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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The slide wire is provided with scale divisions and since the total resistance of slide wire corresponds to a voltage drop of 0. To fulfill the diversified demands of our clients, we offer these products at budget friendly prices. This is the speciality of a potentiometer, it can measure voltage most accurately. I agree to the terms and privacy policy. The resistor has the uniform electrical resistance per unit length throughout its length.

This instrument has two ranges: Chand ” is the best in industry. Reasonably rapid changes in galvanometer the indication can be followed with ease which is impossible to take with conventional potentiometers. Thus the galvanometer scale can be cromptno to read the out of balance emf directly.

This is how a potentiometer measures the voltage between two points potemtiometer between A and B without taking any current component from the circuit. The main dial setting is kept nearly equal to the emf being measured.

Call Send a quick message. Crompton Potentiometer Get Latest Price. The switch S is then thrown to the operate position and unknown emf is read by adjusting the measuring circuit dial and slide wire. Number of Employees Upto 10 People.

The other end of the galvanometer is in contact with the resistor via a sliding contact as shown in the figure above. 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.

DC Crompton’s Potentiometer or Laboratory Type Potentiometer

In order to operate the galvanometer at its maximum sensitivity provision is made to short the protective resistance when near the balance conditions. The potentimeter slide wire is awkward, and even for the length shown cannot be read to a very great degree of precision.


The potentiometer is used to monitor the value of temperature where a thermocouple is employed. 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.

As the balance or null point is approached, the protective resistance is shorted so as to increase the sensitivity of the galvanometer. 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.

This potentiometer is supplied with a self standardization circuit built in, which renders Digital Potentiometer in Ambala. The value of the compensating resistors is such that the resistance of the potentiometer circuit, as viewed from terminals, where the unknown emf is applied, remains constant irrespective of the position of the sliding contacts.

The two ranges are obtained by using two resistors R 1 and R 2 and a potentiomeer selecting switch S.

DC Crompton’s Potentiometer or Laboratory Type Potentiometer

You can download this article as pdf, ppt. The first dial measures upto 1. This completes the standardisation process for the potentiometer.

As the balance is approached, the protective resistance cromptonn shorted, and final adjustments are made to obtain true balance. Taking the advantage of our latest infrastructure facilities, we are engaged in manufacturing and exporting a wide range of Laboratory Instruments. Thus a considerable change in standard cell emf owing to temperature changes can be allowed for the operation of the circuit below.

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Crompton DC Potentiometer Calibration of PMMC Ammeter

If the new reading does not agree with the old one, the second measurement of unknown emf must be made. In this potentiometer, only one or two main dials, consisting of decade resistance boxes, are used.

pitentiometer Here, if the electric potential of both battery cells is exactly same, there is no circulating current in the circuit and hence potentiomrter galvanometer shows null deflection.


Year of Establishment That means, emf of the standard cell is just balanced by the voltage appearing in the resistor across point A and B. Find more suppliers in Faridabad Carbon Potentiometer in Faridabad. The standardisation of the potentiometer is checked again by returning the switch S to the calibrate position.

This condition is satisfied only when the total battery current has the same value for each measuring range. Get best deals for coconut. Modern laboratory type potentiometers use calibrated dial resistors and a small circular wire of one or more turns, thereby reducing the size of the instrument.

The third dial is obtained from a shunt circuit which permits a true zero and a small negative setting to be obtained. The simplified diagram is shown below. Newer Post Older Post Home.

Potentiometer Working Principle of Potentiometer

The output of the thermocouple is fed to the unknown emf terminals. This unit has been specially designed for hospitals and physiotherapy centers where the potentipmeter is required to run constantly for Hence, voltage drop per unit length of the resistor is equal throughout its length.

Laboratory-type or DC Crompton’s Potentiometer: The basic working principle of potentiometer is quite simple. This means that current through the galvanometer will always be proportional potentiomefer the out of balance current whatever may be the setting of the main dials.

After completion of standardisation, the switch ‘S’ is thrown to operate position thereby connecting the unknown emf into the potentiometer circuit. 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.

The figure below shows a potentimoeter potentiometer. The standardisation should be again checked after the completion of the measurement.