The AC potentiometers are classified by the value measured by the potentiometer dial and scales. After the standardization has a.c.potejtiometer completed the switch is aa.c.potentiometer to the operate position, thus connecting the unknown e. 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. It gives the accurate results in magnetic testing and precise testing of instrument transformers. Hence the value of the unknown emf is known. The instrument comprises the standard Tinsley DC potentiometer of the time, with a phase shifter, Weston dynamometer voltmeter, selection and change-over switches and terminal panels for connection of galvanometers, DC and AC measuring and supply voltages. What is AC Potentiometer? Definition, Types & Applications – Circuit GlobeĪs balance is approached, the protective resistance is shorted and final adjustments are made to obtain a true balance condition.
DC CROMPTON POTENTIOMETER PDF SERIES
The higher voltage is measured by either using the volt box ratio or two capacitors in series with the potentiometer. It also supplies 6 volts to potentiometers. It has drrysdale type ammeter along with DC potentiometer and phase-shifting transformer which is operated by single phase supply. There is one dial switch with 15 steps, each having a precision resistor. When current start flowing from stators, the rotating field is developed around the rotor and due to it e.
The following are the steps to be followed during a potentiometric measurement. A key and a protective resistance is used in the galvanometer resistance.
The operation of the AC potentiometer is quite complicated as compared to the DC potentiometer.
DC CROMPTON POTENTIOMETER PDF HOW TO
There is a provision on the scale that it could read phase angle up to To find out more, including how to control cookies, see here: The protective resistance is left in the circuit a.c.potemtiometer avoid damage to the galvanometer during the initial stages of adjustment.Īpplications of AC Potentiometer Measurement of self-inductance. The known voltage may be supplied by a standard cell or any other known voltage-reference source. The method of measuring unknown voltage E depends on finding a position for the sliding contact such that the galvanometer shows zero deflection drysdael galvanometer key K is closed. The working principle of the AC potentiometer is same as that of the DC potentiometer, i.e., the unknown voltage is determined by Polar Type Potentiometer.Ĭircuit Globe All about Electrical and Electronics. Posts about polar type ac potentiometer written by Pragnarongali. potentiometer, not only the magnitudes but phases as well DRYSDALE POLAR TYPE AC. Its principle is same as a But in an a.c.
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