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478A-H76 drift and possible error on E4418B service guide

Question asked by bar28 on May 5, 2011
Does anyone know, how big would be 478A-H76 mount's average sensor drift value?
I found from E4418B power meter service guide, that 8478B drift is < 0.06% per year.
Would it be more a less same level?

and one more thing. Does E4418B service manual has an error what comes for
uncertainty budget table? When you looking those Ci values, it seems that calculated
sensitivity values are copy/pasted directly to budget table, which causing error.
Vo, V1 and Vcomp order is the not the same on uncertainty table than on sensitivity calculations.

See the pic  

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