A process for printing images by means of an electrographic or electrostatic device using a toner that is cured by multiple applications of energy. For this purpose, a panel is provided which has a coplanar overall upper side of an upper side of a plastic compound and the upper sides of semiconductor chips. The parameters of the polynomial are determined by a quantity of measurements which correspond to the order of the polynomial, under operating conditions which are known to differ, and the specific resistance value or a value derived from it are compared with a specified value. The invention can be applied to both single stage and dual mixers to give low noise performance and Automatic Gain Control. The switching element outputs the potential of the capacitor.