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Measuring very high isolation

Question asked by HighPowerNev on May 14, 2007
Latest reply on May 14, 2007 by Dr_joel
I have been asked to measure isolation to >100 dB and >140 dB on a microwave switch below 10 GHz.
Looking at the specs for our HP8720ES it has a dynamic range of 100 dB so I could probably measure 90 dB sensibly.
Does anyone know a method to measure such high isolations ?