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And flipkart delivered me in 3 days very fast service. For Measurements and Instrumentation Subject, this book is very very useful. Great Author. Easy to understand. No other book can compete this book. Flipkart service is great. Vaitheeshwaran Alagappan Certified Buyer Jul, This book is good at first sight. It contains lot of topics. But there are full of mistakes which includes printing mistakes, conceptual mistakes, numerical mistakes.


The treatment and approach is not classy rather very basic and lengthy. Enlightenment on the construction of the instrument is also quite often pathetic. The book is certainly not worthy for a price of rs. There are a lot of printing mistakes and also it is very difficult to carry such a heavy book. Though all the topics are covered nicely. Faizhusein Arsiwala Jan, I am a student of IEE engg. And I love the MCQs at the end of each chapter. Really helpful to review your concepts. No proper description. Useless information.

Heavy book but no matter. You feel bore when you read this book,though you are interested in this subject Endurthi Venkatesh Reddy May, Book is very good and so is the company that supplied this book. But by mistake I bought 2 books. As per flipkart rules, i can't get the refund. That is the only problem. Viswanathan D Certified Buyer , Koothappar 2 months ago.

Have doubts regarding this product? This course is electronics based course dealing with measurements and instrumentation designed for students in Physics Electronics, Electrical and Electronics Engineering and allied disciplines. It is a theory course based on the use of electrical and electronics instruments for measurements.

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Electronic Measuring Instruments Tutorial

Like this presentation? Why not share! Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Manipal University Jaipur Follow. Published in: Engineering. Full Name Comment goes here. Are you sure you want to Yes No. Browse by Genre Available eBooks No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Electronic Measurement and Instrumentation 1. Temperature Measurement: Temperature and heat, Definitions, temperature scales, bimetallic thermometers, filled-bulb and glass stem thermometers, Resistance Temperature Detector RTD , principle and types, measuring circuits, Linear and Quadratic approximation Thermistors, Thermocouples, optical pyrometers, Pressure Measurement: Manometers, Elastic types, Bell gauges, Electrical types, Differential Pressure transmitters, Dead weight Pressure gauges, Low Pressure Measurement: Mc.

Leod gauge, Knudsen gauge, Pirani gauge, Thermal conductivity gauges, Ionization gauge. Wednesday, February 6, 4 Course Objective To provide students with a fundamental understanding of the concepts, principles, procedures and the computations used by engineers and technologies to analyse select, specify design and maintain modern instrumentation. Wednesday, February 6, 5 Course Summary This course is electronics based course dealing with measurements and instrumentation designed for students in Physics Electronics, Electrical and Electronics Engineering and allied disciplines.

Introduction Instrumentation : Instrumentation is the use of measuring instruments to monitor and control a process. It is the art and science of measurement and control of process variables within a production, laboratory, or manufacturing area.


Wednesday, February 6, 9 Few Definitions Wednesday, February 6, 10 Measurement: It is the act, or the result of quantitative comparison between a predetermined std. Since two quantities are compared and the result are expressed in numerical value. Measurand: The physical quantity or the characteristic conditions which is the object of measurement in an instrumentation system is termed as measurand or measurement variable or process variable. Fundamental Quantity: length, mass, time et.

Derived Quantity : Speed, Velocity, Pressure etc. Process of Comparison Std. Unknown Quantity Measurand Qty. This eventually leads to new discoveries that require new and sophisticated measuring techniques. Through measurement a product can be designed or a process be operated with max. Wednesday, February 6, 12 Measured Value: Any value or any reading calculated from measurement system or measuring instrument. True value: Any value calculated from rated value known as True value of Actual Value. Methods of Measurement Wednesday, February 6, 13 Direct Method Indirect Method The unknown quantity measurand In this method the comparison is directly compared against a standard.

These and a unit. Direct methods are common methods are used those cases for the measurement of physical quantities where the desire parameter to like length, mass and time be measured. Acceleration, power Method of Measurement Example: potentiometer Sensor VS transducer Wednesday, February 6, 15 Classification of Instruments Wednesday, February 6, 18 Measurement involve the use of instruments as a physical means of determining quantities or variables.

Ammeter, Voltmeter etc. Classification of Secondary Instruments Wednesday, February 6, 21 a Classification based on the various effects of electric current or voltage upon which their operation depend. Examples are ammeter, voltmeter, wattmeter etc. In principle, these are indicating instruments but so arranged that a permanent continuous record of the indication is made on a chart or dial Classification of Secondary Instruments Wednesday, February 6, 22 Integrating instruments: These instruments record the consumption of the total quantity of electricity, energy etc.

Examples are dc and ac bridges and potentiometers.

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They are used when a higher accuracy of measurements is desired Digital instruments: Signals varying in discrete steps and taking on a finite no. Deflecting torque Td : Deflecting torque causes the moving system and pointer of the instrument to move from its zero position. Production of deflecting torque depends upon the type of indicating instrument and its principle of operation 2.

Controlling torque Tc : Controlling torque limits the movement of pointer and ensures that the magnitude of deflection is unique and is always same for the given value of electrical quantity to be measured. Two methods of Controlling Torque i. Spring Control method ii. Gravity control method Damping Torque: Damping torque minimizes the oscillations of the pointer about the final steady state deflection and makes it steady.. In the absence of this torque, pointer continues oscillating to its final position after reaching to its final position.

Depending on the magnitude of damping, it can be classified as underdamped, over damped and critically damped Air Friction Damping Wednesday, February 6, 32 Fluid Friction Damping Wednesday, February 6, 33 Eddy Current Damping Wednesday, February 6, 34 Types of Instruments Wednesday, February 6, 35 1. Moving Iron type Instrument 3. Electro Dynamometer type Instrument 4. Hot wire type Instrument 5. Thermocouple type Instrument 6. Induction type Instrument 7. Electrostatic type Instrument 8. Rectifier type Instrument For spiral springs and strip suspensions, the controlling torque is directly proportional to the angle of deflection of the coil.

Numericals Wednesday, February 6, 43 1.

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A permanent magnet moving coil instrument has a coil of dimensions 15mm x 12 mm. The flux density in the air gap is 1. Determine the number of turns required to produce an angular deflection of 90 degrees when a current of 5mA is flowing through the coil. The coil of a moving coil voltmeter is 40mm long and 30mm wide and has turns on it. If the flux density of the magnetic field in the air gap is 1. The resistance of the voltmeter coil may be neglected. During switching there are actually two shunts in parallel with the instrument.

Ayrton or Universal Shunts Wednesday, February 6, 47 A basic meter resistance is 50 ohms and full scale deflection current is 10mA.

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Numerical Wednesday, February 6, 49 Multirange dc Voltmeter Wednesday, February 6, 51 A DC voltmeter can be converted into a multirange voltmeter by connecting a number of resistors multipliers in series with the meter movement. A practical multi-range DC voltmeter is shown in Figure It is determined by dividing the sum of the resistance of the meter Rm , plus the series resistance Rs , by the full-scale reading in volts.

In equation form, this is expressed as follows: When the meter is set on the mA range, the resistor Rb and Rc provide the shunt. The total shunt resistance is found by the equation. Moving Iron Attraction Type Instruments 1. Moving Iron Repulsion Type Instruments. Moving Iron Instruments Wednesday, February 6, 57 Torque Equation Wednesday, February 6, 59 Torque Equation Wednesday, February 6, 60 Errors Wednesday, February 6, 63 1. Hysteresis error : This error occurs as the value of flux density is different of same current for ascending and descending values.

The flux density is higher for descending value there for instruments read higher for descending value current this error can be minimize using small iron parts and other method is used nickel iron alloy 2. Temperature error: the effect of temperature change on moving iron instruments aries chiefly from the temperature coefficient of spring.

Electronic Measurement and Instrumentation

Stray Magnetic fields: It is a also called demagnetization fields. Frequency error: Change in frequency is also cause of change in reactance of working coil and also change the eddy currents setup in the metal parts of instrument. Reactance of Instruments coil: the change of reactance of the instrument coil is importance in case of voltmeter. Errors with both A. C and D. Electrodynamometer Instruments Wednesday, February 6, 66 Electrodynamometer Instruments Wednesday, February 6, 67 Torque Equation Wednesday, February 6, 68 Torque Equation Wednesday, February 6, 69 Torque Equation Wednesday, February 6, 70 They are also used as a transfer instruments.

Also it introduces increased frictional losses. To get accurate results, these errors must be minimized. Therefore can must be taken while handling them. Errors Wednesday, February 6, 73 1. Torque to weight ratio 2. Frequency errors 3. Eddy current errors currents. Stray magnetic field error :. Temperature error : Numericals Wednesday, February 6, 74 1.