Symbol LS4000P Series, Product Reference Manual

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3-2
LS 4000P Series Product Reference Guide
Aiming
Scan the Entire Symbol
!
Cross every bar and space of the symbol with the scan beam.
!
Hold the scanner further away for larger bar codes.
!
Hold the scanner closer for symbols with bars that are close together.
Right Wrong
Hold at an Angle
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 strong light can
temporarily “blind” the scanner and 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 still achieve a successful decode
(Figure 3-1). Simple practice quickly shows what tolerances to work within.
Figure 3-1. Maximum Tilt Angles and Dead Zone
65
4
65
Successful
Scanning
Possible Specular
Reflection
Successful
Scanning