Symbol Technologies LS 1000 - Manual (Page 21)

2-4
LS 1000 Product Reference Guide: Chapter 2, Scanning
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 achieve a successful decode.
Simple practice quickly shows what tolerances to work within.
1. Successful Scanning. 3. Successful Scanning. 2. Possible Specular Reflection.
65
°
65
°
Shaded area represents
dead zone (
±
2
°
)
Bar Code Bar Code Bar Code
Scan
Beam
Scan
Beam
coverBook Page 4 Monday, December 1, 1997 2:19 PM