10 this is achieved by the selective application of an insulative rubber coating in this manner a shielded system comparable to a coaxial system is formed which due to the protective action of the foil 11 is largely protected from electrical interference the measured signal is conducted outwards between the top surface of the support plate 10 and the foil 11 the inertial mass 7 is thus supported on the magnet core 4 via the piezoelectric plate 9 referring now to the position of the sensor 1 shown in fig1 the sensor is fastened vertically at the wheel suspension or alternatively near the wheel to the body of an automotive vehicle to this end the sensor housing 3 is rigidly connected with the component whose vertical acceleration is to be measured due to the vibrations or vertical acceleration of the vehicle body the inertial mass 7 is vertically displaced relative to the housing 3 and the vehicle body and is caused to oscillate since the mass 7 is elastically embedded in the rubber block 8 this inertial mass 7 is also biased downwardly and via the piezoelectric plate 9 and the plate 10 is resiliently pressed against the abutment formed.