#Dc crompton potentiometer pdf download

The combination of dial resistors and the slide wire is set to the standard cell voltage. The standardisation should be again checked after the completion of the measurement. Crompton DC Potentiometer Calibration of PMMC Ammeter The selector switch S is put potetniometer the calibrate position and the rheostat is adjusted so that there is no current flowing through the galvanometer.Д¬all Send a quick message. 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 figure below shows a separate standard cell dial incorporated in a single range potentiometer. These EMFs can be minimised only by special construction i. The single-range potentiometer shown above is frequently constructed to cover a range of 1. The frompton circuit includes a set of compensating resistors R 1R 2. Reasonably rapid changes in galvanometer the indication can be followed with ease which is impossible to take with conventional potentiometers. The following steps are used when making potenttiometer with the above potentiometer: Laboratory-type or DC CromptonвЂ™s Potentiometer: In order to operate the galvanometer at its maximum sensitivity provision is made to short the protective resistance when near the balance conditions.ДЄs the balance or null point is approached, the protective resistance is shorted so as to increase the sensitivity of the galvanometer. This does not mean, unfortunately, that small voltages can be read with assurance to 0. This potentiometer is supplied with a self standardization circuit built in, which renders This potentiometer uses the Kelvin Varley arrangement shown below.

#Dc crompton potentiometer pdf download

Free Ebooks dc crompton potentiometer theory for download in PDF, MOBI, EPUB, HTML for Amazon Kindle and other Ebooks Readers. The magnitude of the current is adjusted in such a way that the voltage drop across the resistance is equal to 1 volt.This article discusses about Potentiometers, construction, working, its applications and also different types which include rotary and linear Potentiometer. The ammeter is used in the circuit for determining the magnitude of current passing through resistor during the reading. If the magnitude of current remains same, the circuit gives the accurate result.

The accuracy of the unknown resistance also depends on the magnitude of the current at the time of the readings. The accuracy of unknown resistance depends on the value of standard resistance. On equating the equation (1) and (2), we get The switch, when moves to position 1, 1 the unknown resistance connects to the circuit, and when it moves to position 2, 2 the standard resistance connects to the circuit.Д¬onsider that when the switch is in position 1,1 the voltage drop across the unknown resistance is V rДЄnd when it is in 2, 2 the voltage drop across the resistance is V s The double pole double throw switch is used in the circuit. The rheostat is used for controlling the magnitude of current into the circuit. The S is the standard resistance from which the value of unknown resistance is compared. The R is the unknown resistance whose value is needed to be measured. Let understand this with the help of the circuit diagram.