How to set different power levels on PORT1 and PORT2 using network analyzer 8753ES?

Hi all, i am using network analyzer 8753ES, and i want to set two different power levels on PORT1 and PORT2. Is it possible ? Anyone knows .....?

Go to "sweep setup *" and set "COUPLED CH" to "Off". Then go to "power *" and set "PORT POWER" and "CHAN POWER" to "UNCOUPLED". You should be able to set two different power levels now.
* These are under the stimulus box on the analyzer