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E5071C Calibration Issue

Question asked by gk on Apr 17, 2012
Latest reply on Apr 23, 2012 by gk
Hi so I have a e5071c network analyzer and have an ecal module kit.  I have many saved states and use the ecal for them.  However it seems now that if I change states and/or cables the calibration becomes bad and I see way to many ripples on the s11 curve(mainly use above 5GHz) therefore having to do the cal again.  Is this common or is the ecal module bad or vna need to be calibrated?