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Students those who are studying JNTUK R19 EEE Branch, Can Download Unit wise R19 2-2 Electrical Measurements & Instrumentation (EMI) Material/Notes PDFs below.

Preamble: This course introduces the principle of operation of basic analog and digital measuring instruments for measurement of current, voltage, power, energy etc. Measurement of resistance, inductance and capacitance by using bridge circuits will be discussed in detail. It is expected that student will be thorough with various measuring techniques that are required for an electrical engineer.

OBJECTIVES:

• To study the principle of operation and working of different types of instruments for measurement of Electrical Quantities.
• To study the working principle of operation of different types of instruments for measurement of power and power factor.
• To understand the principle of operation and working of various types of bridges for measurement of parameters –resistance, inductance, capacitance and frequency.
• To understand the principle of operation and working of transducers.
• To study the principle of operation and working of DVMS, Power analyser and applications of CRO.

UNIT-1

Analog Ammeter and Voltmeters Classification – deflecting, control and damping torques,– PMMC, moving iron type and electrostatic instruments, Construction, Torque equation, Range extension, Effect of temperature, Errors and compensations, advantages and disadvantages. Instrument transformers: Current Transformer and Potential Transformer-construction, theory, errors-Numerical Problems.

UNIT-2

Analog Wattmeters and Power Factor Meters Electrodynamometer type wattmeter (LPF and UPF), Power factor meters: Dynamometer and M.I type (Single phase and Three phase), construction, theory, torque equation, advantages and disadvantages -Numerical Problems.

UNIT-3

Measurements of Electrical parameters

DC Bridges: Method of measuring low, medium and high resistance – sensitivity of Wheat stone’s bridge, Kelvin’s double bridge for measuring low resistance, Loss of charge method for measurement of high resistance, Megger – measurement of earth resistance – Numerical Problems.

AC Bridges: Measurement of inductance – quality factor, Maxwell’s bridge, Hay’s bridge, Anderson’s bridge, measurement of capacitance and loss angle, Desauty’s bridge, Schering Bridge, Wagner’s earthing device, Wien’s bridge- Numerical Problems.

UNIT-4

Transducers Definition, Classification, Resistive, Inductive and Capacitive Transducer, LVDT, Strain Gauge, Thermistors, Thermocouples, Piezo electric and Photo Diode Transducers, Digital shaft encoders, Hall effect sensors- Numerical Problems.

UNIT-5

Digital meters Digital voltmeter – Successive approximation DVM, Ramp type DVM and Integrating type DVM – Digital frequency meter, Digital multimeter, Digital tachometer, Digital Energy Meter, LCR Q meter, Power Analyzer-Measurement of phase difference, Frequency, hysteresis loop using lissajious patterns in CRO- Numerical Problems.

TEXT BOOKS:

1. Electrical Measurements and measuring Instruments by E.W. Golding and F.C.Widdis, fifth Edition, Wheeler Publishing.
2. Modern Electronic Instrumentation and Measurement Techniques by A.D. Helfrick and W.D. Cooper, PHI, 5th Edition, 2002.

REFERENCE BOOKS:

1. Electrical & Electronic Measurement & Instruments by A.K.Sawhney Dhanpat Rai & Co.Publications.
2. Electrical and Electronic Measurements and instrumentation by R.K.Rajput, S.Chand.
3. Electrical Measurements by Buckingham and Price, Prentice – Hall
4. Electrical Measurements by Forest K. Harris. John Wiley and Sons
5. Electrical Measurements: Fundamentals, Concepts, Applications by Reissland, M.U, New Age International (P) Limited, Publishers.
6. Electrical and Electronic Measurements by G.K.Banerjee, PHI Learning Private Ltd, New Delhi–2012.

OUTCOMES:

• choose right type of instrument for measurement of ac and dc Electrical quantities.
• choose right type of instrument for measurement of power and power factor.
• select right type for measurement of R, L,C.
• understand the effectiveness of Transducer.
• able to understand Digital Meters.