I'm using an N5225A. My problem is how to turn off the sweeping of unused ports that are in my calset but not part of my setup. I can turn off output, but the PNA still sweeps those ports sequentially. I do 3 and 4 port calibrations for my test scenarios. When I setup, say an S12 sweep and use a calset for S1, S2 and S4, the PNA sweeps all 3 ports resulting in S2 outputing RF only 33% of the time. My UUT is expecting a constant input.