Download Digital Tachometer Project Report PDF

TitleDigital Tachometer Project Report
Tags Electrical Engineering Power (Physics) Analog To Digital Converter
File Size1.9 MB
Total Pages57
Document Text Contents
Page 1

WIDE RANGE DIGITAL TACHOMETER (WRDT)



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1.0 INTRODUCTION

Digital tachometer is an optical encoder that determines the angular velocity of

a rotating shaft or motor. Digital tachometers are used in different applications such as

automobiles, aeroplanes, and medical and instrumentation applications.

The word tachometer is derived from two Greek words: tachos means “speed”

and metron means “to measure”. It works on the principle of a tachometer generator,

which means when a motor is operated as a generator, it produces the voltage according

to the velocity of the shaft. It is also known as revolution-counter, and its operating

principle can be electromagnetic, electronic or optical-based. Power, accuracy, RPM

range, measurements and display are the specifications of a tachometer. Tachometers

can be analogue or digital indicating meters; however, this article focuses only on the

digital tachometers.

1.1 TYPES OF DIGITAL TACHOMETER

Digital tachometers are classified into four types based on the data acquisition

and measurement techniques.

 Based on the data acquisition technique, the tachometers are of the following types:

1. Contact type

2. Non-Contact type

 Based on the measurement technique, the tachometers are of the following types:

1. Time measurement

2. Frequency measurement





Fig 1.1.A: Contact type Fig 1.1.B: Non-contact type



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