When performing PNA ECal guided calibration on multiple ports, the PNA will prompt for thru connections for any ports that are not connected to the same ECal module. From experience, it looks like ports 2,3 and 4 needs to be connected to port 1. What if port 1 is not included in the calibration? Is there an algorithm for determining which PNA port that will act as "common port" for thru measurements?
The explanation in the help file "How can we measure only 3 THRU connections?" does not cover this topic.