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Two tier TRl calibration for four samplers VNA

Question asked by mahdi_bme on Nov 30, 2010
Latest reply on Dec 3, 2010 by mahdi_bme

I would like to do Two tier TRl calibration  for four samplers VNA my self .I saw a paper from B.Marks (Two -tier TRL for calibration of Low -cost Network analyzer)
that mention  most four samplers VNAs allows for sampling of the fourth channel under special conditions. This allows for the direct measurement of the load reflection coefficients (switching terms). I would like to ask you How can I measure this switching term .