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ELECTRICAL MEASUREMENTS


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UNIT I MEASUREMENT OF VOLTAGE AND CURRENT 9

Galvanometers – Ballistic, D’Arsonval galvanometer – Theory, Calibration and applications –Construction, Operation and Comparison of moving coil and moving iron meters – Dynamometer instruments – Induction type and thermal type meter – Rectifier type – Extension of range of voltmeter and ammeter – Errors and compensation.

UNIT II MEASUREMENT OF POWER AND ENERGY 9

Electrodynamometer type wattmeter – Theory – Errors – Methods of correction – LPF wattmeter – Phantom loading – Induction type kWh meter – Induction type energy meter – Calibration of wattmeter.

UNIT III POTENTIOMETERS AND INSTRUMENT TRANSFORMERS 9
D.C potentiometer – Basic circuit – Standardization – Laboratory type (Crompton’s) – A.C potentiometer – Drysdale (polar type) type – Gall-Tinsley (coordinate) type – Limitations – Applications – C.T and P.T construction – Theory – Operation and characteristics.

UNIT IV RESISTANCE MEASUREMENT 9

Measurement of low, medium and high resistance – Ammeter-voltmeter method – Wheatstone bridge – Kelvin double bridge – Series and shunt type ohmmeter – High resistance measurement – Megger – Direct deflection methods – Price’s guard-wire method – Earth resistance measurement.

UNIT V IMPEDANCE MEASUREMENT 9

A.C bridges – Measurement of inductance, capacitance – Q of coil – Maxwell Bridge – Wein’s bridge – Schering bridge – Anderson bridge – Campbell bridge to measure mutual inductance – Errors in A.C. bridge methods and their compensation – Detectors – Excited field – A.C. galvanometer – Vibration galvanometer

L: 45 T: 15 Total: 60

TEXT BOOKS
1. E.W.Golding, F.C.Widdis, “Electrical Measurements & Measuring Instruments”, A.H.Wheeler & Co, 2001

2. A.K. Sawhney, “Electrical & Electronic Measurements and Instrumentation”, Dhanpat Rai & Co, 2004

REFERENCES
1. J.B.Gupta, “A Course in Electronic and Electrical Measurements and Instrumentation”, S.K. Kataria & Sons, Delhi, 2003.

2. S.K.Singh, “Industrial Instrumentation and control”, Tata McGraw Hill, 2nd Edition, 2002

3. H.S.Kalsi, “Electronic Instrumentation”, Tata McGraw Hill, 2004

4. Martin U. Reissland, “Electrical Measurement-Fundamental Concepts and Applications”, New Age International, 2001


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