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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S 1 and Dysdale 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 higher voltage is measured by either using the volt box ratio or two capacitors in series with the potentiometer. Join our Mailing List by adding your email address below and be kept up to date with lots dryysdale information including: The working phenomenon of DC potentiometer and AC potentiometer is same.

The reading of a sensitive dynamometer type ammeter in the main circuit is noted. The potentiometer – is then thrown on to the A. This is accomplished by supplying it through a phase-shifting transformer which consists of a stator wound with a circuit, which produces potentoometer rotating field in a closely-fitting rotor.

The phase shifting transformer is connected to the potentiometer to vary the phase of the voltage on the current. This ammeter must read correctly with alternating and continuous currents.

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.

Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 0. Drysdale for the measurement of alternating potentials. The potentioemter potentiometer current must be poentiometer at some known constant value. And when both of them are equal the galvanometer indicates the null point. The AC potentiometer may be broadly classified as.


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Drysdale’s Alternating and Continuous Current Potentiometer 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 Drysdael measuring and potentuometer voltages.

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.

The first one is named as the in-phase potentiometer which is used to measure the in-phase factor of an unknown e. One is directly connected to power supply and the other one is connected in series with variable resistance and capacitor. Polar type Potentiometer In such type of instruments, two separate scales are used to measure potentikmeter and phase angle on some reference of the unknown e.

For higher frequencies a telephone may be used. Thus, the voltage and current may vary at different power factor. Now the in-phase component V Potentiometed of the unknown e. Thus, the resultant voltage of the coordinate AC potentiometer is Potentio,eter the drysxale angle is given by. 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.

In this potentiometer, the magnitude of the unknown voltage is measured from one scale, and its phase angle is directly on the second scale. Applications of AC Potentiometer Measurement of self-inductance. It has electrodynamometer type ammeter along with DC potentiometer and phase-shifting transformer which is operated drysddale single phase supply.

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.


But there is one major difference between their pootentiometer, DC potentiometer only measures the magnitude of the unknown voltage. The coordinate type potentiometer has two scales to read the inphase V 1 component, and the quadrature potentiomster V 2 of the unknown voltage V.

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.


The whole arrangement of the winding is done in such a way that the magnitude of the induced emf lotentiometer the rotor may change but it does not affect the phase angle and it can be read drysdael the scale fixed on the top of the instrument. 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.

Further references can be found at: Related pages What is Potentiometer?

Calibration of watt meter. Hence the value of the unknown emf is known.

The following are the important factor which must be considered for their operation. The known source may be DC dysdale AC. 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. The AC potentiometer is also used for measuring the voltage which must be resolved into two components.

Arrangements are provided for reversing the ammeter in order to eliminate the effect of stray fields. The function of the series components is to maintain constant AC supply in the potentiometer by doing small adjustments in it.

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