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: Disclosure is made of a switching device on the basis of an active switching element. The device is built around an operational amplifier whose negative feedback circuit incluses serially connected key elements. Control inputs of the key elements are connected to a control bus. Interposed between an inverting input and an output of the operational amplifier is a key element whose control input is connected to the control bus via a single-shot multivibrator and a delay line placed in series therewith.

Abstract: A switching device, comprising two identical active switching components connected in series and made as an operational amplifier with keying elements in the negative feedback circuit and two identical operational amplifier null bias voltage memory circuits, the inputs of each of said circuits being connected to the outputs of the operational amplifiers and the outputs, to the non-inverting inputs of the operational amplifiers so that the output of the first memory circuit is connected to the non-inverting input of the operational amplifier to whose output is connected the second memory circuit and the output of the second memory circuit is connected to the non-inverting input of the operational amplifier to whose output is connected the first memory circuit.

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.