ANORDNING FOER OMVANDLING AV EN ICKE- ELEKTRISK STORHET TILL EN ELEKTRISK SIGNAL.

摘要

The invention concerns measurement technology, especially an arrangement for converting a nonelectrical quantity to an electrical signal. The arrangement includes a measurement bridge circuit 1 and a compensation bridge circuit 2, whose measurement diagonal branches are connected to an electric current source 3. A nonelectrical quantity, for example, deformation, force, pressure is made to act on an input in measurement bridge circuit 1, whose output is connected to an input of a measur0ement converter 4. The effect of so-called destabilizing factors, like temperature, electromagnetic fields, aging with time of the components in the device is reduced by providing the arrangement with a compensation bridge circuit 2 whose output is connected to an input of a correction converter 6. The measurement bridge circuit 1 is represented by the arms of a compensation bridge circuit 2, in which the correction converter 6 is provided with differential output, which are connected to controllable dividers 7, 8, 9, 10 whose number correspond to the number of introduced so-called compensation connections (compensation relationships). The outputs of dividers 7, 8, 9, 10 are connected to a curve displacement unit 5 and a scale adjustment circuit for the functional curves of the device. The device also includes a controllable bridge circuit 11 to compensate for nonlinearities in the functional curve of the device and a unit to change the mutual conductance of the function curve. The invention can be used in devices for automatic control of processing operations.