a pim measurement circuit enables making forward and reverse pim measurements on any 1 port or 2 port device with the ability to determine in distance where individual pim impairments are located as well as their magnitude . the pim measurement circuit includes two frequency sources that are provided through a combiner for a cw characterization of the pim circuit . to enable distance determination , an fm measurement is created by using a saw tooth offset sweep generator attached to one of the two frequency sources . with downconversion and processing of signals from the pim impairments , the fm signal provides a frequency variation that is converted using a fourier transform or spectrum analysis for separation of frequencies , enabling determination of the distance of the pim sources as well as their magnitudes .