Circuit arrangement for stabilising currents in measuring transducers

摘要

It is the aim of the invention to avoid the disadvantages of the known embodiments and, overall, to provide for inexpensive production with a lower number of components. It is the object of the invention to achieve a circuit arrangement for stabilising currents in measuring transducers, in which the basic current is to be derived from the measuring bridge current, which is more stable by a multiple, and, at the same time, the bipolar supply voltage for operational amplifiers is generated without problems. The essence of the invention consists in that a dual current source is used in current balancing technique for 4mA basic current stabilisation, which feeds, from one part- current, a measuring range circuit and a generator circuit and, from another part-current, a reference element which is connected in parallel with a centre voltage generator, the centre voltage generated being used as reference potential for the measuring range circuit. The present invention can be used in measuring transducers, preferably in two-conductor technique, with current-fed measuring bridges. <IMAGE>