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Manufacturing Technology: Theory and Problems, Second Edition by D. K. Singh

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CHAPTER 14

Metrology

  • Metrology is the science of measurement.
  • SI (International Standard) unit is universally accepted. It is also called metric units of standard. There are seven basic and two supplementary SI units. They are shown in Tables 14.1 and 14.2, respectively.

     

    Table 14.1 Basic units

    Quantity Unit Symbol
    Length Metre
    m
    Mass Kilogram
    kg
    Time Second
    s
    Electric current Ampere
    A
    Temperature Kelvin
    K
    Luminous Intensity Candela
    cd
    Amount of substance Mole
    mol

     

    Table 14.2 Supplementary units

    Quantity Unit Symbol
    Plane angle Radian
    rad
    Solid angle Steradian
    sr
  • The important characteristics of a measuring instrument are: accuracy, sensitivity and repeatability.
  • There are six degrees of freedom: three linear ...

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