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What is "switch term" in error model?

Question asked by kelm on Aug 14, 2008
Latest reply on Oct 5, 2020 by RohanK
Dear experts. I am a little confused about the "switch term" in VNA error correction model.  Only need in three-sampler vector netwok analyzers?
Does those "switch term"  included in calibration coeffient alreadly?
And those "switch term"  only need to be considered in 2-port measurement,right?
About agilent VNA,which one are four-sampler configuartion and which one are three-sampler?