You can configure the E5061B by using various commands. Some commands require you to specify and work with a particular channel or trace, while other commands do not have this restriction.
Those commands that do not require you to specify a particular channel or trace apply to the currently active channels and traces. Before issuing such a command, therefore, you must make the appropriate channels and traces active.
To make a channel active, use the following command:
:DISP:WIND{1-4}:ACT
Only the currently displayed channels can be active channels. Therefore, you must display the desired channels by using the :DISP:SPL command before making them active.
To make a trace active, use the following command:
:CALC{1-4}:PAR{1-4}:SEL
Only the currently displayed traces can be active traces. Therefore, you must display the desired traces by using the :CALC{1-4}:PAR:COUN command before making them active.