Patent ID: 7235982

Claim:
A method of calibrating a test system comprising: performing at least one two-port S-parameter calibration between a first port and a second port of a test system having a multi-port vector network analyzer to provide a first two-port S-parameter calibration of the test system; connecting a transfer device between the first port and the second port; changing the first port to provide a second state of the test system; measuring a plurality of ratioed un-corrected parameters of the transfer device with the test system in the second state; using the plurality of ratioed un-corrected parameters of the transfer device in combination with the first two-port S-parameter calibration of the test system to determine a second two-port S-parameter calibration of the test system in the second state; and using the second two-port S-parameter calibration of the test system in the second state to make a calibrated measurement of a device under test.