Reading Field Curves / Optical Data; Bar Code Characteristics; Figure 5.7: The Most Important Characteristics Of A Bar Code - Leuze electronic BCL 338i Original Operating Instructions

5.4

Reading field curves / optical data

5.4.1

Bar code characteristics

Note!
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 va-
rious bar code modules.
Figure 5.7:
The range in which the bar code can be read by the BCL 338i (the so-called reading field)
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.
Note!
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.
Leuze electronic
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 inclu-
ding 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 338i
Technical data
(Normal Ratio 1 : 2.5)
B
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