The third problem area has nothing to do with the unit, but rather
the quality of the bar code and / or the scanning technique.
TOLERANCE OF BAR CODE
.
Bar codes may have a tolerance. Normally the tolerances are
caused by Bar code software or of printer, a reputation high
quality bar code software should be choose to generate bar codes.
If the printed bar codes have varied bias distortion of printing, the
scanners will not recognise these bar codes.
.
Users are very difficult to get Good Read" from a poor quality
bar code with the unit unless they scan the symbol many times.
As the quality of the symbol drops, the chances for the undetected
error increase. A bar code (CDV) Check Digit Verification should
br used to check the quality of the suspect symbols.
LABELS ( PAPER & COLOR& PRINTER MACHINE )
.
Mostly, The light source of a bar code reader
is RED, there are
some restrictions for label printing, you should be very careful
when choosing bar code printing material especially colour ink
and paper. Sometimes, as the combination between colour of a
label and colour of the ink, it will cause blindness for the scanner,
as optics physical phenomenon, some colours should be avoided
as it will cause the blindness for the scanner. Regarding this
restriction, please consults with the experts for the detail.
Morever, Bad quality of printing will also results in reading difficulties
for the scanner, The bad printing may be caused by type of printer
machines that you use. Please choose a professional and high
quality bar code printer for label printing. For your advisory, please
avoid printing the bar code with Dot Matrix and Inkjet printers
which will result in the bad quality of printing.
Besides, the quality and condition of the Ink, Ribbon, Carbon,
toners which are not very good condition will also result in the bad
quality of bar code labels. Thus, please always check if the Ink,
ribbon, Carbon toners of the printers are in good condition.
Finally, You should be very careful of choosing Bar code printing
material. The printing material which with the shining surfaces
will cause the reading difficulties for scanners, so please avoid
using the shining material for bar code printing.
.
POOR BAR CODE QUALITY
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