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The signal applied to the device that makes corrective changes in a controlled process or machine.



Related Terms

FEED

  1. To supply a signal to the input of a circuit, transmission line, or antenna. 2. Process or act of supplying material to a processing unit for treatment. 3. The material supplied to a processing unit for treatment. 3. A device that moves stock or workpieces to, in, or from a die. 4. Forward motion imparted to the cutters or drills of cutting or drilling machinery.

AUDIBLE LEAK DETECTOR

A device used as an auxiliary to the main leak detector for conversion of the output signal into audible sound.

INJECTION

  1. The method of applying a signal to an electronic circuit or device. 2. The process of introducing electrons or holes into a semiconductor so that their total number exceeds the number present at thermal equilibrium. 3. The introduction of fuel, fuel and air, fuel and oxidizer, water, or other substance into an engine induction system or combustion chamber.

RACON

As defined by the International Telecommunication Union (ITU), in the maritime radionavigation service, a receiver-transmitter device which, when triggered by a surface search radar, automatically returns a distinctive signal which can appear on the display of the triggering radar, providing range, bearing and identification information. Also called RADAR TRANSPONDER BEACON.

FORMING

  1. Application of voltage to an electrolytic capacitor, electrolytic rectifier, or semiconductor device to produce a desired permanent change in electrical characteristics as a part of the manufacturing process. 2. A process for shaping or molding sheets, rods, or other pieces of hot glass, ceramic ware, plastic, or metal by the application of pressure.

CONTACTOR CONTROL SYSTEM

A feedback control system in which the control signal is a discontinuous function of the sensed error and may therefore assume one of a limited number of discrete values.

ELECTROCHEMICAL TRANSDUCER

A device which uses a chemical change to measure the input parameter; the output is a varying electrical signal proportional to the measurand.

MULTIPLEXER

A device for combining two or more signals, as for multiplex, or for creating the composite color video signal from its components in color television. Also spelled multiplexor.

FEEDFORWARD CONTROL

Process control in which changes are detected at the process input and an anticipating correction signal is applied before process output is affected.

ACTUATOR

  1. A mechanism to activate process control equipment by use of pneumatic, hydraulic, or electronic signals; for example, a valve actuator for opening or closing a valve to control the rate of fluid flow. 2. An auxiliary external electrode used to apply a known electrostatic force to the diaphragm of a microphone for calibration purposes. Also known as electrostatic actuator. 3. A device that produces mechanical force by means of pressurized fluid.

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