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Different results with using Smart Cal vs Unguided Cal

Question asked by YP on May 14, 2014
Latest reply on May 21, 2014 by Dr_joel
Hi, we are measuring the S-parameters of 75 ohm CATV amplifiers using a PNA-X. All cables, matching pads, calkits remain the same and we only performed the cal with a different method (via unguided cal and smart guided cal) and got very different results especially on the K factor on our DUT as shown in the attached file. After which, we performed the test with the same setup using a ENA and got another set of different result.

May I know what causes the discrepancies? And how do we verify which is the accurate one?