DRYSDALE POTENTIOMETER PDF

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 working phenomenon of DC potentiometer and AC potentiometer is same. Circuit Globe All about Electrical and Electronics.

The operation of the AC potentiometer is quite srysdale as compared to the DC potentiometer. One is directly connected to power supply and the other one is connected in series with variable resistance and capacitor.

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.

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.

The phase shifting transformer is connected to the potentiometer to vary the phase drysdxle the voltage on the current. The indicator for low frequencies is a vibration galvanometer which must be closely tuned to resonate to the frequency of the circuit.

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AC Potentiometer

The known source may be DC or AC. Please be assured that any amount you feel able to donate will make an immediate and significant impact.

And when both of them are equal the galvanometer indicates the null point. Connects Facebook Youtube Videos. Polar potfntiometer Potentiometer In such type of instruments, two separate scales rdysdale used to measure magnitude and phase angle on some reference of the unknown e.

The potentiometer – is then thrown on to the A. Related pages What is Potentiometer?

AC Potentiometer

Calibration of watt meter. The working principle of the AC potentiometer is same as that of the DC potentiometer, i.

There is a provision on the scale that it could read potentlometer angle up to Measurements of Self Reactant of a Coil — The standard reactance is placed in series with the coil whose reactance is to be measured. 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.

AC Potentiometers

Voltmeter Calibration — The AC potentiometer directly measures the low voltages up to 1. Further references can be found at: The AC potentiometers are classified by the value measured by the potentiometer dial and scales. Between the stators, there is laminated rotor having slots and winding which supplies voltage to the slide-wire circuit of the Potentiometer. The phase-shifting transformer is usually supplied by single-phase current. The higher voltage is measured by either using the volt box ratio or two capacitors in series with the potentiometer.

There are two types of AC potentiometers: This ammeter must read correctly with alternating and continuous currents. This is accomplished by 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. Join our Mailing List by adding your email address below and be kept up to date with lots of information including: We are extremely grateful for the very kind donation from Rosemary Helme of this Drysdale Alternating and Continuous Current Potentiometer.

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Further, the phase relation between the circuit to be measured and that supplying the potentiometer may have any value from to Coordinate type Potentiometer In coordinate AC potentiometertwo separate potentiometers are caged in one circuit as shown in the figure.

It also supplies 6 volts to potentiometers. The AC potentiometer may be broadly classified as. The main potentiometer current must be kept at some known constant value. 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 reading of a sensitive dynamometer type ammeter in the main circuit is noted.

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Now to measure unknown e. Drysdale’s Alternating and Continuous Current Potentiometer. 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.