Barcode Scanner VB14
READING FEATURES
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
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
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13
READING FEATURES
The number of scans performed on the code by the VB14 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
At least 5 scans during the code passage should be allowed to ensure a successful
read.
13.1
STEP-LADDER MODE
If scanning is perpendicular to the code motion direction (figure 13.1 - "step-ladder"
mode), the number of effective scans performed by the reader is given by the
following formula:
SN = [(LH/LS)
∗
SS] - 2
Where:
SN = number of effective scans
LH = label height (in mm)
LS = Label movement speed in (mm/s)
SS = number of scans per second
Figure 13.1 "Step-Ladder" scanning mode
For example, the VB14-440 (800 scans/sec.) for a 25 mm high code moving at 1250
mm/s performs:
[(25/1250)
∗
800] - 2 = 14 effective scans
Laser
beam
LH
VB14
