Denso BHT-7000 - Manual (Page 18)

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• If the BHT fails to read due to specular effects or other
factors, change the scanning angle of the reading win-
dow or the distance from codes as shown at right, and
try it again. (Specular effects occur when the reflec-
tion of the light from the bar code becomes exces-
sively strong. This can easily happen when the re-
flecting 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
bar-code reading window. (**For details about the scanning conditions, refer to
the Appendix A.)
• Before reading bar codes, clean those labels 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 BHT to the target bar code so that the
code comes to the center of the scanning range indicated by the laser beam.
• When you pull the bar-code reading window away from the bar codes, the actual
scanning range will become narrower than the range covered by the laser beam.
• The light intensity of the laser light or illumination LED will vary depending upon
the scanning conditions and variation of their elements.
1.1 Reading Bar Codes
Turn on the BHT power, 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. Keep the BHT
in a position where the bar code lies within the scanning range indicated by the laser
light (marker).
When the BHT has read the bar code successfully, the indicator LED will illuminate in
green.
NOTE
TIP
Bar code scanning
range indicated by
the laser light
Max. 40 cm
(15.7")**
Trigger switch (M3 key)*
PW key
Trigger switch
(M4 key)*
Indicator LED
(Illuminates in green when
the BHT has read the bar
code successfully.)
* The trigger switch function is
assigned to both of the M3 and
M4 keys by default.)