Normalised measuring device based on a Wheatstone bridge

摘要

The elements of this bridge circuit are wholly or partially active measurement value pickups and are suitable for experimental or industrial examinations of materials under the action of both static and dynamic forces in the fields of machine and plant construction, in building and in electrical measuring technology. The purpose of the invention is that a normalised electric measuring device based on a Wheatstone bridge to be used for measuring rapidly varying signals and to largely compensate for interference variables such as cable and switch impedances and instabilities in the bridge feed voltage. The object of creating a normalised measuring device is achieved by supplying a feed voltage to two input points of a Wheatstone bridge and determining its instantaneous value by a measuring device in the immediate vicinity of the bridge. The imbalance of the bridge can be measured as voltage value across the other two output points. This voltage value is determined by a measuring device and divided by the instantaneous value of the bridge feed voltage in a dividing network.