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 127x/128x sereis use;
probably the LTZ1000A...
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