Radio interference voltages that are generated by electrical consumers and reach the mains via the power cord can be verified with the help of network simulations and spectrum analyzers / measurement receivers. The lines going out from the consumer (source of interference) are terminated against each other and against their reference ground with defined afterimage resistances. With the network simulations from Schwarzbeck, the test objects (classic 230 V, but also special voltages such as for automotive applications) can be supplied with the operating voltage.