Specifications
42
BCL 504
i
Leuze electronic
5.5
Reading field curves / optical data
Barcode characteristics
Notice!
Please note that the size of the barcode module influences the maximum reading distance
and the width of the reading field. Therefore, when selecting a mounting location and/or the
barcode label, take into account the different reading characteristics of the scanner with var-
ious barcode modules.
Figure 5.4:
The most important characteristics of a barcode
The range in which the barcode can be read by the BCL 504
i
(the so-called reading field)
depends on the quality of the printed barcode and its dimensions.
Therefore, above all, the module of a barcode is decisive for the size of the reading field.
Notice!
A rule of thumb: The smaller the module of the barcode is, the smaller the maximum reading
distance and reading field width will be.
M
=
Module: The narrowest line or space of a barcode in
mm
Z
B
=
Wide element: Wide lines and spaces 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 barcode in mm includ-
ing 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
