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calibration results of CHD

Question asked by coral114379403 on May 6, 2011
Latest reply on May 12, 2011 by Dr_joel
hi,
i have a automation test station for ethernet spec(1000Mb/s), in the test,there is an important measurement parament——return loss.
in order to get accurate results, the calibration of VNA should be done successfulyl, and in my calibration, ch A/B/C are all OK, ie, verified with 50om load, the RL is around 9.54dB.
but for the ch D, the RL is very unstable,it will change intensely.
i have checked my cable and it's OK.
so i now do not know how to fix it, can anyone help me?
thanks very much!  

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