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What is the instrument used to measure the speed of motor? how it is used?

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Question added by Saboora Naushad , Technical & administrative support Clerk , Commercial Taxes Department, Government of Kerala, India
Date Posted: 2014/10/03
Azarudeen Allimoopan Uduman Mohideen
by Azarudeen Allimoopan Uduman Mohideen , Assistant Manager - Electrical , Coastal Energen Pvt Ltd

now digital speed sensor used

JAYDEEP K R
by JAYDEEP K R , Project Engineer , Cosmic Electricals & engineers Pvt Ltd

Tachometer, it measure the speed either by direct contact with rotor or by using a laser beam guided towards the moving part and display it on a calibrated analog display or in a digital display