AnsweredAssumed Answered

Phase noise measurements not below -119dBc/Hz

Question asked by AOG on Feb 8, 2015
Latest reply on Feb 11, 2015 by MikeM
Hello all.  I have an E4440A with the Phase Noise personality, Option 226.  I have tried to measure the phase noise on several generators with known phase noise below -126dBc/Hz but the best I can obtain on the E4440A is -119dBc/Hz.  I performed the DANL performance test and it passes with flying colors.  Could there be a problem with the E4440A's LO?  If so, how could I verify it?  Is there anything else I should be looking at?  

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