Vector network analyzer (VNA) calibrations have historically been very labor intensive. That story has changed with the release of Agilent’s new series of Electronic Calibration Modules (ECal). ECal modules offer calibrations at a fraction of the time it would take to calibrate using mechanical calibrations, and are not just limited to quick accurate calibrations. A new “User Characterization” capability empowers users to characterize the ECal mod- ule themselves. Mixed connector, waveguide, and fixture calibrations can all be handled using this feature along with the techniques described in this paper.