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Tranmission and Reflection Uncertainty

Question asked by stanleymyc Employee on May 3, 2009
Latest reply on May 4, 2009 by Dr_joel
Hi all,

good day to you. Hopefully there is someone able to help me on the enquiry:

On the E5071B/E5071C ( i assume the specs are the same as PNA), for the tranmission and reflection uncertainty specs, i find out they have put S11=S22=0 for tranmission uncertainty, and S21=S12 =0 for reflection uncertainty.

After downloading the VNA uncertainty calculator , then at the "Set Chart Parameter" , i find out the setting for S11 and S22 for tranmission (S21) is 0 too, and S21 and S12 is 0 for Reflection (S11),

i wonder is there any reason we have 0 for respective S11 and S22 measurement? and also, in the uncertainy calculator, if i change the to 0.5 or 1 maximum, what will be the impact on the unit?

and finally, did the uncertainty calculator provide me the uncertainty specs after connecting the DUT with network analyzer, or before connecting the DUT?

thanks if anyone can provide the clarification.

Have a nice day.