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.

Author: Akizilkree Kazijind
Country: Comoros
Language: English (Spanish)
Genre: History
Published (Last): 13 May 2009
Pages: 294
PDF File Size: 8.7 Mb
ePub File Size: 13.32 Mb
ISBN: 859-2-48861-974-2
Downloads: 34161
Price: Free* [*Free Regsitration Required]
Uploader: JoJojar

There is a provision on the scale that it could read phase angle up to optentiometer The instrument 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. 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.

The phase-shifting transformer is usually supplied by single-phase current.

AC Potentiometers

Where as, AC potentiometer measures both the magnitude and phase of unknown voltage by comparing it with known reference. As it is necessary to have the splitphase drydsale somewhere near the resonating point, it must be adjusted for changes of frequency. For higher frequencies a telephone may be used.

The AC potentiometers are classified by the value measured by the potentiometer dial and scales. Further, the phase relation between the circuit to be measured and that supplying the potentiometer may have any value from to Now to measure unknown e.

Ammeter Calibration — The measurement of the alternating current may be measured by the use of non-inductive standard drysvale with the potentiometer.

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

The AC potentiometer is also used for measuring the voltage which must be resolved into two components. This ammeter must read pohentiometer with alternating and continuous currents.

Your email address will not be published.

Applications of AC Potentiometer Measurement of self-inductance. The known source may be DC or AC. It also supplies 6 volts to potentiometers. By doing some adjustments in sliding contacts and rheostat, the whole circuit gets balanced and galvanometer reads zero at the balanced condition.


Related pages What is Potentiometer? Polar type Potentiometer In such type of instruments, two separate scales are used to dryedale magnitude and phase angle on some reference of the unknown e. Connects Facebook Youtube Videos. These children deserve a space which is engaging and instructive, where they can feel a sense of adventure, exploration and surprise! 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.

Join our Mailing List by adding your email address below and be kept up to date with lots of information including: Further references can be found at: Please be assured that any amount you feel able to donate will make an immediate and significant impact. The higher voltage is measured by either using the volt box ratio or two capacitors in series drysrale the potentiometer.


The following are the important factor which must be considered for their operation. Hence potentiomeetr value of the unknown emf is known. The working principle of the AC potentiometer is same as that of the DC potentiometer, i.

The AC potentiometer may be broadly classified as. Web Design by Pure Energy. Join our Mailing List by adding your email address below and be kept up to date with lots of information including:.

The main potentiometer current must be kept at some known constant value. The working phenomenon of DC potentiometer and AC potentiometer is same. Voltmeter Calibration — The AC potentiometer directly measures the potenfiometer voltages up to 1. Thus, the resultant voltage of the coordinate AC potentiometer is And the phase angle is given by. 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.

Between the stators, there is potentiiometer rotor having slots and winding which supplies voltage to the slide-wire circuit of the Potentiometer. Drysdale for ppotentiometer measurement of alternating potentials. One is directly connected to power supply and the other one is connected in series with variable resistance and capacitor.


Calibration of watt meter. The indicator for low frequencies is a drysdald galvanometer which must be closely tuned to resonate to the frequency of the circuit. Now the in-phase component V A of the unknown e. There are two types of AC potentiometers: The “balance” is obtained by successive approximation of the usual adjustment of the potentiometer contacts dial and slide wire reading and of the phase-shifting transformer until the indicator shows no deflection.

The whole arrangement of the potnetiometer is done in such a way that the magnitude of the induced emf in the rotor may change but it does not ptoentiometer the phase angle and it can be read on the scale fixed on the top of the instrument. 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 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. Since opening at the end ofover 5, children have visited the Centre. 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. The reading of a sensitive dynamometer type ammeter in the main circuit is noted.

The first one is named as the in-phase potentiometer which is used to measure the in-phase factor of an unknown e. Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 0.

Leave a Reply Cancel reply Your email address will not be published.

Author: admin