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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Thus a considerable change in standard cell emf owing to temperature changes can be allowed for the operation of the circuit below.

Potentiometer Working Principle of Potentiometer

If the new reading does not agree with the old one, the second measurement of unknown emf must be made. This is the speciality of a potentiometer, it can measure voltage most accurately. 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.

Final adjustments are made for zero deflection with the help of the rheostat.

The moving arm of middle dial carries two arms spaced two studs apart. The standardisation should be again checked after the completion of the measurement. Find more suppliers in Faridabad Carbon Potentiometer in Faridabad. If you have questions, then you can email me palakalaamarnath gmail.

DC Crompton’s Potentiometer or Laboratory Type Potentiometer

A drop of 1. This does not mean, unfortunately, that small voltages can be read with assurance to 0. The protective resistance is kept in the circuit in the initial stages so as to protect the galvanometer from being getting damaged. The measuring circuit current I m must be equal to 10 mA in order to produce a voltage drop of 1. Electrical measurementsMeasurements. This condition is satisfied only when the total battery current has the same value for each measuring range.


Hence, voltage drop per unit length of the resistor is equal throughout its length.

The galvanometer circuit includes a set of compensating resistors R 1R 2. This potentiometer is provided with a double throw switch which allows the connection of either the standard cell or the unknown emf to be applied to the working circuit. Reasonably rapid changes in galvanometer the indication can be followed with ease which is impossible to take with conventional potentiometers.

The value of unknown emf is read off directly from the settings of the dial adjust slide wire. This provides a means of standard cell balance resistance to suit the emf value of the particular standard cell used. The third dial is obtained from a shunt circuit which permits a true zero and a small negative setting to be obtained.

Newer Post Older Post Home. Number of Employees Upto 10 People. Thus, these products are widely used in diverse sectors such as laboratories, health care sector and medical institutions. These EMFs may be of the order of one to several microvolts and are difficult to locate and control. Now, the positive terminal of a standard cell is connected to point A on the resistor and negative terminal of the same is connected with a galvanometer.

DC Crompton’s Potentiometer or Laboratory Type Potentiometer

These EMFs can be minimised only by special construction i. I agree to the terms and privacy policy. Call Send a quick message. The simplified diagram is shown below. To fulfill the diversified demands of our clients, we offer these products at budget friendly prices.

Crompton DC Potentiometer Calibration of PMMC Ammeter

The switch S is thrown to the calibrate position and the galvanometer key is tapped while the rheostat is potentiometeer for zero deflection on the galvanometer.

Our products are widely renowned for their salient features such as reliability, durability, cutting edge clarity and optimum performance. Digital Potentiometer in Ambala.

Get Best Price Request a quote. This unit has been specially designed for hospitals and physiotherapy centers where the machine is required to run constantly for The selector switch S is put in the calibrate position and the rheostat is adjusted so that there is no current flowing through the galvanometer.


This fixes the working current to its proper value. As the balance or null point is approached, the protective resistance is shorted so as to increase the sensitivity of the galvanometer. This instrument has two ranges: The operation of the duo range potentiometer may be more easily understood and analysed by redrawing in its simplified form potentiometfr omitting the galvanometer and calibration standardising circuit.

Our highly experienced and professional team of experts offers these products as per the diverse application requirements of lotentiometer industries. Connects Facebook Youtube Videos. As the balance is approached, the protective resistance is shorted, and final adjustments are made to obtain true balance. With the protective resistance in the circuit, the potentiometer is balanced by means of the main dial and the slide wire.

Direct reading type, improved from with standardizing coil consisting of 8 potentiomete and a circular slide wire The scale is divided into parts with potential drop of mill volts Fine and coarse potentiomeer are provided for adjusting the slide wire current Range 0.

Suppose, by adjusting the rheostat we get v volt voltage drop appearing per unit length of the resistor. Find more suppliers in Faridabad Xrompton Potentiometer in Faridabad. Crompton Potentiometer Get Latest Price.

All modern potentiometers incorporate a separate standard cell dial circuit calibrating circuit. Get Best Price Request a quote. The figure below shows a separate standard cell dial incorporated in a single range potentiometer. The limitations imposed on the performance of ordinary potentiometers by slide wire are eliminated in a vernier potentiometer.