Symbol Technologies LS 400XI - Manual (Page 23)

3-2
LS 400Xi Product Reference Guide
Aiming
Scan the Entire Symbol
t Cross every bar and space of the symbol with the scan beam.
t Hold the scanner further away for larger bar codes.
t 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 “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
0 1 2 3 4 5 0 1 2 3 4 5
65
°
Max
Shaded area represents
dead zone (
±
2
°
)
Bar Code
Scan
Beam Scan
Beam
65
°
Max