Abstract: A method of operating an induction distance sensor employs a sensor having a vane or tongue of magnetic material disposed movably between two inductive coils for changing their inductances in the opposite sense upon movement of the tongue. With respect to sensor signals U.sub.s and U.sub.e, the method employs the portion U.sub.sL of U.sub.s which is in phase with the imaginary part U.sub.eL of U.sub.e. Furthermore, the value U.sub.sL measured in this way is to be further increased by U.sub.e /U.sub.eL in order to compensate for the temperature influences on the ohmic resistances. Furthermore, the errors which can be caused by erroneous controls U.sub.e1 and U.sub.e2 are also corrected. For this purpose, the total voltage is applied at intervals to a reference sensor which consists of a precision resistance divider. In this way, the exact middle point M of the total voltage U.sub.e =U.sub.e1 and U.sub.e2 can be determined by measurement, and the middle-point voltage U.sub.

Abstract: For the calibration of an electronic measurement system with sensors which are arranged in pairs on structural parts of an airplane undercarriage which are loaded transverse to the lengthwise direction and which give off measurement signals which correspond to the vertical displacement between two sensor attachment points which are staggered from each other in the lengthwise direction of the structural parts, the pair of sensors which form a measurement point in each case being arranged approximately in the horizontal central plane of the structural part at positions opposite each other on the outside, a method is proposed in which a separate scaling factor is determined for each sensor of the pair of sensors. For this purpose, the measurement signals and weights are preferably determined for at least two conditions of loading of the airplane which are as far apart as possible and, furthermore, in connection with at least two different torsional conditions of the loaded structural part.