I have several Tektronix DM5120 6 1/2 digit DVMs (actually a repackaged
Keithley design) that I have been checking against the Malone Xicor voltage
standard. Over the last year or so, it has proven to be rather stable (either
that or it and the four meters are drifting in sync)... much better than the
specs would suggest. The Tek meters ARE in need of a real calibration (along
with a dozen or so DM501A's)... I need to sweet talk my way into a cal lab or
see if I can borrow/rent a Fluke 5700 and spend a weekend calibrating anything
that moves.Most accurate DVMs have a rather long integration time. I think
that masks much of the noise of the Xicor chip. It is certainly good for 4.5
digit meters and gives meaningful/repeatable data on 6.5 digit meters.
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