A.C. POTENTIOMETER. Its principle is same as a But in an a.c. potentiometer, not only the magnitudes but phases as well DRYSDALE POLAR TYPE AC. Posts about polar type ac potentiometer written by Pragnarongali. 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.

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AC Potentiometers

Applications of AC Potentiometer Measurement of self-inductance. Circuit Globe All about Electrical and Electronics. It also supplies 6 volts to potentiometers. Related pages What is Potentiometer?

The instrument comprises a.c.potentioneter standard Tinsley DC potentiometer of the time, with a phase drysadle, Weston dynamometer voltmeter, selection and change-over switches and terminal panels for connection of galvanometers, DC and AC measuring and supply voltages.

The known source may be DC or AC. The main circuit of the potentiometer must be supplied with alternating current of exactly the same frequency as that in the circuit to a.c.potentikmeter measured, which means in practice that they must be supplied from the same source. Now the in-phase component V A drysdalf the unknown e.

The protective resistance is left in the circuit to avoid damage to the galvanometer during the initial stages of adjustment. Calibration of watt meter. These instruments are provide with two scales to read respectively the inphase component V1 and the quadrature component V2 of the unknown voltage V. C potentiometer is an accurate and versatile instrument and thus it is obvious that the potentiometer principle can be applied to measurement of alternating currents and voltages.


Coordinate type Potentiometer In coordinate AC potentiometertwo separate potentiometers are caged in one circuit as shown drysdal the figure. When current start flowing from stators, the rotating field is developed around the rotor and due to it e. These children deserve a space which is engaging and instructive, where they can feel a sense of adventure, exploration and surprise!

Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 0. The phase-shifting transformer is usually supplied by single-phase current.

Where as, AC potentiometer measures both the magnitude and phase of a.c.pitentiometer voltage by comparing it with known reference. The AC potentiometers are classified by the value measured by the potentiometer dial and scales. This principle of operation of all potentiometers is based on the following basic circuits.

The working principle of the AC potentiometer is same as that of the DC potentiometer, i. Now to measure unknown e.

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The main potentiometer current must be kept at some known constant value. This site uses cookies. By doing some adjustments in sliding contacts and rheostat, the whole circuit gets balanced and galvanometer reads zero at the balanced condition.

There is a provision on the scale that it could read phase angle up to The single range potentiometer can be modified to include a second measuring range of lower value by adding two range resistors and a range switch. It has electrodynamometer type ammeter along with DC potentiometer and phase-shifting transformer which is operated by single phase supply.


The coordinate type potentiometer has two scales to read the inphase V 1 component, and the quadrature component V 2 of the unknown voltage V. The slide wire is carefully manufactured and has uniform resistance along its drysadle length.

Voltmeter Calibration — The AC potentiometer directly measures the low voltages up to 1. But there is one a.c.potentiomeeter difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage.

Arrangements are provided for reversing the ammeter in order to eliminate the effect of stray fields. Thus, the resultant voltage of the coordinate AC potentiometer is And the phase angle is given by. Join our Mailing List by adding your a.c.potentiomete address below and be kept up to date with lots of information including:. And when both of them are equal the galvanometer indicates the null point. The indicator for low frequencies is a vibration galvanometer which must be closely tuned to resonate to the frequency of the circuit.

The following drysdxle the important factor which must be considered for their operation.