ENGINEERING METROLOGY Hand wriiten Notes for Unit-1 & 2

UNIT I BASIC CONCEPTS AND COMPARATORS
Basic concept – Legal metrology – Precision – Accuracy – Types of errors – standards of
measurement – traceability – interchangeability and selective assembly, gauge blocks, limit
gauges – tailors principle of gauge design. Comparators: Mechanical, Electronic, optical and
Pneumatic – Automatic gauging.
UNIT II ANGULAR MEASUREMENT AND SURFACE FINISH MEASUREMENT
Angular measurement : sine bar – Autocollimator, optical projectors: profile projectors –
toolmakers microscope, measurement of surface finish: Terminology – roughness – waviness –
analysis of surface finish – stylus probe instrument –Talysurf.

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ENGINEERING METROLOGY and MEASUREMENTS - Unit 1 - 2 marks

UNIT I- Concept Of Measurment
1. What is Range of measurement?:
The physical variables that are measured between two values. One is the higher calibration value
H , and the other is Lower value L, The difference between H, and L, is called range.
2. . What is Resolution:
The minimum value of the input signal is required to cause an appreciable change in the output known
as resolution.
3. Differentiate between sensitivity and range with suitable example.
Example: A Instrument have a scale reading of 0.01mm to 100mm.
Here, the sensitivity of the instrument is 0.0lmm i.e. the minimum value in the scale by which
the instrument can read. The range is 0.01 to 100mm i.e. the minimum to maximum value by which
the instrument can read.

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