Reading Field Curves / Optical Data; Bar Code Characteristics; Figure 5.6: The Most Important Characteristics Of A Bar Code - Leuze electronic BCL 300 Series Technical Description

Specifications
5.4

Reading field curves / optical data

5.4.1

Bar code characteristics

Notice!
Please note that the size of the bar code module influences the maximum reading distance
and the width of the reading field. Therefore, when selecting a mounting location and/or the
bar code label, take into account the different reading characteristics of the scanner with var-
ious bar code modules.
Figure 5.6:
The range in which the bar code can be read by the BCL
depends on the quality of the printed bar code and its dimensions.
Therefore, above all, the module of a bar code is decisive for the size of the reading field.
Notice!
A rule of thumb: The smaller the module of the bar code is, the smaller the maximum reading
distance and reading field width will be.
52
The most important characteristics of a bar code
M = Module: The narrowest line or space of a bar code
in mm.
Z = Wide character: Wide bars and gaps are a multiple
B
(ratio) of the module.
Module x Ratio = Z
B = Quiet zone: The quiet zone should be at least 10
Z
times the module, but not less than 2.5mm.
L = Code length: The length of the bar code in mm
including the start and stop characters. The quiet
zone is included depending on the code definition.
S = Bar length: Height of the elements in mm.
L
BCL 304i
(Normal Ratio 1 : 2.5).
B
304i (the so-called reading field)
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