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Linearity of the power sensor

Question asked by pera on Nov 22, 2014
How can I measure and calculate the nonlinearity of the power sensor in dB and [%] ?

I read Agilent/Keysight`s AN and the articles "Attenuation Measurements", Alan Coster, "Aspects of Calibration Power Splitters and Detector linearity", Alan Coster,
"Measuring RF Power Sensor Nonlinearity", TEGAM, AN 220, 
but I do not understand equation for calculating nonlinearity. 
i.e. I can not replicate the results of these articles.
Agilent/Keysight expressed linearity of sensors  in % but does not give a equation and Measurements methods.

Can You help me?