The Datron 1081/1082 are 7-1/2 digit meters. The zeners are two pair of two
zeners in series to get the ref voltage up high enough. In the two 1081s I had,
they worked quite well, ref’d to the two Fluke 732As I had at the time. But not
8-1/2 digit grade, I don’t think. I have no idea what the
Jan,
Thanks for a good summary f the pros/cons. Of course the LTZ1000 is much
closer to the current state of the art, but the REF102 is far easier to
use and to calibrate. I'm definitely not shooting for sub-ppm
performance, if I can build anything that stays within (say) 20 ppm
long-term,
I believe the 1281 uses the LTZ1000. The datasheet mentions dual references.
My 4920 has both a ltz1000 and a lm399. I think you can find pics of the
1281 dual ref setup on eevblog.
I would not be surprised if the 8508a has a similar configuration.
Todd
On Saturday, December 20, 2014, Richard
On 20 Dec 2014 21:18, Joel Setton set...@free.fr wrote:
Jan,
Thanks for a good summary f the pros/cons. Of course the LTZ1000 is much
closer to the current state of the art, but the REF102 is far easier to use
and to calibrate. I'm definitely not shooting for sub-ppm performance, if I
can
