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Calibration of one attenuator and the VNA uncertainties

Question asked by maferra on Oct 30, 2007
Latest reply on Oct 31, 2007 by daveb
I hope you can help me.

I have searched the Agilent forums and didn't find an answer or a hint to my problem.  I'm trying to calibrated a fixed 20dB attenuador (type-N) in a VNA, and after I do the VNA 2-port calibration using a TOSM calibration kit, there remains some uncertainty on the value given by the VNA on the S21 Log. magnitude.  Can any of you point me the source of the uncertainties and how they can be quantified (probabilistic distribution, etc.) ?  Are all the uncertainties given in the datasheet of the VNA?

Sincere regards, and thank you in advance,