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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This ammeter must read correctly with alternating and continuous currents. Circuit Globe All about Electrical and Electronics.

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Drysdale’s Alternating and Continuous Current Potentiometer – Computing History

Further references can be found at: The main circuit of the dryedale must a.c.pottentiometer 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.

Calibration of watt meter. 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.

Since the potentiometer is a d. Drysdale for the measurement of alternating potentials. Join our Mailing List by adding your email address below and be kept up to date with lots of information including:. As it is necessary to have the splitphase circuit somewhere near the resonating point, it must be adjusted pokar changes of frequency.


The value o the unknown voltage is read directly off the dial settings. The working phenomenon of DC potentiometer and AC potentiometer is same. It also supplies 6 volts to potentiometers. The operation of the AC potentiometer is quite complicated as compared to the DC potentiometer. The known source may be DC or AC.

If the reading does not agree, a second measurement must be made, again returning to a calibration check after completion.

Further, the phase relation between the circuit to be measured and that supplying the potentiometer may have any value from to The following are the steps to be followed during a potentiometric a.c.pktentiometer. After the standardization has been completed the switch is thrown to the operate position, thus connecting the unknown e.

The potentiometer – is then thrown on to drysdael A. 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.

AC Potentiometers

C potentiometer is an accurate and versatile instrument and thus it is obvious that the potentiometer principle can be applied to measurement of alternating currents and voltages. Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 0.

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. The protective resistance is left in the circuit to avoid damage to the galvanometer during the initial stages of adjustment.


S 1 a.c.potentiometer S 2 are signs changing switches which are used to change the polarity of the test voltage if it is required for balancing the Potentiometer. The instrument comprises the standard Tinsley DC potentiometer of the time, with a phase shifter, Weston dynamometer voltmeter, selection and a.c.potentiometerr switches and terminal panels for connection of galvanometers, DC and AC measuring and supply voltages.

Arrangements are provided for reversing the ammeter in order to eliminate the effect of stray fields. Leave a Reply Cancel reply Your email address will not be published. The phase-shifting transformer is usually supplied by single-phase current.

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Now the in-phase component V A of the unknown e. In order to obtain a balance, as indicated by the a.c.potentiommeter instrument, it must be possible to give to the potentiometer current any phase displacement relative to that of the potential supplying it. The basic principle here is measuring an unknown voltage by comparing it with known voltage.

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