Hand Held Products Quick Check Bar Code Verifiers 800 User Manual

Contents

Quick Check® 600/800 Series User’s Guide 6 - 7proportional to the amount of light returned. A symbol’s spaces reflect more lightthan the bars. As the wand is moved across the bar code symbol, the analogvoltage varies, creating a graphic scan profile. The scan profile is the basis forverifying the bar code symbol.Scanner IlluminationIt is important to have a uniform velocity when scanning bar code symbolsbecause the relative widths of the actual bars and spaces are determined bymeasuring the time that the electrical signal from the scanner spends at thevoltages that represent either black or white, respectively. The verifier will notifyyou if you scan too fast, too slow or unevenly.Also, severe changes in ambient light may cause misleading scan profile orreflectance readings. Therefore, it is important to calibrate and use the verifierin the same general ambient light and, when in use, to minimize variation in theintensity of the ambient light.Once collected by the electro-optical components, the data is transmitted to thecomputer in the verifier. The verifier assesses the data and determines thequality parameters.Additional InformationFor additional information on bar code technology, you can refer to theassociations and books listed below.• AIM North America - A chapter organization of AIM, Inc., 125Warrendale-Bayne Road, Warrendale, PA 15086, Tel: (724) 9345688, Fax: (724) 934 4495, Email: Mary Lou Bosco,http://www.aimusa.org/• GS1 (formerly UCC and EAN)Brussels - Blue Tower, Avenue Louise, 326, BE 1050 BrusselsBelgium, Tel: +32 2 788 7800, Fax: +32 2 788 7899• GS1 US - Princeton Pike Corporate Center, 1009 Lenox Drive, Suite202, Lawrenceville, New Jersey, 08648 USA, Tel: (609) 620 0200,Fax: (609) 620 1200, E-mail: info@gs1us.org, http://www.gs1us.org