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The Art of Measurement
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accuracy adjustment air gap alternating current ammeter arrangement ballistic bridge calibration capacitance capacitor cell compensation connected constant construction copper decreases deflection detector determined dial direct current disc effect electrical electrode element emf's equal equation error field frequency friction function galvanometer harmonic heater hysteresis impedance increase indication inductor instrument insulation load magnetic circuit magnetizing force magnitude manganin material maximum measuring circuit mechanical ment meter method moving coil moving system mutual inductance ohms operating oscillograph parallel permeability phase angle plate pointer position potentiometer power factor precision primary quantity range ratio arms reactance reading reduced relative damping resistance resistor result scale secondary sensitivity shield shown in Fig shunt slide wire specimen standard switch temperature coefficient terminals test coil thermal thermocouple torque transformer tube units usually vector voltage circuit voltage drop voltmeter volts wattmeter Wheatstone bridge winding zero