3 ports softkey

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