How Accurate Are Your RF Measurements? Accurate power measurements on RF signals require a thorough knowledge of the varying nature of the signals under test. We have obtained very good results with this system, improving the uncertainty of a 100W, 1GHz flow calorimeter to 0.43% of full scale. Using this system, through-line wattmeters can be calibrated automatically with an uncertainty of 0.55%.

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AN221: Coaxial Flow Calorimeter