[volt-nuts] 3458A calibration

Predrag Dukic stijena at tapko.de
Mon Aug 10 15:39:54 UTC 2009


Hi all volt-nuts,

A quote from previous mails about 3458a calibration:

"What makes it all practical is its near perfect linearity and high 
resolution".

Does anyone know how it is achieved?  I read all that's available to 
me and my main question is:

How to maintain this "perfect linearity".  I read about multislope 
ramp conversion, but that is a solution meant to shorten the

integration for such a big number of digits, not to improve linearity.

All sorts of effects come to my mind...: nonlinear active component 
leakage, voltage coeficients in resistors (also resistive dividers),

nonlinear dielectric absorption in integration capacitors etc etc...

Does anyone has some 3458a AD schematics?  Service manual can't be 
downloaded from internet...



Predrag Dukic




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