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Basic Instruments and Measurements
Chapter 2
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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
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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.
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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.
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Voltmeter Measures electrical voltage present in a circuit:
Volts Millivolts Connected in Parallel with the circuit
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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.
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Other Meters Volt – Ohm – Milliammeter (VOM) Digital Multimeter (DMM)
Computer Display meters
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Electrical Diagrams Schematics Wiring Diagrams
Symbols (see page 453 – 454)
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