Datalogic Memor X3 User Manual page 44

4
When beams reflect directly back into the scanner from the bar code, they can "blind"
the scanner and make decoding difficult.
To avoid this, don't keep the terminal perpendicular to the barcode: moving it of a
small angle of ±2° is usually enough to enable proper reading. But don't scan at too
oblique an angle either: keep the scanner within an angle of ±30° from the
perpendicular to the barcode in order to guarantee effective scanning.
Specular reflection.
Reflected beam
is within specular
dead zone and
prevents decode.
36
Side Views
Light
Source
Tilt Bar Code At Slight Angle (Up to 30°)
No specular reflection.
Light
Decode can occur.
Source
1 MEMOR™ X3