Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
Principles of Operation of Electrical Instruments
An electrical instrument essentially consists of a movable element and a scale to indicate or register the electrical quantity being measured. The movable element is supported on jewelled
PRINCIPLES OF OPERATION OF ELECTRICAL
INSTRUMENTS
An
electrical instrument essentially consists of a movable element and a scale to
indicate or register the electrical quantity being measured. The movable
element is supported on jewelled
Bearings
and carries a pointer or sets of dials. The movement of the movable element is
caused by utilizing one or more of the following effects of current or voltage:
1.
Magnetic effect-Moving-iron instruments
2.
Electrodynamics' effect- (i) Permanent-magnet moving coil (ii) Dynamometer type
3.
Electromagnetic-induction-Induction type instruments
4.
Thermal effect- Hot-wire instruments
5.
Chemical effect-Electrolytic instruments
6.
Electrostatic effect-Electrostatic instruments
Table
4.1. The principles of operation of electrical instruments are given in the
table for facility of reference.
Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation : Tag: : - Principles of Operation of Electrical Instruments
Electrical and Instrumentation Engineering: Unit IV: Measurements and Instrumentation
Under Subject
Electrical and Instrumentation Engineering
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