Measuring Instruments Classification - Deflecting, Control and damping torques - Ammeters and Voltmeters - PMMC, Moving iron type instruments - Expression for the deflecting torque and control torque - Errors and compensations, Extension of range using shunts and series resistance. Electrostatic voltmeters - electrometer type and attracted disc type - Extension of range of E.S. voltmeters.Instrument Transformers CT and PT - Ratio and phase angle errors - Design considerations, Type of P.F. meters - Dynamometer and moving iron type-1-ph and 3-ph meters - Frequency meters - Resonance type and Weston type - Synchroscopes.Measurement of Power Single phase dynamometer wattmeter, LPF and UPF, Double elements and three element dynamometer wattmeter, Expression for deflecting and control torques - Extension of range of wattmeter using instrument transformers - Measurement active and reactive powers in balanced and unbalanced systems.Measurement of Energy Single phase induction type energy meter - Driving and braking torques - Errors and compensations - Testing by phantom loading using R.S.S. meter. Three phase energy meter - Invector meter, Maximum demand meters.Potentiometers Principle and operation of D.C. Crompton's potentiometer - Standardization - Measurement of unknown resistance, Current, Voltage.A.C. Potentiometers : Polar and co-ordinate types standardization - Applications.Resistance Measurements Method of measuring low, Medium and high resistance - Sensitivity of Wheatstone's bridge - Carey-Foster's bridge, Kelvin's double bridge for measuring low resistance, Measurement of high resistance - Loss of charge method.A.C. Bridges Measurement of inductance, Quality factor - Maxwell's bridge, Hay's bridge, Anderson's bridge, Owen's bridge. Measurement of capacitance and loss angle - Desauty bridge, Wien's bridge, Schering bridge.Magnetic Measurements Ballistic galvanometer - Equation of motion - Fluxmeter - Constructional details, Comparison with ballistic galvanometer. Determination of B.H. Loop methods of reversals six point method - A.C. testing - Iron loss of bar samples - Core loss measurements by bridges and potentiometers.
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