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The Ideal Electr1cal System
Electr1cal Measur1ng Instruments
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3-phase 5-ampere a-c voltmeter accuracy ammeter ampere-hour amperes artificial respiration belts binding posts burden calibrated cent chart checked circuit conductors connected current coils current ranges current transformers cycles determined device diagram direct current direct-current efficiency electrical measuring instruments electrical surveys electrodynamometer electrolysis employed equipment foot-candles frequency full load fuse indicating induction motor input instru instrument transformers lamp light load surveys losses low-voltage magnetic maximum measuring instruments Megger megohms ment method Milliammeter millivoltmeter Model Movable Iron multiplier necessary normal obtained ohmmeter ohms permanent-magnet moving-coil phase pointer polyphase wattmeter potential transformer power factor power-factor meters power-factor survey primary proper rated ratio reactance recording instruments scale secondary Section self-contained short-circuiting shown in Fig single-phase wattmeters Small Shoe Machines speed strument supply switch switchboard terminals thermocouple three-phase tion usually victim volt-amperes voltage drop voltage ranges voltage survey volts watthour meter wattmeter readings watts Wheatstone Bridge wire zero