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.
