Pna can´t read port3 and port4

[pxi_ni_it]

Hello,

I am using LabVIEW 2014 to adquire that from PNA-X N  5242A. 
Until now, I am capable to adquire data from PNA-X in port 1 and in port 2.
To read data from port 3 and port 4 I had to change a driver (see image1.png).
After this change I can read data from port 3 and port 4, but the data is always the same, never change. So, The code to read port 1 and port 2 are equal for read por 3 and port 4, why don't work for port 3 and port 4?
Someone can help please?

Best Regards,

Marina Jordao

[CRoebuck]

Hi there,

Have you performed a full 4-port calibration on the PNA before trying to perform the measurement ?

Regards,
Chris

[pxi_ni_it]

Yes, I do a 4-port calibration before start measuring my setup.
As can be seen in capture.png, the port 3 and port 4 as the same capture, and It is not the behaviour that I see in a3, b3, a4 and b4 in PNA-X.

[pxi_ni_it]

I hope to see this