TOLERANCE OF BAR CODE
.
LABELS ( PAPER & COLOR & PRINTER )
POOR BAR CODE QUALITY
TROUBLE SHOOTING
-- GROUP 46 --
62
The third problem area has nothing to do with the scanner, but
rather the printed quality of the bar code and/or the scanning tech
nique employed.
It is very difficult to get a good read from a poor quality bar code
unless it is scanned many times. As the quality of the symbology
drops, the chances for undetected error increase. A bar code Che
ck Digit Verification (CDV) should be used to check the
quality of the suspect bar codes.
A bar code may have a tolerance. Normally, the tolerances are
caused by bar code font software or a printer. Software with a
proven reputation should be chosen to generate bar codes. If the
printed bar codes are distorted, the scanner might not recognize
them.
The light source of a bar code scanner is generally red, so there are
some restrictions for the printing of labels. Care should be taken when
choosing materials, especially color inks and papers. Sometimes the
combination of the label color and the color of
the ink can , in effect, blind the scanner. Media with a shiny surface will
also cause reading difficulties for scanners.
Moreover, poor printing quality can also result in reading difficulties
for the scanner. Bad printing may be caused by the type of printer
used; dot matrix and inkjet printers will not produce high quality bar
codes. Also check to make sure the ink, ribbon, or toner in good supply.
Summary of Contents for Econoscan
Page 1: ...CHECK VERSION IDT CH R R 80042504 001 Rev A R04 05 464 DEFAULT ...
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Page 58: ...0 0 2 2 4 4 6 6 8 8 1 1 3 3 5 5 7 7 9 9 GROUP 40 FULL ASCII CODE 39 NUMERIC TABLE 56 ...
Page 66: ...ID TECH 10721 Walker Street Cypress California 90630 714 761 6368 http www id tech net ...
