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Purpose of 10 Mhz Ref-Signal?

Question asked by Headnut on Feb 13, 2012
Latest reply on Feb 8, 2018 by mahfuza

Iam using the N9010A-EXA-Analyzer with the 89600 VSA Software to analyze digital modulation (I/Q). Its Inputsignal (RF) is generated by the Agilent N9310A RF Signal Generator, which gets an external I/Q-Signal. Everthing is working fine without using the 10 Mhz Ref-Signal. When i use the Ref Signal by connecting the Ref-Output of one instrument with the Ref-Input of the other instrument, i dont recognize any differences. So, what is the advantage of the Ref Signal?