Engineering Metrology & Measurement

1) For Plane angle: Radian (rad) 2) For Solid angle: Steradian (sr)

1) For Length :   Metre (m) which is equal to 1650763.73 wavelengths in vacuum of the red- orange radiation corresponding to the transition between the levels 2p10 & 5d5 of the krypton-86 atom. (Definition by wavelength standard) By Line standard, Metre is the distance between the axes of two lines engraved on a polished surface of…

The generalized measuring systems consist of the following common elements: 1. Primary sensing element 2. Variable conversion element 3. Variable manipulation element 4. Data transmission element 5. Data processing element 6. Data presentation element

1)  Method of direct measurement:   The value of the quantity to be measured is obtained directly without the necessity of carrying out supplementary calculations based on a functional dependence of the quantity to be  measured  in  relation to  the quantities actually  measured. Example:  Weight of a substance is measured directly using a physical balance. 2)  Method of indirect…

To ensure that the part to be measured conforms to the established standard.   To meet the interchangeability of manufacture.   To provide customer satisfaction by ensuring that no faulty product reaches the customers.   To coordinate the functions of quality control,   production,   procurement   & other   Departments of the organization.   To judge the…

Sensitivity: Sensitivity of the instrument is defined as the ratio of the magnitude of the output signal to the magnitude of the input signal. It  denotes  the  smallest  change  in  the  measured  variable  to  which  the  instruments responds. Sensitivity has no unique unit. It has wide range of the units which dependent up on the…