[volt-nuts] New Life of the Solartron 7081

[Михаил (Mickle)]

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