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hysteresis band is often used to minimize relay chatter. A wide hysteresis band can be used for
on-off control applications.
A deviation band alarm controls relay action symmetrically around a setpoint. The relay
actuates when the reading falls within the deviation band, and de-actuates when the reading
falls outside. A deviation value (such as 50 counts) is set up around both sides of the setpoint
to create the deviation band. Passbands around a setpoint are often used for component
testing.
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