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problem in Noise figure measurement on PNAX

Question asked by sfoong on Oct 2, 2013
Latest reply on Oct 2, 2013 by sfoong
Dear Sir,

I came across a weird case in measuring NF on PNAX.

I want to measure NF today, I found that the NF from 6GHz to 12GHz is abnormal.
So, I connected a THRU without any CALIBRATION done, I observed that the NF suddenly shoots up to 9dB at 6GHz all the way to 12GHz then coming down.

Attached is the screen capture.

Do you have any idea on this?

Thanks.  

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