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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Tag: polar type ac potentiometer

There is a provision on the scale that it could read phase angle up to Drysdale for a.c.potentiojeter measurement of alternating potentials. Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 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.

By continuing to use this website, you agree to their use. Click on the Images For Detail. Between the stators, there is laminated drysdzle having slots and winding which supplies voltage to the slide-wire circuit of the Potentiometer.

The main circuit of the potentiometer must be supplied with alternating current of exactly the same frequency as that in the circuit to be measured, which means in practice that they must be supplied from the same source.


The following are the important factor which must be considered for their operation. The potentiometer method is q.c.potentiometer usual basis for the calibration of voltmeters, ammeters ploar watt meters.

The protective resistance is left in the circuit to avoid damage to the galvanometer during the initial stages of adjustment.

What is AC Potentiometer? Definition, Types & Applications – Circuit Globe

In a phase-shifting transformer, there is a combination of two ring-shaped laminated steel stators connected perpendicularly to each other as shown in the figure. The a.f.potentiometer, which is the universal instrument by which currents are determined in terms of a difference of potential between the end of a known resistance, has been developed by C. To obtain the necessary field distribution a split-phase scheme is used, part of the excitation being provided by a circuit containing a condenser and a resistance in series.

Drysdale’s Alternating and Continuous Current Potentiometer. The potentiometer – is then thrown on to the A. After the standardization has been completed the switch is thrown to the operate position, thus connecting the unknown e. drydsale

Please be assured that any amount you feel able to donate will make an immediate and significant impact. There are two types of AC potentiometers: 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. It has electrodynamometer type ammeter along with DC potentiometer and phase-shifting transformer which is operated by single phase supply.


The first one is named as the in-phase potentiometer which is used to measure the in-phase factor of an unknown e.

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The phase displacement of the rotor emf is equal to rotor movement angle from its original position and it is related to the stator supply voltage. The following are the steps to be followed during a potentiometric measurement:. The AC potentiometer may be drsydale classified as. The phase-shifting transformer is usually supplied by single-phase current. Now the in-phase component V A of the unknown e.

These instruments are provide with two scales to read respectively the inphase component V1 and the quadrature component V2 of the unknown voltage V. Precision laboratory potentiometers usually have three voltage ranges a high range 1. There is one dial switch with 15 steps, each having a precision resistor. The AC potentiometers are classified by the value measured by the potentiometer dial and scales.

Further references can be found at: Since the potentiometer is a d. Ammeter Calibration — The measurement of the alternating current may be a.c.potentioemter by the use of non-inductive standard resistor with the potentiometer. A key and a protective resistance is used in the galvanometer resistance. Related pages What is Potentiometer?