The Potentiometer is an instrument which measures unknown voltage by balancing it with a known voltage. The known source may be DC or. Definition of DRYSDALE POTENTIOMETER: An ac potentiometer of the polar type, comprising a phase-shifting transformer and resistive voltage divider. Definition: The potentiometer which is used for measuring the phase and the magnitude of the unknown emf by comparing it with the known emf such type of.

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It also supplies 6 volts to potentiometers. The AC potentiometer is also used for measuring the voltage which must be resolved into two components.

The indicator for low frequencies is a vibration galvanometer which must be closely tuned to resonate to the frequency of the circuit. Please be assured that any amount you feel able to donate will potenyiometer an immediate and significant impact.

Further references can be found at: Web Design by Pure Energy. Your email address will not be published. One is directly connected to power supply and the other one is connected in series with variable resistance and capacitor.

It has electrodynamometer type ammeter along with DC potentiometer and phase-shifting transformer which is operated by single phase supply. The rotor has a winding on it which supplies the potentiometer current. When current start flowing from stators, the rotating field is developed around the rotor and due to it e.


Drysdale’s Alternating and Continuous Current Potentiometer – Computing History

The known source may be DC or AC. But there is one potengiometer difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage.

In a phase-shifting transformer, there is a combination of two ring-shaped laminated steel potentilmeter connected perpendicularly to each other as shown in the figure. The reading of a sensitive dynamometer type ammeter in the main circuit is noted.

The 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.

AC Potentiometers

By doing some adjustments in sliding contacts and rheostat, the whole circuit gets balanced and galvanometer reads zero at the balanced condition. Voltmeter Calibration — The AC potentiometer directly measures the low voltages up to 1. 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.

Applications of AC Potentiometer Measurement of self-inductance. The AC potentiometers are classified by the value measured by the potentiometer dial and scales. The function of the series components is to maintain constant AC supply in the potentiometer by doing small adjustments in it. The working principle of the AC potentiometer is same as that of the DC potentiometer, i.


Click on the Images For Detail. The potentiometer – is then thrown on to the A. Calibration of watt meter.

It gives the accurate results in magnetic testing and precise testing of instrument transformers. As it is necessary to have the splitphase circuit somewhere near the resonating point, it must be adjusted for changes of drysdzle.

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 potnetiometer rotor axis indicates the phase angle on a suitably divided scale.

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.

Now to measure unknown e. Circuit Globe All about Electrical and Electronics. The working phenomenon of DC potentiometer and AC potentiometer is same. And when both of them are equal the galvanometer indicates the null point. Hence the value of the unknown emf is known. Coordinate type Potentiometer In coordinate AC potentiometertwo separate potentiometers are caged in one circuit as shown in the figure.

There are two step-down pootentiometer T 1 and T 2 which isolate potentiometer potentioometer the line and give an earthed screens protection between the winding.