Crompton Potentiometer complete setup for physics experiment. The slide-wire type of potentiometer described in the previous article is not a practical form of construction. The long slide wire is awkward, and. Potentiometers. Introduction. A Basic dc Potentiometer. Crompton’s dc Potentiometers. Applications of dc Potentiometers. AC Potentiometers.
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The vernier potentiometer reads to the increment of 0. There is also a single turn circular slide wire.
The operation of the duo range potentiometer may be more easily understood and analysed by redrawing in its simplified form by omitting the galvanometer and calibration standardising circuit. However, in this potentiometerthere da three measuring dials.
The switch S is then thrown to the operate position and unknown emf is read by adjusting the measuring circuit dial and slide wire. Cw standardising circuit may be checked for the constancy of working current, anytime during the measurements by simply throwing the switch S back to calibrate position.
This means that current through the galvanometer will always be proportional to the out of balance current whatever may be the setting of the main dials.
This unit has been specially designed for hospitals and physiotherapy centers where the machine is required to run constantly for These EMFs can be minimised only by special construction i. The simplified diagram is shown below. The working current of the potentiometer is 10 mA and therefore each step of dial switch corresponds to 0. Final adjustments are made for zero deflection with the help of the rheostat. This provides a means of standard cell balance resistance to suit the emf value of the particular standard cell used.
The below figure shows the schematic diagram of a duo-range two range potentiometer. In this potentiometer, only one or two main dials, consisting of decade resistance boxes, are used. Measurements are subject to stray thermal and contact EMF s in the potentiometergalvanometer and the measuring circuits. With the protective resistance in the circuit, the potentiometer is balanced by means of the main dial and the slide wire. Single range potentiometer using independent calibrating circuit.
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Brooks deflectional potentiometer is used for applications where the voltage to be measured is continuously changing, with a conventional type of potentiometersit becomes impossible to obtain exact balance even when the changes are slow since it is difficult to follow the changes by manipulation of the dials.
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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. Provided in different specifications, this range is used for various medical and commercial applications. After completion of standardisation, the switch ‘S’ is thrown to operate position thereby connecting the unknown emf into the potentiometer circuit.
Newer Post Older Post Home. 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 long slide wire is awkward, and even for the length shown cannot be read to a very great degree of precision.
Chand ” is the best in industry. If a third range of x 0. 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 protective resistance is kept in the circuit in the initial stages so as to protect the galvanometer from being getting damaged. 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.
The output of the thermocouple is fed to the unknown emf terminals. Grab it now for very less price. The following steps are used when making measurements with the above potentiometer: The slide wire is provided with scale divisions and since the total resistance of slide wire corresponds to a voltage drop of 0.
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The value of the unknown emf is obtained by adding the galvanometer reading to the main dial setting. However, for some applications higher precision and accuracy are needed, requiring changes in design features. The two ranges are obtained by using two resistors R 1 and R 2 and a range selecting switch S.
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. In order to operate the galvanometer at its maximum sensitivity provision is made to short the protective resistance when near the balance conditions.
Some of the features are explained below: Construction and Working of basic slide wire dc Potentiometers. Find more suppliers in Faridabad Carbon Potentiometer in Faridabad. Duo range type potentiometer. The first dial measures upto 1.