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8722ET S11 looking into port 2

Question asked by mjc87 on Aug 13, 2019
Latest reply on Aug 13, 2019 by tsilchia001

I have an 8722ET which is showing almost a perfect open circuit after calibration when looking into port 2 (it improves a little with frequency but <5GHz the return loss is <1dB). Using port extensions suggests the open is approx ~100mm inside the instrument. Can anyone confirm that port 2 should be well matched to 50 ohms and suggest what the failure mode might be?