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An extra sweep while calibrating

Question asked by alfa on Jun 22, 2009
Latest reply on Jun 25, 2009 by alfa
I am using the E8364A PNA with TRL calibration.
While performing the calibration with the Line standard connected, the PNA did 3 sets of sweeps (forward and reverse).
I imagine that one set is for measuring the Line's raw S parameters, another set is for the switch errors removal.
So, what is the purpose of the third sweep set?