Hvacr Unit 33 Study Guide Rated A+

Before attempting to use an electric meter to measure the circuits on a system, the technician should: {Ans: Understand how the unit and the meter work.}How are clamp-on ammeters used? {Ans: They are clamped around one of the power wires feeding the circuit.}What three specifications help determine whether or not a particular meter is appropriate for a particular use? {Ans: Range, resolution, and accuracy}What category of electric meter is intended only for measurement inside an appliance? {Ans: Category I}Besides the normal electrical functions found on general-purpose multimeters, what additional functions are common on multifunction meters intended for HVACR use? {Ans: Temperature, microfarads, and frequency}What is the operating principle of an analog voltmeter? {Ans: Current passes through a coil, which creates magnetism that moves a needle.}