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[[File:Digital Servo Controller.jpg|thumb|A modern digital test controller]]
[[Digital data|Digital]] [[Test method|test]] controllers are devices (usually [[computer]] based) that provide [[motion control]]<ref>{{cite book |last1= Ma |first1= Jun |last2= Li |first2= Xiaocong |last3= Tan |first3= Kok Kiong |date=2020 |chapter=1.1: Overview of Motion Control Systems |title= Advanced Optimization for Motion Control Systems|publisher= CRC Press, Taylor & Francis Group |___location=United States|page=1 |isbn=978-1000037111}} [https://books.google.com/books?id=UWXMDwAAQBAJ], ''[[Google Books]]'' Retrieved April 30, 2020.</ref> by processing digital signals. Typically a controller has inputs connected to [[sensors]] on the device they control, which measure the [[feedback]], its current state (for example the current position), and process this signal to provide an output to a hydraulical, electrical or other type of [[servomechanism]] control of the controlled device, with the aim of matching a control signal.
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