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7.1.2 Tilt Angle Improvement with ACB
ACB allows barcode reading with an increased tilt angle. The tilt angle depends upon
the code aspect ratio defined as H/L according to the table below:
Aspect Ratio
H/L
0.33
0.25
0.125
7.2
Linear Code Reading
For linear code reading, the number of scans performed on the code by the VB14A
and therefore the decoding capability is influenced by the following parameters:
• "number of scans per second
• "code motion speed
• "label dimensions
• "scan direction with respect to code motion
About 5 scans during the code passage should be allowed to ensure a successful
read.
7.2.1 Step-Ladder mode
If scanning is perpendicular to the code motion direction (figure 7.1 - "step-ladder"
mode), the number of effective scans performed by the reader is given by the
following formula:
SN = [(LH/LS) ∗ SS] - 2
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
L L
www.pepperl-fuchs.com
Max theoretical lin-
ear tilt angle
18°
14°
7°
Where:
SN = number of effective scans
LH = label height (in mm)
LS = Label movement speed in (mm/s)
SS = number of scans per second
Barcode Scanner VB14A
READING FEATURES
Max practical
ACB angle
30°
23°
11°
Copyright Pepperl+Fuchs, Printed in Germany
33
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