Technical data
Leuze electronic
BCL 338
i
51
TNT
35/7-2
4
V
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 most important characteristics of a bar code
The range in which the bar code can be read by the BCL 338
i
(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.
M
=
Module: The narrowest line or space of a bar code in
mm
Z
B
=
Wide character: Wide bars and gaps are a multiple
(ratio) of the module.
Module x Ratio = Z
B
(Normal Ratio 1 : 2.5)
B
Z
=
Quiet zone: The quiet zone should be at least 10
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
L
=
Bar length: height of the elements in mm