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PNA-X Option 090:How to analyze the chance of recording an image signal

Question asked by Macree on Apr 18, 2018
Latest reply on May 7, 2018 by Dr_joel

Hi every one.The spectrum analyzer in VNA is a nice function,but it still has some problem.It has a probability to record image signal.The patent said:With an unknown muilt-tone input RF spectrum,the chance of recording an image signal at any RF frequency for a multi-tone input RF spectrum  of some arbitrary period is approximately (N*RBW/IFBW)^N.But I can't understand this equation and want to learn about how to calculate.Dose it mean that spectrum analyze result shown on the screen is not 100% truth?Thanks a lot.