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E4418B/E4419B 1mW/50MHz uncertainty calculation

Question asked by bar28 on May 7, 2013
Agilent E4418B/E4419B service manual has an chapter where has explained how to
make uncertainty analysis for 1mW/50MHz reference output. When i'm looking
uncertainty budget table, there has used Divisor 2 with Normal distribution. Why so?!!
I think , that it should be 1 because specs values from 3458A DMM
are without k=2.   (see Appendix C and page C-12)