Patent ID: 7271575

Claim:
A method of determining a characteristic parameter of a device under test (DUT), comprising: determining, using a test signal having spectral components associated with each of a plurality of frequencies of interest, and for each of a short circuit, open circuit and balanced load condition, a reflection coefficient magnitude and phase of a testing system output port; calculating error correction terms adapted to substantially compensate for the determined reflection coefficient magnitude and phase of the testing system output port under the load conditions; causing the application of said test signal to a device under test (DUT) operatively coupled to said output port; measuring a response of said DUT to said test signal; and correcting said measured response of said DUT using said calculated error correction terms to produce a corrected measurement result that represents said characteristic parameter of said DUT in the form of a return loss parameter calculated using an equation of the following form: Return ⁢ ⁢ loss = - 20 ⁢ ⁢ log ⁢ Γ ⁢ ⁢ m - b a - c . Γ ⁢ ⁢ m .