Reading Bar Codes - Denso BHT-100BW-CE User Manual

1.1 Reading Bar Codes

Turn the BHT on, bring the bar-code reading window to the bar code to be scanned, and press the
trigger switch. The BHT emits a laser light to indicate the scanning range and turns on the illumination
LED to scan the bar code.
When the BHT has read the bar code successfully, the indicator LED will illuminate in green.
Bar code scanning
range covered by
the laser light
• 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 BHT can read bar codes at a maximum distance of 40 cm (15.7")* from the
reading window. (*For details about the scanning conditions, refer to Appendix
A )
• 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 illumination LED will vary depending upon the scanning conditions and
variation of its elements.
• The light intensity of the laser light or illumination LED will vary depending upon the scanning
conditions and variation of its elements.
Trigger switch
(M3 key)
Max. 40 cm (15.7")*
Indicator LED
Illuminates in green when the
BHT has successfully read the
bar code.
Trigger switch
(M4 key)
PW key
2