This article discusses about Potentiometers, construction, working, its applications and also different types which include rotary and linear Potentiometer. Free Ebooks dc crompton potentiometer theory for download in PDF, MOBI, EPUB, HTML for Amazon Kindle and other Ebooks Readers. Potentiometers. Introduction. A Basic dc Potentiometer. Crompton’s dc Potentiometers. Applications of dc Potentiometers. AC Potentiometers.

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Final adjustments are made for zero deflection with the help of the rheostat. Get best deals for coconut. The basic working principle of potentiometer is quite simple. Supposing the value of emf of the standard cell is 1.

A drop of 1. By adjusting this sliding end, a point like B is found where there is no current through the galvanometer, hence no deflection in the galvanometer.

Amarnath Reddy I am a graduate in electrical engineering and blogger by passion. This textbook ” Electrical and Electronics Measurements by S. In order to operate the galvanometer at its maximum sensitivity provision is made to short the protective resistance when near the balance conditions. The value of unknown emf is read off directly from the settings of the dial adjust slide wire. This does not mean, unfortunately, that small voltages can be read potehtiometer assurance to 0.

Related pages What potemtiometer Potentiometer? Some of the features are explained below: The other end of the galvanometer is in contact with the resistor via a sliding contact as shown in the figure above.


This unit has been specially designed for hospitals and physiotherapy centers where the machine is required to run constantly for many hours to survive with the rush of patients. Rust proof body Durability Easy to potentiometed Specification: This condition is satisfied only when the total battery current has the same value for each measuring range.

Crompton Potentiometer

This potentiometer is supplied with a self standardization circuit built in, which renders If this is not done the voltage drop in switch contact resistances and leads would render the converge of middle dial to less than 0.

Grab it now for very less price. A centre zero type galvanometer is included in the circuit to indicate deflection. The circuit of a single potentiometer may be modified in a simple way to add a second range, which is usually by a second factor, such as 0. The combination of dial resistors and the slide wire is set to the standard cell voltage. The galvanometer circuit includes a set of compensating resistors R 1R 2.

The slide-wire type of potentiometer described in the previous article is not a practical form of construction.

DC Crompton’s Potentiometer or Laboratory Type Potentiometer

The potentiometer is used to monitor the value of temperature where a thermocouple is employed. Find more suppliers in Faridabad Carbon Potentiometer in Faridabad. In actual practice the resistance of the second dial is greater than that between two studs in the main first dial, so that the voltage drop across the second dial is greater than 0.

Crompyon single-range potentiometer shown above is frequently constructed to cover a range of 1. The measuring circuit current I m must be equal to 10 mA in order to produce a voltage drop of 1. There is one dial switch with fifteen steps, each having a precision resistor. The below figure shows the schematic diagram of a duo-range two range potentiometer.


These difficulties to get accurate results mainly arise because of lack of uniformity of slide wire and the difficulties in maintaining the contacts in good shape. These EMFs can be minimised only by special construction i. The two ranges are obtained by using two resistors R 1 and R 2 and a range selecting switch S.

Nature of Business Exporter. Connects Facebook Youtube Videos. Year of Establishment Also, a separate standard cell dial permits the operator to check the standard cell balance at any time during the course of measurement without disturbing the potentiometer setting.

This potentiometer is provided with an independent standardising circuit AD which can be set on any range of standard cell emf from 1. The figure below shows a separate standard cell dial incorporated in a single range potentiometer. Here, if the electric potential of both battery cells is exactly same, there is no circulating current in the circuit and hence the galvanometer shows null deflection. The figure below shows a deflectional potentiometer.

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