Posts tagged tune

Lag vs MA filter

Most systems to be controlled have unwanted noise superimposed on the “real” measurement value, especially in the process industries. As a result, measurement (or PV) filtering is an important part of control scheme design. In the process industries it is common to use either a Moving-Average or MA filter or a first-order “Lag” filter within the control loop when the noise level is too high. But which one is the most effective at reducing noise without reducing loop performance?

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