Abstract: A strain gauge comprises a tensoresistor sensitive element (1), a mechanical compensating element (10) and a spacer element (9) made of a material whose linear thermal expansion coefficient is substantially lower than the thermal expansion coefficient of the material of the mechanical element (10). The latter carries a heater element (15) and a thermoresistor element (16) intended for programmed straining of the mechanical element (10) in the course of the adjustment and calibration of the gauge. An electric circuit for adjusting and calibrating a strain gauge is a bridge circuit inserted into each of the two adjacent arms of which is a tensoresistor (3,4) of the sensitive element (1). Connected to a vertex (32) of a half-bridge circuit is the heater element (15), whereas to the other vertex (37) thereof is the thermoresistor element (16).

Abstract: A multipoint measuring device is based on a measuring bridge network and uses transducers which convert the quantity under measurement into an electrical signal, the transducers being divided into two identical groups, and being connected via a selector switch and main and auxiliary compensators in one or two adjacent arms of the measuring bridge network. With the transducers connected in two adjacent arms of the measuring bridge network, each transducer group is connected only in a single arm via its respective main compensator and its respective auxiliary compensator and the connection point of two auxiliary compensators is used as a measurement point of a measuring diagonal of the measuring bridge network.

Abstract: A multipoint measuring device comprising a matrix of transducers of the measured quantity and switching elements, the columns of said matrix being formed by serially connected switching elements and each transducer having one of its terminals connected to a respective switching element of the column and the other terminal connected to a common bus of a respective row. At the beginning and at the end of each row there are provided switching elements. The matrix is connected to a measuring circuit via two compensators.

Abstract: According to the invention, each digit of the controlled multidigit resistance box comprises "n" series-connected resistors, an operational amplifier and two switching elements connected to each lead of each resistor. One of the switching elements is connected to the inverting input of the operational amplifier, while the other is connected to the output of the operational amplifier. The resistance box further includes a control unit for selecting a desired combination of resistors, connected to the switching elements of each digit. The center tap of power sources of the operational amplifier of the previous digit is connected to the input of the next digit of the resistance box.