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The system performance of electrostatic precipitator systems depends heavily on the type and properties of the high voltage power supply. Switched mode type power supplies like IGBT inverters have been proven very beneficial for that purpose during the last decade in many applications. It has even been possible to increase the electrical power significantly, in many applications a factor of 2 can be achieved, which leads to a significant improvement of the dust collection performance. Additionally, the energy efficiency of the precipitation process becomes more important. With the switched mode power supply technology both, collection, and energy efficiency can be improved. Unfortunately, it is very difficult and unreliable to estimate the potential of improvement in advance of the equipment modernization. There are a high number of relevant process variables and uncertainties which cause the theoretical results to being unreliable. Therefore, the practical and reliable determination of the possible improvements requires a trial installation of the entire high voltage power supply equipment on site and accurate analysis of the measured data. The proposed solution suggests a mobile self contained trial unit, which can be connected easily to any existing electrostatic precipitator installations to run the tests and prove efficiencies in a real environment.