Electrical Measurements and Instrumentation

The book contains: Measuring Instruments: Classification Absolute and secondary instruments indicating instruments control balancing and damping constructional details characteristics errors in measurement Ammeters voltmeters: (DC/ AC) PMMC MI Electrodynamometer type Watt-meters: Electrodynamometer type induction type single phase and three phase watt-meter compensation Energy-meters: AC. Induction type single phase and three phase energy meter compensation creep error testing Frequency Meters: Vibrating reed type electrical resonance type. DC/ AC Bridges: General equations for bridge balance measurement of self inductance by Maxwell’s bridge (with variable inductance & variable capacitance) Hay’s bridge Owen’s bridge measurement of capacitance by Schearing bridge errors Wagner’s earthing device Kelvin’s double bridge. Transducer: Strain Gauges Thermistors Thermocouples Linear Variable Differential Transformer (LVDT) Capacitive Transducers Peizo-Electric transducers Optical Transducer Torque meters inductive torque transducers electric tachometers photo-electric tachometers Hall Effect Transducer.