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EI2511 Meaurements & Instrumentation 22-08-2016 Unit 1 Lecture Handouts - Prepared By K.Karthikeyan 1 EI2511 - MEASUREMENTS & INSTRUMENTATION UNIT I - BASIC BASIC BASIC MEASUREMENT CONCEPTS MEASUREMENT CONCEPTS UNIT I BASIC MEASUREMENT BASIC MEASUREMENT CONCEPTS CONCEPTS ° Measurement systems ° Static and dynamic characteristics ° Units and standards of measurements ° Error analysis ° Moving coil ° Moving iron meters ° Multimeter - true RMS meters ° Bridge measurements ° Maxwell, hay, Schering and Wien bridge. M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 2 22-08-2016 Measurement ° Measurement of a given quantity is essentially an act or result of comparison between the quantity (whose magnitude is unknown) and predetermined or predefined standards. ° Two quantities are compared the result is expressed in numerical values. M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 3 22-08-2016 History of Measurement History of Measurement Standardized weights from the Indus river valley M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 4 22-08-2016
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EI2511 Meaurements & Instrumentation 22-08-2016 Unit 1 Lecture Handouts - Prepared By K.Karthikeyan 2 History of Measurement History of Measurement A bronze ruler from the Han dynasty in China M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 5 22-08-2016 History of Measurement History of Measurement History of Measurement History of Measurement Ancient Greek measurement using hand span and foot M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 6 22-08-2016 History of Measurement The measure for the weight of the precious stones, such as diamond, carat is used. Carat was the weight of four carob (Ke ç iboynuzu) beans. M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 7 22-08-2016 Basic requirements for a Basic requirements for a meaningful measurement ° The standard used for comparison purposes must be accurately defined and should be commonly accepted. ° The apparatus used and the method adopted must be provable (verifiable). M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 8 22-08-2016
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EI2511 Meaurements & Instrumentation 22-08-2016 Unit 1 Lecture Handouts - Prepared By K.Karthikeyan 3 Basic requirements for a meaningful measurement meaningful measurement M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 9 22-08-2016 Basic requirements for a meaningful measurement meaningful measurement M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 10 22-08-2016 Significance of Significance of Measurement Measurement ° Importance of Measurement is simply and eloquently expressed in the following statement of famous physicist Lord Kelvin: ° ”I often say that when you can measure what you are speaking about and can express it in numbers, you know something about it; when you cannot express in it numbers your knowledge is of meager and unsatisfactory kind” M & I – UNIT 1 - BASIC MEASUREMENT CONCEPTS 11 22-08-2016 Lord Kelvin Methods of Measurement ° Direct Methods ° Indirect Methods ± DIRECT METHODS: In these methods, the unknown quantity (called the measurand ) is directly compared against a standard.
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