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ECAL Calibration check

Question asked by henryd on May 23, 2018
Latest reply on Jun 7, 2018 by Dr_joel

This question is about how to verify if the VNA calibration is well done. I got information from Keysight engineer before, we can use the ECAL Confidence Check for calibration verification. The current curve should be exact overlapped with the memory curve. However when I set the scale to 2dB, they looks not exact overlapped. See the following screenshot. If the difference can be accepted? What is the criterion?