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

The working principle of the AC potentiometer is same as that of the DC potentiometer, i. And when both of them are equal the galvanometer indicates the null point.

Hence the value of the unknown emf is known. The operation of the AC potentiometer is quite complicated as compared to the DC potentiometer. The following are the important factor which must be considered for their operation. The AC potentiometers are classified by the value measured a.c.poteentiometer the potentiometer dial and scales.


The AC potentiometer may be broadly classified as. In this potentiometer, the magnitude of the unknown voltage is measured from one scale, and its phase angle is directly on the second scale. The coordinate type potentiometer has two scales to a.c.potentimoeter the inphase V 1 component, and the quadrature component V 2 of the unknown voltage V.

Voltmeter Calibration — The AC potentiometer directly measures the low voltages up to 1.

The higher voltage is measured by either using the volt box ratio or two capacitors in series with the potentiometer.

Ammeter Calibration — The measurement of the alternating current may be measured by the use of non-inductive standard resistor with the potentiometer. The phase shifting transformer is connected to the potentiometer to vary the phase of the voltage on the current. Thus, the voltage and current may vary at different power factor. Measurements of Self Reactant of a Coil pklar The standard reactance is placed in series with the coil whose reactance is a.c.otentiometer be measured.


AC Potentiometer

Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 0. The AC potentiometer is also used for measuring the voltage which must be resolved into two components.

It gives the accurate results in magnetic testing and precise testing of instrument transformers. Your email address will not be published. Circuit Globe All about Electrical and Electronics. Leave a Reply Cancel reply Your email address will not be published.