Method for producing an apparatus for measuring the strength of an electrical current by means of a resistor arrangement, wherein the method comprises the following steps: a) providing a resistor arrangement comprising at least two connection elements (3, 3') and at least one resistance element which is arranged with respect to the direction of the electrical current between the connection elements (3, 3'), wherein the at least one resistance element on the one hand and the connection elements (3, 3') on the other hand comprise different electrically conductive materials, b) forming at least one contact element from the material of at least one connection element (3, 3') or from the material of the resistance element so that the contact element is monolithically connected to the connection element (3, 3') or to the resistance element, wherein the contact element has a longitudinal axis by means of which an axial direction and a radial direction which is perpendicular thereto are defined, and wherein the contact element is formed in such a manner that it has an end face which faces away from the resistor arrangement and a hollow space which is open at the end face of the contact element facing away from the resistor arrangement, c) providing a printed circuit board which has at least one through-hole having an inner surface on which electrically conductive material is located, d) positioning the printed circuit board on the resistor arrangement in such a manner that the printed circuit board has an upper side which faces away from the resistor arrangement and the at least one contact element protrudes at least into the through-hole, e) expanding the contact element in a radial direction by means of an expansion means which is introduced in an axial direction into the hollow space of the contact element as far as the region of the through-hole of the printed circuit board so that an electrically conductive connection between the contact element and the electrically conductive material is produced on the inner surface of the through-hole. a) providing a resistor arrangement comprising at least two connection elements (3, 3') and at least one resistance element which is arranged with respect to the direction of the electrical current between the connection elements (3, 3'), wherein the at least one resistance element on the one hand and the connection elements (3, 3') on the other hand comprise different electrically conductive materials, b) forming at least one contact element from the material of at least one connection element (3, 3') or from the material of the resistance element so that the contact element is monolithically connected to the connection element (3, 3') or to the resistance element, wherein the contact element has a longitudinal axis by means of which an axial direction and a radial direction which is perpendicular thereto are defined, and wherein the contact element is formed in such a manner that it has an end face which faces away from the resistor arrangement and a hollow space which is open at the end face of the contact element facing away from the resistor arrangement, c) providing a printed circuit board which has at least one through-hole having an inner surface on which electrically conductive material is located, d) positioning the printed circuit board on the resistor arrangement in such a manner that the printed circuit board has an upper side which faces away from the resistor arrangement and the at least one contact element protrudes at least into the through-hole, e) expanding the contact element in a radial direction by means of an expansion means which is introduced in an axial direction into the hollow space of the contact element as far as the region of the through-hole of the printed circuit board so that an electrically conductive connection between the contact element and the electrically conductive material is produced on the inner surface of the through-hole.