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Basic Instruments and Measurements Chapter 2 Basic Analog Meter • D’Arsonval movement – stationary magnet, moving coil galvanometer. • Iron Vane Meter – two pieces of iron are placed inside a hollow core solenoid. • Current causes magnetic field to move a needle. • Extreme caution and care when handling an analog meter. • Proper polarity must be maintained Meter Scales • Linear meter scale – marks are evenly spaced. • Note what range the dial of meter is set to when reading the value of the scale. Ammeter • Measures electrical current in a circuit. – Amperes – Milliamperes – Microamperes • Shunt is used to direct excess current away from meter. • Always connected in Series with the circuit. Voltmeter • Measures electrical voltage present in a circuit: – Volts – Millivolts • Connected in Parallel with the circuit Ohmmeters • Measures the resistance of a device or part of a circuit: – – – – Megaohms Ohms Milliohms Microhms • Zero the meter • Battery inside the case used to measure resistance. Other Meters • Volt – Ohm – Milliammeter (VOM) • Digital Multimeter (DMM) • Computer Display meters Electrical Diagrams • Schematics • Wiring Diagrams • Symbols (see page 453 – 454)