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A signal obtained by comparing the output of a control system with the input, which is used to diminish the difference between them.



Related Terms

MEAN-SQUARE-ERROR CRITERION

Evaluation of the performance of a control system by calculating the square root of the average over time of the square of the difference between the actual output and the output that is desired.

FEEDBACK CIRCUIT

A circuit that returns a portion of the output signal of an electronic circuit or control system to the input of the circuit or system.

AUTOMATIC-CONTROL TRANSIENT ANALYSIS

The analysis of the behavior of the output variable of an automatic control system as the system changes from one steady-state condition to another in terms of such quantities as maximum overshoot, rise time, and response time.

NONLINEAR FEEDBACK CONTROL SYSTEM

Feedback control system in which the relationships between the pertinent measures of the system input and output signals cannot be adequately described by linear means.

AUTOMATIC-CONTROL FREQUENCY RESPONSE

The steady-state output of an automatic control system for sinusoidal inputs of varying frequency.

LOOP GAIN

  1. The ratio of the magnitude of the primary feedback signal in a feedback control system to the magnitude of the actuating signal. 2. Total usable power gain of a carrier terminal or two-wire repeater; maximum usable gain is determined by, and may not exceed, the losses in the closed path.

DEAD TIME

  1. The time interval between a change in the input signal to a process control system and the response to the signal.
  2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.

COMPUTER-CONTROLLED SYSTEM

A feedback control system in which a computer operates on both the input signal and the feedback signal to effect control.

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.

OBSERVATION SPILLOVER

The part of the sensor output of an active control system caused by modes that have been omited from the control algorithm in the process of model reduction.

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