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8720ES S22 abnormal

Question asked by broadteq on Jun 3, 2011
Latest reply on Jun 6, 2011 by broadteq
I have a 8720ES VNA,S22 works abnormally when I use full 2-ports,that means when I connet port1 to port2 using a 85131 cable and test S22,there will be some noise signal at high band if IF BANDWIDTH is below 3kHz,while S11 works normally. If I use S22 separately and connect a LOAD to it,It also works normally.the attachment is 3 pictures of S11 S22 and      S22 with LOAD(IF BANDWIDTH 1kHz),May I ask some advice? thanks in advance.  

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