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measuring frequency change vs. time in an RF cavity

Question asked by ecj on Apr 28, 2011
Hi.  I'm using a E5071C ENA series network analyzer to measure S21 across a resonating RF cavity.  Let's say a resonance occurs in the cavity at a frequency "f0".  I'd like to measure the frequency shift from f0 as a function of time while the fields in the cavity are disturbed by an external influence.  Is there a way to do this without writing a macro?  In other words, is it possible to specify a center frequency for such a resonance, then make many measurements of how the center frequency changes over the course of several seconds, and finally output the results in a plot of delta-f vs. time? 

I've been told that a procedure for this is built in to the analyzer, but so far have been unsuccessful in finding it in the manual.  I thank you in advance for your response.