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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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Moving coil Instruments – Dynamometer type instrument There are two types of Moving coil Instruments (i) Moving coil Instruments – permanent magnet moving Coil type (PMMC) which can be used …
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Moving coil Instruments – Permanent Magnet Moving Coil There are two types of Moving coil Instruments (i) Moving coil Instruments – permanent magnet moving Coil type (PMMC) which can be …
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Extension of Range by Shunts and Multipliers (i) As Ammeter : The Extension of range by shunts and multipliers of the moving-iron instrument, when used as an ammeter, can be …
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Moving Iron Instruments There are two basic forms of Moving Iron Instruments i.e. the attraction type and the repulsion type. The operation of the attraction type depends on the attraction of …
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