The E5063A-006 option is necessary if the network analyzer E5063A has to measure the transmitted power (wireless power transfer / WPT) between coils or resonators in real time with arbitrarily variable impedances. A 2D / 3D analysis of the measurement data helps the user to better estimate and understand the dependence on load impedances. The configurable test system E5063A allows high-performance measurements with external power amplifiers to be carried out on the modules to be tested under real operating conditions. For more precise measurements, temperature drifts on the part of the power amplifiers are compensated for by access to the internal sources and receivers. The network analyzer data can be used for further component modeling and simulation in the Keysight ADS simulator.