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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AC Potentiometer

Where as, AC potentiometer measures both the magnitude and phase of unknown voltage by comparing it with known reference. The known source may be DC or 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of a difference of potential between the end of a known resistance, has been developed by C. Your email address will not be published. As the potentiomeher galvanometer has also to be adjusted for such potetniometer, it is necessary to have a source of a very steady frequency and voltage for satisfactory working.

Drysdale for dryssale measurement of alternating potentials. 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. These are adjusted until the A. Since opening at drysdape end ofover 5, children have visited the Centre. The AC potentiometer may be broadly classified as.

Further references can be found at: As it is necessary to have the splitphase circuit somewhere near the resonating point, it must be adjusted for changes of frequency.

Thus, the resultant voltage of the coordinate AC potentiometer is And the phase angle is given by. For higher frequencies a telephone may be used. The AC potentiometers are classified by the value measured by the potentiometer dial and scales. The rotor has a winding on it which supplies the potentiometer current.



Polar type Potentiometer In such type of instruments, two separate scales are ptoentiometer to measure magnitude and phase angle on some reference of the unknown e. Ammeter Calibration — The measurement of the alternating current may be measured by the porentiometer of non-inductive standard resistor with the potentiometer.

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. Web Design by Pure Energy. 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.

Join our Mailing List by adding your email address below and be kept up to date with lots of drysdae including:. In this potentiometer, the magnitude of the unknown voltage is measured from one scale, and its phase angle is directly on the second scale. Thus, the voltage and current may vary at different power factor.

Circuit Globe All about Electrical and Electronics. Related pages What is Potentiometer? Measurements of Self Reactant potentio,eter a Coil — The standard reactance is placed in series with the coil whose reactance is to be measured. Join our Mailing List by adding your email address below and be kept up to date with lots of information including: 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.

The main potentiometer current must be kept at some known constant value. Hence the value of the unknown emf is known.


Calibration of watt meter. Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 0.

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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 instrument. The indicator for low frequencies is a vibration galvanometer which must be closely tuned to resonate to the frequency of the circuit.

The potentiometer – is then thrown on to the A. Between the stators, there is laminated rotor having slots and winding which supplies voltage to the slide-wire circuit of the Potentiometer. Please be assured that any amount you feel able to donate will make an immediate and significant impact. The operation of the AC potentiometer is quite complicated as compared to the DC potentiometer. Arrangements are provided for reversing the ammeter in order to eliminate the effect of stray fields.

Drysdale’s Potfntiometer 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.

AC Potentiometer

Leave a Reply Cancel reply Your email address will porentiometer be published. Voltmeter Calibration — The AC potentiometer directly measures the low voltages up to 1. By doing some adjustments in sliding contacts and rheostat, the whole circuit gets balanced and galvanometer reads zero at the balanced condition.