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PNA-X N5244A - Unexpected Return Loss step response after preset

Question asked by mirek on Apr 10, 2015
Latest reply on Apr 20, 2015 by jvall
I am getting add Return Loss when I preset my PNA-X N5244A.
The trace instead showing more or less flat sweep showing step response. I look like the factory cal data have fix amplitude offset at some frequencies. Each port showing little different pastern of that steps (see the plots).
The Network have male 2.4 connectors so I attach Maury F 2.4 to F 2.92 adapters on  all ports (the attach adapters are not the cause of the add response).
What is the cause of that? Does this can have impact on calibration and measurement quality? How to fix that?