Principles of Electrical Measurements |
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accuracy adjustment alternating amount anode applied arms arrangement balance beam bridge calibrated capacitance carrying causes characteristics circuit coil compared compensation component connected constant construction convenient core damping deflection depends determined difference direct disc earth effect electrical electrode elements employed equal equation error example factor field fixed flux force frequency galvanometer give given grid Hence impedance increase indication inductance instrument known leads less limited load magnetic material means measured meter method movement moving mutual necessary negative obtained ohms operating oscillator phase plates position possible potential potentiometer power-factor practice primary principle proportional range ratio reading reduced represents resistance resonance scale screen secondary sensitivity shown in Fig shunt standard suitable supply switch takes temperature torque transformer turns units usually valve variable variation voltage voltmeter winding zero