Denso BHT-470BWB-CE Operator's Manual page 16

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? If the BHT fails to read due to specular effects or
other factors, change the scanning angle of the
reading window or the distance from codes as
shown at right, and try it again. (Specular effects
occur when the reflection of the light from the bar
code becomes excessively strong. This can easily
happen when the reflecting surface is polished or
covered with vinyl.)
? The laser light indicates the scanning range as a
guide. The indicated scanning range will deviate a
little bit from the actual one. Keep the BHT so that
the laser light comes to almost the center of the
bar code height.
? The bar code reading procedure may differ depending upon the application used,
so follow the application's manual.
? Before reading labels, clean them if stained.
? Avoid using the BHT in direct sunlight. The BHT might fail to read
correctly.
? To read bar codes on curved surfaces, apply the bar-code reading window
to the center of each bar code at a right angle.
? If you pull the bar-code reading window away from bar codes, the actual
scanning range will become narrower than the range covered by the
illumination LED.
The light intensity of the laser light or illumination LED will vary
depending upon the scanning conditions and variation of its elements.