proportional to the amount of light returned. A symbol’s spaces reflect more light than the bars. As the wand is moved across the bar code symbol, the analog voltage varies, creating a graphic scan profile. The scan profile is the basis for verifying the bar code symbol.
Scanner Illumination
It is important to have a uniform velocity when scanning bar code symbols because the relative widths of the actual bars and spaces are determined by measuring the time that the electrical signal from the scanner spends at the voltages that represent either black or white, respectively. The verifier will notify you if you scan too fast, too slow or unevenly.
Also, severe changes in ambient light may cause misleading scan profile or reflectance readings. Therefore, it is important to calibrate and use the verifier in the same general ambient light and, when in use, to minimize variation in the intensity of the ambient light.
Once collected by the
Additional Information
For additional information on bar code technology, you can refer to the associations and books listed below.
•AIM North America - A chapter organization of AIM, Inc., 125
•GS1 (formerly UCC and EAN)
Brussels - Blue Tower, Avenue Louise, 326, BE 1050 Brussels Belgium, Tel: +32 2 788 7800, Fax: +32 2 788 7899
•GS1 US - Princeton Pike Corporate Center, 1009 Lenox Drive, Suite 202, Lawrenceville, New Jersey, 08648 USA, Tel: (609) 620 0200, Fax: (609) 620 1200,
Quick Check® 600/800 Series User’s Guide | 6 - 7 |
