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ABB DO828 3BSE069055R1 Original ABB package
During the first part of the autotuning process, the output signal is kept constant and
the noise level is measured, in order to calculate the necessary oscillation amplitude.
Note that it is important to choose a shorter sampling time (task cycle time) for fast
processes than for slow processes, otherwise, the period used for noise calculation
will be unnecessarily long, autotuning will be less accurate, and the resulting control
will be unnecessarily slow. If the process is not stationary, the Autotuner will
interrupt and give a warning that the noise level is higher than the true level.
