Signal Conditioning & PC-Based Data Acquisition Handbook
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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