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Why do I MUST define SOLT Class Assignment in TRL Calibration

Question asked by mirza on Feb 26, 2013
Latest reply on Feb 26, 2013 by mirza
I am using Agilent E8364B PNA. I have defined my TRL calibration standards. I have read all the related application notes. According to these notes, in TRL calibration, I just have to define my THRU, REFLECT and LINE standards.

But when I select my custom CalKit and press next to start calibration; the PNA shows and error and won't let me do the calibration unless I also define SOLT class assignments:

S11A       (Open)        S22A         FWD TRANS
S11B       (Short)        S22B         ISOLATION
S11C       (Loads)       S22C

Does any one have any idea?