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The Vibrating-reed Frequency Meter Working Principle – The Vibrating-reed Frequency Meter: The Vibrating-reed Frequency meter depends for its indication on the mechanical resonance of thin flat steel reeds arranged alongside …
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Vibration Galvanometer Vibration Galvanometers are widely used as null-point detectors in A.C. bridges. Construction of Vibration Galvanometers As shown in Figure A, it consists of a moving coil suspended between …
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Induction Type Wattmeters The two main types of wattmeters are The dynamometer or electrodynamic type wattmeter and the induction type wattmeters. Induction Type Wattmeters Principle of induction type wattmeters is …
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Dynamometer or Electrodynamic Type Wattmeter The two main types of wattmeters are The dynamometer or electrodynamic type wattmeter and the induction type wattmeter. Dynamometer or Electrodynamic Type Wattmeter The basic …
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Electrostatic Voltmeters Electrostatic instruments such as Electrostatic Voltmeters are almost always used as voltmeters and that too more as a laboratory rather than as industrial instruments. The underlying principle of …
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Induction Voltmeter Construction of Induction Voltmeter is similar to that of an induction ammeter except for the difference that its winding is wound with a large number of turns of fine …
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Induction Ammeters It has been shown in Article Induction type Voltmeters and Ammeters above that the net torque acting on the disc of Induction Ammeters is T = K2 ωΦ1m …
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Induction type Voltmeters and Ammeters Induction type Voltmeters and Ammeters (instruments) are used only for A.C. measurements and can be used either as ammeter, voltmeter or wattmeter. However, the induction …
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Insulation Tester (Megger) Insulation Tester (Megger) is a portable instrument used for testing the insulation resistance of a circuit and for measuring resistances of the order of megaohms which are …
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Thermocouple Ammeter The working principle of Thermocouple Ammeter is based on the Seebeck effect, which was discovered in 1821. A thermocouple, made of two dissimilar metals (usually bismuth and antimony) …
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