Signal Conditioning & PC-Based Data Acquisition Handbook

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Chapter 3: Multiplexing
A multiplexer is a switch that allows a single ADC to measure many input channels. This switch can be implemented via relays or solid-state switches. A relay is a mechanical switch, so rates are relatively slow (less than 1 kHz for reed relays, which are the fastest type), but large voltages and high isolation (several kV) can be achieved. The current capacity of a relay is determined by its size and contact type. Currents of 3A are typical in relays used in laboratory instruments. Much larger currents can be switched with the larger relays common in industrial applications. Download this chapter to read on...

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