Abstract: A method for measuring electric currents and a method for measuring electrical voltages. The method uses a mathematical model of the measuring system to compensate for error effects of the real system compared to an ideal system, thereby enabling a highly accurate measuring system. An energy meter compensates for the error effects of the real measuring system.

Abstract: A machining device for an element to be machined includes a moving unit, a machining unit and a control element. The moving unit is provided with an acceleration unit. The control element and the acceleration unit are designed so that a movement of at least one part of the acceleration unit with at least one component of movement transverse to the direction of movement of the moving unit is mechanically associated with a movement of the moving unit relative to the control element. The acceleration unit is designed so that producing a relative acceleration of the machining unit in relation to the moving unit in the direction of movement of the moving unit is mechanically associated with the movement of at least said part of the acceleration unit.