2 ports softkey

Softkey	Function
1-2	Selects test ports 1 and 2.
1-3	Selects test ports 1 and 3.
1-4	Selects test ports 1 and 4.
2-3	Selects test ports 2 and 3.
2-4	Selects test ports 2 and 4.
3-4	Selects test ports 3 and 4.

An asterisk (*) in the upper-right of the softkey indicates that the existing calibration coefficient will be cleared if you select the test port and execute acquisition of the calibration coefficient (clicking Done).