Transcript
Measurement SystemsBlack box which is used for making measurements.In general, made up of three elementsSensor : responds to the quantity being measured by giving as its output a signal which is related to the quantity.Signal conditioner : takes signal from the sensor and converts it into condition which is suitable for either display or for use to exercise control.Display Sistem : output from the signal conditioner is displayed.
A Measurment System and Its Constituent ElementsSensor : Example ?Signal Conditioner : Example ?Display : Example ?
Open Loop Systems
Basic Elements of a Closed Loop Systems (1/2)
Basic Elements of a Closed Loop Systems (2/2)
The Automatic Control of Water Level (1/2)Controlled variable : water level in tankReference value : initial setting of the float and lever positionComparison element : the lever
The Automatic Control of Water Level (2/2)Error signal : the difference between the actual and initial settings of the lever positionsControl unit : the pivoted leverCorrection unit : the flap opening or closing the water supplyProcess : the water level in the tankMeasuring device : the floating ball and lever
Sequential ControllersWashing Machine System
Washing Machine System
Control SystemsBlack box which is used to control its output to some particular value or particular sequence of values.
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L.Hart
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