Electrical Measuring Instruments: Measurement and Surveys |
Contents
PORTABLE INSTRUMENTS | 29 |
INSTRUMENT TRANSFORMERS | 31 |
Typical Standard Portable SinglePhase Wattmeters | 44 |
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3-PHASE 4-WIRE CIRCUIT 5-ampere a-c ammeter a-c voltmeters accuracy Adjustment alternating current ampere-hours amperes AMPS binding posts burden calibrated cent chart conductors connected current coil current ranges current transformers cyclometer d-c instruments determined direct current direct-current disc electrical measuring instruments electrodynamometer Electrolysis employed equipment errors external shunts Frequency Meter ground resistance impedance indicating induction instru instrument transformers KILOWATT HOURS lamps load survey magnetic maximum Megger megohms ment milliamperes millivoltmeter Model motor Movable Iron multiplier obtained ohmmeter ohms operating permanent-magnet moving-coil PHASE B PHASE phase rotation plant pointer polyphase wattmeter potential coils potential transformer ratio power factor primary rated reactance Read voltage recording instruments resistors scale secondary self-contained shown in Fig shunt single-phase wattmeters speed struments supply switch synchronism Tachometer Tester thermocouple three-phase three-wire tion trans volt-amperes voltage drop voltage range voltage survey volts watthour meter wattmeter readings watts WESTON Wheatstone Bridge wire zero ΙΟ