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Understanding DC Circuits by Stephen Fardo, Dale Patrick

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Unit 5

Electronic Instruments

Electronic instruments of many types are in use today. They measure many different quantities. Instruments are used to measure electric quantities and other physical quantities. In unit 2, you learned to use a multimeter (VOM) to measure voltage, current, and resistance. These are basic electric quantities.

All instruments have common characteristics. A quantity is monitored either periodically or continuously. A visual display of the quantity must be presented. Several types of instruments are used for measuring electric quantities. The basic types of instruments may be classified as (1) analog instruments, (2) comparison instruments, (3) cathode-ray tube (CRT) instruments, (4) numerical readout instruments, and (5) ...

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