Signal Conditioning & PC-Based Data Acquisition Handbook

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Chapter 8: Digital & Pulse-Train Conditioning
Many applications entail interfacing digital signals to a computer. Digital signals differ from analog signals in that digital signals represent a discrete state, whereas analog signals represent continuous values. Digital signals are termed discrete because a digital line is either low or high. As such, a digital signal represents Boolean values such as off or on, zero or one. Accordingly, each digital line can serve as a single bit in the representation of a number or character. Digital output lines commonly control relays to power-on or power-off equipment or indicators. Digital input lines can represent the state of a switch indicating position or status. Digital I/O lines may also be used to communicate between instruments. Download this chapter to read on...

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