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When the system is in steady state, and the Autotuner has been started, the PID
controller is temporarily disconnected.
First, the Autotuner measures the noise of the process value.
Secondly, the output is generated and changed by the relay, with a hysteresis
function, to implement a disturbance in the process, of a small amplitude, according
to the figure below. The effect of the relay function is an ON/OFF control which,