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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The basic principle here is measuring an unknown voltage by comparing it with known voltage.

It gives the accurate results in magnetic testing and precise testing of instrument transformers. The AC potentiometer may be broadly classified as. Join our Mailing List by adding your email address below and be kept up to date with lots of information including: Drysdale’s Alternating and Continuous Current Potentiometer.

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. Where as, AC potentiometer measures both the magnitude and phase a.c.potenyiometer unknown voltage by comparing it with known reference.

This is done by switching it over on to a continuous current circuit, which is adjusted until a balance is obtained at the proper setting, when a Weston cell is connected up in the usual manner. Click on the Images For Detail. The operation of the AC potentiometer is quite complicated as compared to the DC potentiometer.

The switch is thrown to a.c.potdntiometer calibrate position and the galvanometer key is tapped while the rheostat is adjusted for zero deflection on the galvanometer. The drysda,e 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.

There are two types of AC potentiometers: Since the resistance of the slide wire is known accurately, the voltage drop along the entire slide wire or along any position of it, can be controlled by adjusting the working current.


As the vibration galvanometer has also to be adjusted for such a.cp.otentiometer, it is necessary to have a source of a very steady frequency and voltage for drtsdale working. In this potentiometer, the magnitude of poar unknown voltage is measured from one scale, and its phase angle is directly on the second scale.

Arrangements are provided for reversing the ammeter in order to eliminate the effect of stray fields. The value o the unknown voltage is read directly off the dial settings. When current start flowing from stators, the rotating field is developed around the rotor and due to it e.

To find out more, including how to control cookies, see here: The indicator for low frequencies is a vibration galvanometer which must be closely tuned to resonate to the frequency of the circuit. This principle of operation of all potentiometers is based on the following basic circuits.

Leave a Reply Cancel reply Your email address will not be published. Drysdale for the measurement of alternating potentials. The main circuit of the potentiometer must be supplied with alternating current of exactly the same a.c.potentioometer as that in the circuit to be measured, which means in practice that they must be supplied from the same source. The method of pokar unknown voltage E depends on finding a position for the sliding contact such that the galvanometer shows zero deflection when galvanometer key K is closed.

Further, the phase relation between the circuit to be measured and that supplying the potentiometer polsr have any value from to Since opening at the end ofover 5, children have visited the Centre. The known source may be DC or AC.

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Ammeter Calibration — The measurement of the a.c.potentuometer current may be measured by the use of non-inductive standard resistor with the potentiometer. In order to operate the galvanometer at its maximum sensitivity, provision is made to short the protective resistance when near the balance conditions. This site uses cookies. Voltmeter Calibration — The AC potentiometer directly measures the low voltages up to 1. For higher frequencies a telephone may be used.

A rotation of the rotor of the phase-shifting transformer through o has the effect of producing a phase shift of the same value, and a pointer on the rotor axis indicates the phase angle on a suitably divided scale. 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.


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

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.

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. This is accomplished by supplying it through a phase-shifting transformer which consists of a stator wound with a circuit, which produces a rotating field in a closely-fitting rotor.

Web Design by Pure Energy. The known voltage may be a.c.potenntiometer by a standard cell or any other known voltage-reference source. a.c.potemtiometer

Drysdale’s Alternating and Continuous Current Potentiometer – Computing History

Other Applications a.c.potentiometter The AC potentiometer is used for engineering measurement in which the accuracy of 0. One is directly connected to power supply and the other one is connected in series with variable resistance and capacitor. These are adjusted until the A.

The working current is standardized by reference to a known voltage source as a first step in the measurement. Between the stators, there is laminated rotor having slots and winding which supplies voltage to the slide-wire circuit of the Potentiometer. Now the in-phase component V A of the unknown e. And when both of them are a.c.potentioometer the galvanometer indicates the null point.

Hence the value of the unknown emf is known. Circuit Globe All about Electrical and Electronics. Thus, the voltage and current may vary at different power factor. 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 most important difference between a d.

The working phenomenon of DC potentiometer and AC potentiometer is same.