March 11, 2020

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

Arrangements are provided for reversing the ammeter in order to eliminate the potentiometr of stray fields. This is accomplished potetniometer 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. The AC potentiometer may be broadly classified as.

Measurements of Self Reactant of a Coil — The standard reactance is placed in series with the coil whose reactance is to be measured. Where as, AC potentiometer measures both the magnitude and phase of unknown voltage by comparing it with known reference. These children deserve a space which is engaging and instructive, where they can feel a sense of adventure, exploration and surprise!

The higher voltage is measured by either using the volt box ratio or two capacitors in series with the potentiometer.

Drysdale ac polar potentiometer

Now to measure unknown e. Circuit Globe All about Electrical and Electronics.


When current start flowing from stators, the rotating field is developed around the rotor and due to it e. Web Design by Pure Energy.

But there is one major difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage. It also supplies 6 volts pootentiometer potentiometers. As it is necessary to have the splitphase circuit somewhere near the resonating point, it must be adjusted for changes of frequency.

Drysdale’s Alternating and Continuous Current Potentiometer – Computing History

Please be assured that any amount you feel able to donate will make an immediate and significant impact. The working phenomenon of DC potentiometer and AC potentiometer is same.

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

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 references can be found at: Drysdale for the measurement of alternating potentials. Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 0.

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The phase shifting transformer is connected to the potentiometer to vary the phase of the potentiomster on the current. The potentiometwr 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. Ammeter Calibration — The measurement of the alternating current may be measured by the use of non-inductive standard resistor with the potentiometer.

The first one is named as the in-phase potentiometer which is used to measure the in-phase factor rdysdale an unknown e. Hence the value of the unknown emf is known. Between the stators, there is laminated rotor having slots and winding which supplies voltage to the slide-wire circuit of the Potentiometer. It has electrodynamometer type ammeter along with DC potentiometer and phase-shifting transformer which is operated by single phase supply.


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 AC measuring and supply voltages.

By doing some adjustments in sliding contacts and rheostat, the whole circuit gets balanced and drydale reads zero at the balanced condition. We are extremely grateful for the very kind donation from Rosemary Helme of this Drysdale Alternating and Continuous Current Potentiometer.

For higher frequencies a telephone may be used. drysddale

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

Connects Facebook Youtube Videos. 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. Thus, the resultant voltage of the coordinate AC potentiometer is And the phase angle is given by. Coordinate type Potentiometer In coordinate AC potentiometertwo separate potentiometers are caged in one circuit as shown in the figure. Measures voltage as magnitude and phase from reference voltage.

Drysdale’s Alternating and Continuous Current Potentiometer. And when both of them are equal the galvanometer indicates the null point. There is a provision on the scale that it could read phase angle up to Voltmeter Calibration — The AC potentiometer directly measures the low voltages up to 1.