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WHAT IS INSTRUMENTATION?
INSTRUMENT
A device or mechanism
To determine the value or magnitude of a quantity
ELECTRONIC INSTRUMENT
A device based on electrical principles
To measurement function
iNSTRUMENTATION SYSTEM
An assembly of various instruments and other component interconnected
To measure, analyze and control the electrical, thermal, hydraulic and other non-electrical physical quantities.
WHAT IS MEASUREMENT?
MEASUREMENT
The process of determining the amount, degree or capacity
By comparing with the accepted standards of the system.
STANDARD
The physical form of the unit of measurement
MEASURING INSTRUMENT
The devices used for comparing the unknown quantity.
MEASUREMENT METHOD
1) INDIRECT MEASUREMENT METHOD
2) DIRECT MEASUREMENT METHOD
INDIRECT MEASUREMENT METHOD
Determined by measuring other functionally related quantities an calculating the desired quantity.
DIRECT MEASUREMENT METHOD
Determined by directly compared against a standard.
DEFLECTION METHOD
COMPARISON METHOD
DIRECT MEASUREMENT METHOD
DEFLECTION METHOD
The value of unknown quantity is determined by means of measuring instrument having a scale graduated to the quantity under measurement directly.
COMPARISON METHOD
Comparison method can be divided into several method
Opposition method : the measured quantity act simultaneously on a comparison devices.
Difference method : the difference between quantities acts on a comparison device.
Null method : resultant effect of the comparison is zero.
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