[Elecraft] S meter calibration?

[K7WIA]

when calibrating the S meter, the manual says to have the pre-amp on, SMTR MD
to Relative (NOR) 
I find that I can't even get close.
with the pre-amp off it fall right into spec. as per the manual, with the
SMTR MD set to Nor
I am using the XG2, and receiving on 20 mtrs. 
with SMTR MD set to Abs and with the pre-amp on it falls right into spec..
am I missing something ? or is the manual in error..

Ed  K7WIA  #2225
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