Method for operating capacitive measurement circuit

The invention provides a method for operating a capacitive measurement circuit (1). The circuit (1) can be used for the capacitive analysis of a moving elongated textile test material, such as a card sliver, roving, yarn or woven fabric. It comprises a precision capacitor (2) for receiving the test material. It further includes a component (3) having a capacitance that can be varied by way of an electric control signal (71). In this way, the measuring circuit (1) can be aligned easily, quickly, cost-effectively and in particular automatically. A variable capacitor is used for feeding random electrical control signals to the measurement circuit. The measurement circuit (1) has the functions of recording and playback, a capacitor to be measured in the method is not changed temporarily, and the electric control signal is no relavant to the output signal of the measurement circuit.