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PULSE-TO-REVOLUTION CONVERTER FOR CALIBRATION OF NON-CONTACT TYPE DIGITAL TACHOMETER

IP.com Disclosure Number: IPCOM000008102D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-17
Document File: 2 page(s) / 77K

Publishing Venue

Motorola

Related People

J. C. Shin: AUTHOR

Abstract

The Pulse-to-Revolution Converter is an Infrared emitting unit originally devised for calibra- tion of Non-contact type digital Tachometers, being used in combination with a Frequency Counter and a Signal Generator.

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0 M M-LA

Technical Developments

PULSE-TO-REVOLUTION CONVERTER FOR CALIBRATION OF

NON-CONTACT TYPE DIGITAL TACHOMETER

by J. C. Shin

INTRODUCTION

  The Pulse-to-Revolution Converter is an Infrared emitting unit originally devised for calibra- tion of Non-contact type digital Tachometers, being used in combination with a Frequency Counter and a Signal Generator.

  The Converter converts pulses from the Signal Generator into Infrared signals flickering at exactly the same frequency as the frequency of the pulses from the Signal Generator, Furthermore, the fre- quency of the flickering Infrared signals, which is synchronized to frequency of the pulses from the Signal Generator is monitored by the Frequency Counter being used as a Frequency standard, and is also read by the Digital Tachometer for calibration,

  The calibration process is performed by com- paring the frequencies read by the Frequency counter and the Digital Tachometer respectively.

DESCRIPTION

  The physical structure of the Pulse-to- Revolution Converter is shown in Figure 1 and its schematic circuit is shown in Figure 2.

The Pulse-to-Revolution Converter is com- posed of 1 Transistor, 2 InfraRed Light Emitting

Diodes (IR LED), 2 Resistors, 1 Green LED, and 1 capacitor as shown in Figure 2.

  The IR LEDs and the Green LED are turned on when the transistor (2N2222) is activated by the input puse signal from the Signal generator, emit- ting flickering InfraRed and a green indicator light.

  At this time, the Frequen...