Measurement System

MEASUREMENT SYSTEM

A measurement system can be defined as a black box which is used for makingmeasurements. It has the input as the quantity being measured and the output as a measured value of that quantity.

Example:

Elements of Measurement Systems:

Measurement system consists of the following three elements.

a) Sensor            b) Signal conditioner    c) Display System

Sensor:

A sensor consists of transducer whose function is to convert the one form of energy into electrical form of energy. A sensor is a sensing element of measurement system that converts the input quantity being measured into an output signal which is related to the quantity

Example:

Temperature Sensor    – Thermocouple

Input                           – Temperature

Output                        – E.M.F (Electrical Parameter).

Signal Conditioner:

A signal conditioner receives signal from the sensor and manipulates it into a suitable condition for display. The signal conditioner performs filtering, amplification or other signal conditioning on the sensor output.

Example:

Temperature measurement    – Single Conditioner function (Amplifier)

Input                                     – Small E.M.F value (From sensor)

Output                                   – Big E.M.F Value (Amplified).

Display System:

A display system displays the data (output) from the signal conditioner by analog or digital. A digital system is a temporary store such as recorder.

Example:             

Display       –  L.E.D  (or)  Number  on  scale  by  pointer  movement

Input – Conditioned Signal (from signal conditioner)

Output        – Value of the quantity (Temperature)