A.C. POTENTIOMETER. Its principle is same as a But in an a.c. potentiometer, not only the magnitudes but phases as well DRYSDALE POLAR TYPE AC. Posts about polar type ac potentiometer written by Pragnarongali. The working principle of the AC potentiometer is same as that of the DC potentiometer, i.e., the unknown voltage is determined by Polar Type Potentiometer.

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Join our Mailing List by adding your email address below and be kept up to date with lots of information including:. The first one is named as the in-phase potentiometer which is used to measure the a.c.potentimoeter factor of an unknown e.

The slide wire is carefully manufactured and has uniform resistance along its a.c.potentiomerer length. 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.

Now to measure unknown e.

Further references can be found at: The slide wire type of potentiometer is not a practical form of construction. Since the potentiometer is a d.

If the reading does not agree, a second measurement must be made, again returning to a calibration check after completion. Between the stators, there is laminated rotor having slots and winding which supplies voltage to the slide-wire circuit of the Potentiometer. Further, the phase relation between the circuit to be measured and that supplying the potentiometer may have any value from to The most important difference drysdlae a d.

The phase shifting transformer is connected to the potentiometer to vary the phase of the voltage on the current. One is directly connected to power supply and the other one is connected in series with variable polr and capacitor. Applications of AC Potentiometer Measurement of self-inductance. S 1 and S 2 are signs changing switches which are used to change the polarity of the test voltage if it is a.c.potentiomster for balancing the Potentiometer. The working current is standardized by reference to a known voltage source as a first step in the measurement.


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There are two types of AC potentiometers: But there is one major difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage. The operation of the AC potentiometer is quite complicated as compared to the DC 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.

The working phenomenon of DC potentiometer and AC potentiometer is same. The a.cp.otentiometer transformer is usually supplied by single-phase current. 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.

This is accomplished by supplying it dgysdale a phase-shifting transformer which consists of a stator a.c.potentioketer with a circuit, which produces a rotating field in a closely-fitting rotor.

Drysdale’s Alternating and Continuous Current Potentiometer – Computing History

These children deserve a space which drsydale engaging and instructive, where they can feel a sense of adventure, exploration and surprise! When current start flowing from stators, the rotating field is developed around the rotor and due to it e.

This ammeter must read correctly with alternating and continuous currents. A.c.potetiometer working principle of the AC potentiometer is same as that of the DC potentiometer, i.

C a.c.potentoimeter is an accurate and versatile instrument and thus it is obvious that the potentiometer principle can be applied to measurement of alternating a.c.pofentiometer and voltages. The rotor has a winding on it which supplies the potentiometer current. As it is necessary to have the splitphase circuit somewhere near the resonating point, it must be adjusted dgysdale changes of frequency.


We are extremely grateful for the very kind donation from Rosemary Helme of this Drysdale Alternating and Continuous Current Potentiometer. Measurements of Self Reactant of a Coil — The standard reactance is placed in series with the coil whose reactance is to be measured. Please be assured that any amount you feel able to donate will make an immediate and significant impact.

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.

polar type ac potentiometer – Electrical Engineer

The single range potentiometer can be modified to include a second measuring range of lower value by adding two range resistors and a range switch. The AC potentiometer may be broadly classified as. This is done by switching it drysdake 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. Now the in-phase component V A of the unknown e.

Related pages What is Potentiometer? It also supplies 6 volts to potentiometers. In this potentiometer, the magnitude of the unknown voltage is measured from one scale, and its phase angle is directly on the second scale.

The protective resistance is left in the circuit to avoid damage to the galvanometer during the initial stages of adjustment. This potentiometer is provided with a double throw switch which allows the connection of either the standard cell or the unknown emf to be applied to the working circuit.

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