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E4440A Noise figure calibration

Question asked by rfmagus on Dec 12, 2017
Latest reply on Dec 15, 2017 by bchen94

Hello there,

I am using E4440A spectrum analyzer to do noise figure measurement. I followed the calibration steps given in "Noise Figure Measurement Personality Guide", but the noise figure was not around 0 dB after calibration, and it was changing radically. So, what might be the problem? by the way, I used a agilent 346C noise source in the calibration. Thanks