Abstract: A measuring circuit used for the capacitive examination of a moving elongated textile test material such as card sliver, roving, yarn or woven fabric, having a measuring capacitor for accommodating the test material, and a component with a capacitance which can be changed by an electric control signal. The measuring circuit can thus be balanced in a simple, rapid, cost-effective and especially automatic way.

Abstract: A measuring circuit used for the capacitive examination of a moving elongated textile test material such as card sliver, roving, yarn or woven fabric, having a measuring capacitor for accommodating the test material, and a component with a capacitance which can be changed by an electric control signal. The measuring circuit can thus be balanced in a simple, rapid, cost-effective and especially automatic way.

Abstract: A measuring circuit used for the capacitive examination of a moving elongated textile test material such as card sliver, roving, yarn or woven fabric, having a measuring capacitor for accommodating the test material, and a component with a capacitance which can be changed by an electric control signal. The measuring circuit can thus be balanced in a simple, rapid, cost-effective and especially automatic way.

Abstract: A measuring circuit used for the capacitive examination of a moving elongated textile test material such as card sliver, roving, yarn or woven fabric, having a measuring capacitor for accommodating the test material, and a component with a capacitance which can be changed by an electric control signal. The measuring circuit can thus be balanced in a simple, rapid, cost-effective and especially automatic way.

Abstract: The invention relates to a method and a device for monitoring a moving fabric web (1), at least a part (7) of the width of the fabric web being detected. In order to maintain the geometrical ratios between the individual elements from which the fabric web is constructed as far as possible in the image of the fabric web also, an image of the fabric web is to be produced on the one hand and on the other hand the movement of the fabric web is to be detected in the same part of the fabric web.

Abstract: The invention relates to a device for measuring properties of a longitudinally moved test material in a measuring cell. In order to provide a device which is easier to adapt to the requirements of a customer and to the special conditions of a production machine for longitudinally moved test material, the measuring cell (1) is connected to a processor (6), which is associated exclusively with the measuring cell.

Abstract: The invention relates to a method and a device for determining proportions of solid matter in a test material. In order to reliably and easily determine proportions of solid matter in a test material, even in the case of transparent matter or matter of a similar color to the test material, the test material is exposed to an electric field and dielectric properties of the field are determined with the test material present. Two electrical quantities are determined from the dielectric properties and combined, resulting in a characteristic value which is independent of the mass of the test material. The characteristic value is compared with a previously determined characteristic value for the matter in question and the proportion of solid matter is determined therefrom.

Abstract: The test sample (G) is illuminated at at least two points (S 1, S2) and the reflection from the test sample (G) and also the diameter of the sample or the change therein are measured by receivers (E1, E2). The measurement signals thus obtained are linked together and the signal resulting from this process is examined for differences from a predetermined value. If a difference is detected, there is an impurity in the test sample (G). For use in combination with an electronic yarn clearer for the detection of foreign fibers in yarns.