The disclosure relates to a converter control unit or power system stabilizing unit for counteracting oscillations in electric power systems that is equipped and employed to provide and processes information for system-wide monitoring, protection, control and metering. A transducer can be associated with the tubular member to provide a signal in response to the flow of fluid through the tubular member. The system, software and method disclosed facilitate forensic analysis and techniques providing corrective re-design efforts to improve the service rather than short-term problem solving of reported service issues. The effective capacitance CIN presented to the capacitor multiplier’s terminals is on the order of k times the value C of the reference capacitor. An outer layer formed of a filler material is arranged at least on the wavy surface of the ferrous material ring. Another object is to provide a manufacturing method of a semiconductor device which can be manufactured with high mass productivity.