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TOOLS AND EQUIPMENT
PART TWO AC VOLTMETERS
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accuracy air gap alternating current aluminum ammeter amperes assembly calibration adjustments cause changes chapter circuit clearance connections correct current coils current flow cycles damping chamber damping vane defects dial direct current disk effects electrical instruments electrodynamic type electromagnet element shaft end play errors external friction indicate induction type inspection instru insulation iron vane jewel bearings lead loose magnetic field manufacturer measured mechanical ment mounted moving coil moving element moving-iron type ohmmeter Permo phase pivot point pivots and bearings pivots and jewels pointer polarity polyphase position power factor meter Principle of Operation reactance reactive reactor removed repair resistance resistor resistor-reactor result rotating sapphire scale series resistors shifting shown in Fig shunt single-phase solder standard stationary coils steel pivots strument sub-base switchboard synchroscope tachometer temperature terminals thermocouple three-phase tion torque type frequency meter type instrument type power factor vibration volt-amperes voltage voltmeter volts wattmeter wire zero