def METHOD_NAME():
    # Test second level channel (port in channel)
    with expected_protocol(
        AnritsuMS464xB,
        [(":SOUR6:POW:PORT1 12", None),
         (":SOUR2:POW:PORT4?", "-1.5E1")],
    ) as instr:
        instr.ch_6.pt_1.power_level = 12.
        assert instr.ch_2.pt_4.power_level == -15.