The ECal module automatically detects the connection between E5072A's test ports and ECal module's ports. You can turn OFF this function to set ports manually.
Press Channel Next/Channel Prev to select the channel for which you want to turn OFF the auto-detect function.
Press Cal.
Click ECal > Orientation > Manual.
Specify a test port of the E5072A.
Specify an ECal port for the port of the E5072A you specified.
Even if the connection is wrong with the auto-detect function turned OFF, no error is displayed.