[volt-nuts] 7071 noisy?

[Jean-Louis Noel]

Hi Mickle,

From: "Михаил (Mickle)" <timka2k at yandex.ru>

> 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