Tony,
for understanding the 3458A, the HP Journal 4 / 1989 is a good read,
available on the agilent site.
There's described, that the 3458A is calibrated completely by two
sources only, i.e. 10V and 10kOhm, and all other ranges and modes are
derived from its ultra linear A/D transfer.
Each 10:1 range transfer calibration adds about 0.5-1ppm additional
error, which explain partly the discrepancy.
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