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How does the 89600 VSA work?

Question asked by pddesigner on May 19, 2014
Latest reply on May 20, 2014 by tabbott
I'm trying to understand if the eye-diagram reported by the instrument is real - indicating the circuit has an issue, or if it might be measurement related.

If the signal is 

f1, f1, f1, f2, f2, f2...

that is, instantaneously changes frequency from f1 to f2 (and similarly on the opposite transition (this is BFSK)), what eye-diagram can one expect?

Any ideas about how it actually work? What sampling rate is used, etc?

Thanks for looking!