DRYSDALE POLAR A.C.POTENTIOMETER PDF

Tesar Measures voltage as magnitude and phase from reference voltage. As it is necessary to have the splitphase circuit somewhere near the resonating point, it must be adjusted for changes of frequency. The main potentiometer current must be kept at some known constant value. The known source may be DC or AC. Related pages What is Potentiometer? 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.

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Vunos The rotor has a winding on it which supplies the potentiometer current. As the vibration galvanometer has also to be adjusted for such changes, it is necessary to have a source of a very steady frequency and voltage for satisfactory working. Further, the phase relation between the circuit to be measured and that supplying the potentiometer may have any value from to Measures voltage as magnitude and phase from reference voltage.

Web Drysdwle by Pure Energy. Calibration of watt meter. One is directly connected to power supply and the other one is connected in series with variable resistance potentiometwr capacitor. There is a provision on the scale that it could read phase angle up to These are adjusted until the A. The potentiometer — is then thrown on to the A. Coordinate type Potentiometer In coordinate AC potentiometertwo separate potentiometers are caged in one circuit as shown in the figure.

As it is necessary to have the splitphase circuit somewhere near the resonating point, it must be adjusted for changes of frequency. The function of the series components is to maintain constant AC supply in the potentiometer by doing small adjustments in it.

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.

S 1 and S 2 are signs changing switches which are used to change the polarity of the test voltage if it is required for balancing the Potentiometer.

Click on the Images For Detail. The phase-shifting transformer is usually supplied by single-phase current. There are two types of AC potentiometers: This ammeter dryadale read correctly with alternating and continuous currents. There are two step-down transformers T 1 and T 2 which isolate potentiometer from the line and give an earthed screens protection between the winding.

The reading of a sensitive dynamometer type ammeter in the main circuit is noted. Further references can be found at: By doing some adjustments in sliding contacts and rheostat, the whole circuit gets balanced and galvanometer reads zero at the balanced condition.

Since opening at the end ofover 5, children have visited the Centre. 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. Join our Mailing List by adding your email address below and be kept up to date with lots of information including:.

A rotation of the rotor of the phase-shifting transformer through o has drysdals 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. But there is one major difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage.

Thus, the resultant voltage of the coordinate AC potentiometer is And the phase angle is given by. When current start flowing from rrysdale, the rotating field is developed around the rotor and due to it e.

Now to measure unknown e. Please be assured that any amount you feel able to donate will make an immediate and significant impact. Polar type Potentiometer In such type of instruments, two separate scales are used to measure magnitude and phase angle on some reference of the unknown e. The instrument comprises the standard Tinsley DC potentiometer of the time, with a phase shifter, Weston dynamometer voltmeter, selection and drysdalee switches and terminal panels for connection of galvanometers, DC and AC measuring and supply voltages.

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.

The main potentiometer current must be kept at some known constant value. It has electrodynamometer type ammeter along with DC potentiometer and phase-shifting transformer which is operated by single phase supply.

AC Potentiometers The indicator for low frequencies is a vibration galvanometer which must be closely tuned to resonate to the frequency of the circuit. The known source may be DC or AC. In order to obtain a balance, as indicated by the detecting instrument, it must be possible to give to the potentiometer current any phase displacement relative to that of the potential supplying it.

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Molar Since opening at the end ofover 5, children have visited the Centre. Further references can be found at: Now to measure unknown e. It has electrodynamometer type ammeter along with DC potentiometer and phase-shifting transformer which drysdzle operated by single phase supply. The main potentiometer current must be kept at some known constant value.

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AC Potentiometer

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. In AC potentiometer, the frequency and the waveform of the current must be same as that of the voltage being measured.

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DRYSDALE POLAR POTENTIOMETER PDF

The combination of dial resistors and slide wire is set to the value of the standard cell voltage. AC Potentiometers The main circuit of the potentiometer must be supplied with alternating current of exactly the same frequency as that dryedale the circuit to be measured, which means in practice that they must be supplied from the same source. But there is drysdalle major difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage. Arrangements are provided for reversing s.

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