A method and circuit arrangement for the determination of an electric measured value for a resistance element, preferably for the determination of an electrical current through the resistor element.

摘要

The present invention relates to a method and a circuit arrangement for the determination of an electric measured value for a resistance element (r22), preferably for the determination of an electrical current through the resistor element (r22), wherein the resistance element to be measured (r22) together with further resistance elements within a resistance matrix (2), consisting of columns (cl1, cl2, cl3) and rows (r1, r2, r3) of resistance elements, is interconnected. First of all, in this case a measuring voltage (meas) with a base load resistor element (r13) loaded, the between the output of a mess - / supply unit (1) and the common ground connection of the resistance matrix (2) is connected. At the same time, the measurement voltage (meas) with the input terminal of an impedance converter (ocl, or), whose output only in a next step, using the not for the measurement resistance elements of the present resistance matrix (2) is connected. As a result, a voltage difference at the input of the operational amplifier is avoided, as a result of which undesired fluctuations largely do not occur, which could falsify the measurement result.