in one embodiment , a method of operating a network analyzer , comprises applying a stimulus signal on at least one port of the network analyzer for provision to a device under test within a test fixture coupled to the network analyzer ; generating measurement data from the dut in response to the stimulus signal on at least one port of the network analyzer ; and generating an amplitude response of the dut across a frequency range , wherein a port extension module of the network analyzer automatically applies loss compensation to the amplitude response in a manner that is non - linearly related to frequency according to at least one controllable parameter .