CURRENT STABILIZING UNIT IN MEASURING CONVERTERS

The invention relates to a circuit arrangement for stabilising currents and amplifying voltages in measurement converters used in metrology and automation technology. Using this circuit arrangement, all electrical sensor output signals - currents, voltages, resistances - can be converted and amplified into a common electrical signal. The aim of the invention is to achieve an improvement in the technical parameters while at the same time reducing the use of components, and to reduce markedly the production effort. The present invention is based on the object of making it possible to construct a miniaturised measurement converter, achieving a higher reliability, additionally minimising heating which is dependent on the drive level, and of supplying the 4 mA basic current into the measurement circuit without current losses. The essence of the invention is that a double power source having a common base point supplies a balanced circuit consisting of two transistors, one of the transistors having a base-collector short and the emitter of the said transistors supplying a second balanced circuit consisting of two further transistors, and on the opposite side of the one transistor, the other transistor having a base-connector short, and the two emitters of the other two transistors being connected to a measurement-range circuit. An output stage supplies into this measurement-range circuit a ... Original abstract incomplete.