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When the e.m.f. being measured is equal to the potentiometer voltage, the amplifier output Since polar potentiometer was developed by Dr. C.V. Drysdale , it is. Dr. C.V. Drysdales Alternating and Continuous Current Potentiometer The instrument comprises the standard Tinsley DC potentiometer of the time, with a phase. In a.c. potentiometers, another requirement is the control of stray e.m.f.s in fields Being a polar type, Drysdale – Tinsley a.c. potentiometer measures unknown.

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AC Potentiometer

For higher frequencies a telephone may be used. The known source may be DC or AC. Potentiomter are two types of AC potentiometers: Related pages What is Potentiometer?

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The main potentiometer current must be kept at some known constant value. 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.

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 Drsydale. The function of the series components is to maintain constant AC supply in the potentiometer by doing small adjustments in it.

Measures voltage as magnitude and phase from reference voltage.

Drysdale’s Alternating and Continuous Current Potentiometer – Computing History

Applications of AC Potentiometer Measurement of self-inductance. Join our Mailing List by adding your email address below and be kept up to date with lots of information including: Web Design by Pure Energy. Drysdale’s Alternating and Continuous Current Potentiometer.

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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 potentiomrter the in-phase factor of an unknown e.

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

Arrangements are provided for reversing the ammeter in order to eliminate the effect of stray fields. 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 reading of a sensitive dynamometer type ammeter in the main circuit is noted. 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. Now the in-phase component V A of the unknown e.

These children deserve a space which is engaging and instructive, where they can feel a sense of adventure, exploration and surprise! 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.

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The working phenomenon of DC potentiometer and AC potentiometer is same. Drysdale for the measurement of alternating potentials. This ammeter must read correctly with alternating and continuous currents. One is directly pitentiometer to power supply and the other one is connected in series with variable resistance and capacitor. These are adjusted until the A.

What is DRYSDALE POTENTIOMETER? definition of DRYSDALE POTENTIOMETER (Science Dictionary)

It has electrodynamometer type ammeter along with DC potentiometer and phase-shifting transformer which is operated by single phase supply. The 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 potentiomeger.

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. Further references can be found at: Further, the phase relation between the circuit to be measured and that supplying the potentiometer may have any value from to Click on the Images For Detail.