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Hello,there is only one way out of the dilemma:- more references or- more DMMsor both by the way: a LM399 reference needs no precision resistors to deliver stable 7V output.with best regardsAndreas
By the way...How can you achieve the noise spec of a HP3458A in the 10 Volt Range ( 0,01 ppm RMS ) if your LTZ inside the HP3458A has a noise of 1.0 - 1.6 uV?Or am i doing wrong calculations here?