Abstract: A beam machining head (10; 100; 200) for beam cutting of a workpiece is provided, having an interface (12) for an energy beam source (14; 14, 201) for generating a focused machining energy beam (15; 206) selected from a particle beam source, a fuel fluid beam source, a plasma beam source and/or a source for electromagnetic radiation; an exit opening (16) for the machining energy beam bounded by an opening edge (18); an optical detector unit (19) for recording at least one image of an electromagnetic radiation (17) emitted from the workpiece (11) through the exit opening into the beam machining head (10; 100; 200) and induced in the workpiece by the machining energy beam; and a monitoring unit (30) connected in a data-transmitting manner to the optical detector unit for monitoring a positional relationship between a centre of the emitted electromagnetic radiation and the exit opening, wherein the monitoring unit (30) has: a first determination module for determining at least one position (180; 182) of the exit

Abstract: A method for adjusting a transmission characteristic of an electronic circuit, in a hearing aid. The hearing aid is connected with a computer. The current operating parameters of the hearing aid are transmitted to the computer. The computer from the operating parameters, calculates the current transmission characteristic and represents it on a monitor screen as a three-dimensional graphic diagram. The acoustics specialist, with the help of a mouse, selects a point of a segment of the graphic diagram and modifies the graphically depicted transmission characteristic. As a result the current operating parameters are modified as well. From these, a new current transmission characteristic is calculated and represented on the monitor screen as a three-dimensional graphic. This adaptation process is repeated until the current transmission characteristic coincides with the desired response. Then the current operating parameters are transmitted from the computer to the hearing aid and there stored in memory.