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8510C drift issue on S11

Question asked by bar28 on Oct 14, 2014
Latest reply on Dec 20, 2014 by Dr_joel
Does anyone know, what is acceptable raw drift performance of 8510C (45MHz-26.5GHz)?
I measured short directly to test set testport and i got the following results. I done 8 uncorrected
S11 measurements and normalized raw datas to mean (see pic). S22 drift results are almost the same as S11.
Can S11/S22 drift somehow improve? 8510C and calkit components are all the time on lab enviroment 23 +/- 1celsius  

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