----- From: Mark Kahrs <mark.kahrs@gmail.com> To: Discussion of precise voltage measurement <volt-nuts@febo.com> Sent: Thu, 10 Jan 2013 7:38 AM Subject: Re: [volt-nuts] New Life of the Solartron 7081 I think the preceding article: http://bbs.38hot.net/read-htm-tid-15406.html Is even more interesting! So, why did you post this on a chinese BBS Mickle? (just curious) On Thu, Jan 10, 2013 at 6:02 AM, Fabio Eboli <FabioEb@quipo.it> wrote: > Although way above my knowledge and skills, > thank you very much for sharing, excellent > work and read, Mickle!! > > Fabio. > > Il 2013-01-10 10:08 Михаил ha scritto: > > Hi! >> At last I completed the repairing and modifying the Solartron 7081 DMM: >> http://bbs.38hot.net/read-htm-**tid-36350.html<http://bbs.38hot.net/read-htm-tid-36350.html> >> Zener reference was totally dismounted and replaced with DIY LTZ1000 >> board. >> Moreover the floating logic PLL clock was made a switchable to >> crystal oscillator >> with a lower phase noise. >> After all, low-frequency noise is halved to 0.028 ppm (better than >> Keitley 2002, >> Datron 1271 and Advantest 6581T), TempCo is less 0.2 ppm/C, long-term >> drift >> approximation is 1-2 ppm/year. >> >> Regards, >> Mickle T./iddqd2001 >> >> >> ______________________________**_________________ >> volt-nuts mailing list -- volt-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/** >> mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> >> and follow the instructions there. >> > > ______________________________**_________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.

Yes, very impressive - Solartron should hire you as a consultant to design or improve their current products. Ed