Alternating Current Measurements at Audio and Radio Frequencies |
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a.c. potentiometer accuracy alternate adjustments alternating current alternating current potentiometer ammeter angle applied voltage balance was found C₁ C₂ calibration Carey Foster circuit co-ordinate type coil under test conditions of balance connected coupling coil crystal denote detector determination direct current effective resistance equal equation formula harmonic heterodyne wave-meter I₁ indicated induced e.m.f. inductive coil instrument L₂ LOW FREQUENCIES M₁ M₂ magnitude meter mica condenser microhenries mutual capacitance mutual inductance mutual inductometer non-inductive resistance null method obtained ohms parallel phase points potential divider power factor primary quartz oscillator quartz resonator quencies R₁ R₂ range reactance reading residual inductance resistance box resistance in series rotating vector secondary shown in Fig shunt skin effect slide wires standard condenser stray capacitance switch tance telephone terminals V₁ V₂ valve voltmeter variable air-condenser varying vector diagram vector impedance vibration galvanometer voltage volts Wheatstone bridge whence zero µµF