SU813257A1

SU813257A1 - Potentiometer

Info

Publication number: SU813257A1
Application number: SU772476820A
Authority: SU
Inventors: Анатолий Григорьевич Бульбочка; Владимир Павлович Котельников; Геннадий Владимирович Смирнов; Николай Павлович Мягкоступ
Original assignee: Краснодарский Ордена Трудового Красногознамени Завод Электроизмерительныхприборов
Priority date: 1977-04-12
Filing date: 1977-04-12
Publication date: 1981-03-15

Description

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Изобретение относитс к электроизмерительной технике и может быть п именено дл измерени напр жений и сопротивлений электрических цепей.The invention relates to electrical measuring equipment and may be referred to for measuring voltages and resistances of electrical circuits.

Известны пот.енциометры посто нного тока, содержащие дл повышени точности несколько нeзaвиcи «лx контуров измерени l.DC potentiometers are known which contain, for the sake of accuracy, several abnormalities in the l of measurement circuits l.

Однако такие устройства отличаютс чрезмерной сложностью.However, such devices are extremely complex.

Наиболее близким к предлагаемому техническому решению вл етс потенциометр , содержащий усилитель посто нного тока с источником опорного напр жени , измерительными декадами проводимостей, установленными в цепи обратной св зи, и нагрузочным резистором , к которому подключен нуль-индикатор , св занный с источником входного сигнала з.Closest to the proposed technical solution is a potentiometer containing a DC amplifier with a source of reference voltage, measuring decades of conductances installed in the feedback circuit, and a pull-up resistor to which a null indicator is connected. .

Недостатком такого устройства вл етс ограничение по верхнему пределу измерени .The disadvantage of such a device is the restriction on the upper limit of measurement.

Цель изобретени - расширение верхнего предела измерени .The purpose of the invention is to expand the upper limit of measurement.

Дл дос- ижени этой цели потенциометр , содержащий усилитель посто нного тока с источником опорного напр жени , блоком измерительных декад проводимостей, установленным в цепиTo achieve this goal, a potentiometer containing a DC amplifier with a voltage source, a block of measuring conductivities of decades, is installed in the circuit

обратной св зи, и нагрузочным резистором , к которому подключен нуль-индикатор , св занный с источником входного сигнёша, снабжен переключателем, неподвижные контакты которого соединены с входом усилител и с общей точкой блока измерительных декад, нагрузочного резистора и источника опорного напр жени , а подвижный контакт feedback, and a load resistor, to which a null indicator connected to the input signal source is connected, is equipped with a switch, the fixed contacts of which are connected to the input of the amplifier and to the common point of the block of measuring decades, the load resistor and the reference voltage source, and the movable contact

0 подключен к источнику входного сигнала .0 is connected to the input source.

На чертеже изобргикена принципиальна электрическа схема потенциометра .In the drawing of an isobril, the electric circuit of a potentiometer is of principle.

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Claims

The device contains an amplifier 1, to the input of which a source 2 of the reference voltage is connected, and a load resistor 3 to the output. In the feedback circuit of the amplifier, a block of 4 measuring decades is connected. A zero-indicator 5 is connected to the load amplifier, which is also connected to the input signal source 6, to which the fixed contact 7 of the switch is connected, the moving contacts of which can be connected to the amplifier input B and the terminal 9 connected to the load resistor 3 and measuring unit 4. decade The potentiometer works as follows. When switched on, switch 151 to position 7–9 by selecting the conductivities of the measuring decades 4 according to the indications of the Hyjib indicator 5 to achieve the equality of the voltages {.- and Ua, where E j is the input voltage; U is the voltage across the load resistor 3. The graduation of the measurement decades allows you to judge the value of Ejj. If it is necessary to extend the upper limit of the potentiometer measurement, the switch is shifted to position 7-8. Then, therefore, the measurement limit of E. is increased by the magnitude of the reference voltage E. Formula of the invention which is connected to a null indicator associated with an input source, characterized in that, in order to expand the upper limit of the measurement, it is equipped with a switch, the fixed contacts of which are connected to the amplifier input and the common point of the block of measuring decades, the load resistor and the source of the reference voltage, and the moving contact is connected to the input source. Sources of information taken into account during the examination 1. Description of potentiometers of the type Р-345, Р-367, etc.

2.Ornatsky P.P. Automatic measurements and devices. K., 1971, p. 123 (prototype).