![]() ![]() It also supplies 6 volts to potentiometers. 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. 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. By adjusting rheostat R and R’ and sliding contacts, the current in the quadrature potentiometer becomes equal to the current in the in-phase potentiometer and a variable galvanometer shows the null value. the sliding contact AA’ in the in-phase potentiometer and BB’ in quadrature potentiometer are used for obtaining the desired current in the circuit. and the other one is named as quadrature potentiometer which measures quadrature part of the unknown e.m.f. ![]() The first one is named as the in-phase potentiometer which is used to measure the in-phase factor of an unknown e.m.f. Cromptons potentiometer standardization Measurement of unknown resistance. In coordinate AC potentiometer, two separate potentiometers are caged in one circuit as shown in the figure. Potentiometers & Instrument transformers: Principle and operation of D.C. You can go study similar questions to the one above in our electrical engineering MCQs. ![]()
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