ELECTRICAL MEASUREMENTS AND INSTRUMENTATION-JNTUK-R19 AND R20 SYLLABUS
UNIT–I:
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 –II:
Analog Wattmeters and Power Factor Meters
Electrodynamometer type wattmeter (LPF and UPF), Power factor meters: Dynamometer and
- type (Single phase and Three phase), construction, theory, torque equation, advantages and disadvantages -Numerical Problems.
UNIT – III:
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 – IV:
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 – V:
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.
Learning Outcomes:
After the completion of the course the student should be able to:
- 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.
Text Books:
- Electrical Measurements and measuring Instruments by E.W. Golding and F.C.Widdis, fifth Edition, Wheeler Publishing.
- Modern Electronic Instrumentation and Measurement Techniques by A.D. Helfrick and
W.D. Cooper, PHI, 5th Edition, 2002.
Reference Books:
- Electrical & Electronic Measurement & Instruments by A.K.Sawhney Dhanpat Rai & Co.Publications.
- Electrical and Electronic Measurements and instrumentation by R.K.Rajput, S.Chand.
- Electrical Measurements by Buckingham and Price, Prentice – Hall
- Electrical Measurements by Forest K. Harris. John Wiley and Sons
- Electrical Measurements: Fundamentals, Concepts, Applications by Reissland, M.U, New Age International (P) Limited, Publishers.
- Electrical and Electronic Measurements by G.K.Banerjee, PHI Learning Private Ltd, New Delhi–2012.