Electrical Instruments Library

Electrical Instrumentation Library

➣ Introduction
➣ Classification of Measuring Instruments 
➣ Essential Requirements of an instrument
➣ Deflecting System
➣ Controlling System
          Gravity Control
          Spring Control
          Comparison of Controlling Systems
➣ Damping System
         Air Friction Damping
         Fluid Friction Damping
          Eddy Current Damping
➣ D'Arsonval Galvanometr
          Construction
          Torque Equation
          Instrinsic Constants of Galvanometer
          Dynamic Behaviour of Galvanometer
➣ Permanent Magnet Moving Coil Instruments (PMMC)
          Torque Equation
          Advantages
          Disadvantages
          Taut Band Instrument
          Temperature Compensation
          Errors in PMMC Instrument
➣ Moving Iron Instruments
          Moving Iron Attraction Type Instruments
          Moving Iron Repulsion Type Instrument
          Radial Vane Repulsion Type Instrument
          Concentric Vane Repulsion Type Instrument
          Torque Equation of Moving Iron Instruments
          Advantages
          Disadvantages
          Errors in Moving Iron Instruments
➣ Electrodynamometer Type Instruments
          construction
          Torque Equation
          Advantages of Electrodynamic Instruments 
          Disadvantages of Electrodynamic Instruments 
          Errors in Electrodynamic Instruments 
➣ Basic D.C. Ammeter
➣ multirange ammeter
➣ The Ayrton Shunt or Universal Shunt
          Precautions to be taken while using an ammeter
➣ Requirements of a Shunt
➣ Basic D.C. Voltmeter
➣ Multirange Voltmeter
          Practicale Multirange Voltmeter
➣Sensitivity of Voltmeters
          Loading effect
          Precaution to be taken while using a voltmeter
          Requirements of a multipliers
➣ Ammeter and Voltmeter
➣ Ferrodynamic Instruments
➣ Electrothermic Instrument
          Classification of Electrothermic Instruments
➣ Hot Wire Instruments
          Construction and Operation of Hot Wire Instruments
          Derivation of Magnification Factor
          Advantages
          Disadvantages
➣ Thermocouple Instruments part 1 --- part 2
          Principle of operation
          Construction of Therrmocouple Instrument
          Heater Element
          Thermoelement
          Action in Thermocouple Instrument
          Advantages
          Disadvantages
➣ Electrostatic Instruments
          Principle of Operation
➣ Types of Electrostatic Voltmeters part1 --- part2
          Quadrant Type Electrostatic Voltmeter
          Heterostatic Connection
          Theory of Heterostatic Connection
           Idiostatic Connection
          Theory of Idiostatic Connection
          Kelvin Multicellular Voltmeter
➣ Attracted Disc Electrostatic Voltmeter
          Kelvin Absolute Electrometer
➣ Advantages and Disadvantages of Electrostatic Instruments
➣ Extension of Range of Electrostatic Instruments
          Resistance Potential Divider
          Capacitance Multipliers
➣ AC Voltmeter using Rectifiers
          First Rectifying and them Amplifying A.C. Signal
          First Rectifying and them Rectifying A.C. Signal
➣ Basic Rectifier Type A.C. Voltmeter
➣ A.C. Voltmeter Using Half Wave Rectifier
➣ A.C. Voltmeter Using Full Wave Rectifier
➣ Advantages of Rectifier Instruments
➣ Limitations of Rectifier Instruments