AD5791 & number of power line cycles ( NPLC )

Hello, 

I have some question about AD5791's linearity analysis.

User guide ( UG-1152 ) have shows us that INL graphic is measured by NPLC = 10, step size = 1024 . 

However Evaluation Board User Guide ( UG-185 ) said that NPLC = 1, step size = 1024 but measurement takes ~ 75 sec.

I tried some experiment about different NPLC of 34410A, and PLC = 10 can get better DNL graphic than PLC = 1.

Does the PLC affect performance significantly ?

BR

Ian

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