DRYSDALE POLAR A.C.POTENTIOMETER PDF
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 basic principle here is a.c.potentiommeter an unknown voltage by comparing it with known voltage. In order to obtain a balance, as indicated by the detecting instrument, it must be possible to give to the potentiometer current any phase displacement relative to that of the potential supplying it.
polar type ac potentiometer – Electrical Engineer
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 single range potentiometer can be modified to include a second measuring range of lower value by adding pllar range resistors and a range switch.
The AC potentiometer may be broadly classified as. It gives the oolar results in magnetic testing and precise testing of instrument transformers. The AC potentiometer is a.c.potrntiometer used for measuring the voltage which must be resolved into two components. The combination of dial resistors and slide wire is set to the polag of the standard cell voltage. The operation of the AC potentiometer is quite complicated as compared to the DC potentiometer. As balance is approached, the protective resistance is shorted and final adjustments are made to obtain a true balance condition.
The following are the steps to be followed during a potentiometric measurement:. S 1 and 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. These children deserve a space which is engaging and instructive, where they can feel a sense of adventure, exploration and surprise!
The value o the unknown voltage is read directly off the dial settings. The method of measuring unknown voltage E depends a.c.potentiometdr finding a position for the sliding contact such that the galvanometer shows zero deflection when galvanometer key K is closed. If the reading does not agree, a second measurement must be made, again returning to a a.c.potenttiometer check after completion.
The working current is checked by returning to the calibrate position.
As it is necessary to have the splitphase circuit somewhere near the resonating point, it must be a.c.potentio,eter for changes of frequency. The following are the steps to be followed during a potentiometric measurement: Drysdale for the measurement of alternating potentials.
Drysdael key and a protective resistance is used in the galvanometer resistance. The instrument is balanced by the main dial and the slide wire, leaving the protective resistance again in the circuit. To obtain the necessary field distribution a split-phase xrysdale is used, part of the excitation being provided by a circuit containing a condenser and a resistance in series.
In these instruments, the magnitude of the unknown voltage is read from one scale and its phase angle, with respect to some reference phasor, is read directly from a second scale.
Since opening at the end ofover 5, children have visited drysxale Centre. Precision laboratory potentiometers usually have three voltage ranges a high range 1.
Drysdale’s Alternating and Continuous Current Potentiometer – Computing History
Other Applications — The AC potentiometer is used for engineering measurement in which the accuracy of 0. Arrangements are provided for reversing the ammeter in order to eliminate the effect of stray fields.
Measures voltage as magnitude and phase from reference voltage.
Web Design by Pure Energy. The phase-shifting transformer is usually supplied by single-phase current. A.c.potentiojeter potentiometer – is then thrown on to the A. The known source may be DC or AC.
It also supplies 6 volts to potentiometers. The reading of a sensitive dynamometer type ammeter in the main circuit is noted. The switch is thrown to the calibrate position and the galvanometer key is tapped while the rheostat is adjusted for zero deflection on the galvanometer. This working current through the slide wire may be varied by changing the rheostat setting. drysvale
Drysdale ac polar potentiometer
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. 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.
Related pages What is Potentiometer? In this potentiometer, the magnitude dysdale the unknown voltage is measured from one scale, and its phase angle is directly on the second scale.
This ammeter must read correctly with alternating and continuous currents. The known voltage may be supplied by a standard cell or any other known voltage-reference source. Please be assured that any amount you feel able to donate will make an immediate and significant impact.
Drysdale’s Alternating polzr 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 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.
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When current start flowing from stators, the rotating field is developed around the rotor and pllar to it e. The indicator for low frequencies is a vibration galvanometer which must be closely tuned to resonate to the frequency of the circuit.