Basic Instruments and Measurements

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Presentation transcript:

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)