Hi Mickle,
From: "Михаил (Mickle)" <[email protected]>
My old measurements (7.5-digits, short, 5-10 minutes):
0.1 V = 0.2 uV
10 V = 5 uV
1) Improper settings of the PLL's nominal frequency (see page 9.5 of the
Service
Manual).
2) Noisy 1N829 Zener.
3) Noisy IC201 (swap to LTC1052 solves this problem forever).
4) Noisy Input Amplifier.
JLN> 0.2µV for 0.1V scale
JLN> 0.4µV for 1V scale
JLN> 8µV for 10V scale
So, mine seems a bit noisy!
I asked that question because if you press "DIG FILT"
it displays to the 10th of fV a bit useless if the short term stability is
not better than 0.2µV!
The web site relating your modification of the Solartron is of line.
I can provide you with a web space if you wish.
Have a good day.
Bye,
Jean-Louis
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