Aiming - Symbol LS1900 Series Product Reference Manual

Aiming

Do not hold the scanner directly over the bar code. Laser light reflecting directly back into
the scanner from the bar code is known as specular reflection. This specular reflection can
make decoding difficult. The area where specular reflection occurs is known as a "dead
zone".
You can tilt the scanner up to 65 ° forward or back and achieve a successful decode
2-3). Simple practice quickly shows what tolerances to work within.
65
Figure 2-3. Maximum Tilt Angles and Dead Zone
Specular
Reflection
- + 4
65
Bar
Code
Scanning
(Figure
2-5