(adj.) Also spelled analogue, describes a device or system that represents changing values as continuously variable physical quantities. A typical analog device is a clock in which the hands move continuously around the face. Such a clock is capable of indicating every possible time of day. In contrast, a digital clock is capable of representing only a finite number of times (every tenth of a second, for example). In general, humans experience the world analogically. Vision, for example, is an analog experience because we perceive infinitely smooth gradations of shapes and colors.
When used in reference to data storage and transmission, analog format is that in which information is transmitted by modulating a continuous transmission signal, such as amplifying a signal's strength or varying its frequency to add or take away data. For example, telephones take sound vibrations and turn them into electrical vibrations of the same shape before they are transmitted over traditional telephone lines. Radio wave transmissions work in the same way. Computers, which handle data in digital form, require modems to turn signals from digital to analog before transmitting those signals over communication lines such as telephone lines that carry only analog signals. The signals are turned back into digital form (demodulated) at the receiving end so that the computer can process the data in its digital format.
Analog Multimeters
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Analog Devices Analog Switches
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Broad-line distributor web site features real-time stock status and pricing, online ordering, RFQ, technical support, product datasheets and photos.
Fiber-Optic Multiplexers
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National Semiconductor home page This home page offers links to company and product information, design engineer resources, news articles, information on environmental health and safety, and an annual report.
GlobalSpec.com: Ammeters
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Multimeters
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Stocking distributor of multimeters by Fluke, Extech, Amprobe, Ideal, Fieldpiece Instrument, UEI, TPI, and B&K Precision.
Hamamatsu: Fiber-Optic Multiplexers
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Develops and manufactures scientific imaging products, optics, lasers, and solid state and tube electronics including fiber-optic multiplexers.
MicroMo Electronics: Tachometers
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Specializes in the design, assembly and application of high precision, miniature DC drive systems, components, and motion control systems.
Analog and Digital Telephones
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