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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 code
becomes excessively strong. This can easily
happen when the illumination LED lights codes
perpendicularly or due to the angle of ambient
intense lighting to codes.)
•
The actual scanning range is narrower than the marker range. The scanning
range is approx. 2.4" (6 cm) wide by 1.6" (4 cm) high when the scanning distance
is approx. 4" (10 cm).
•
Allow only a single code to come within the scanning range. If two or more codes
lie within the scanning range at the same time, the scanner may fail to read or
continue reading those codes alternately.
•
The scanner can read codes omnidirectionally. Note that a target code plus its
margin should lie within the scanning range.
•
The marker beam range should be used merely as a guide. It does not assure
that a code within the marker beam range can be read.
•
The 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 codes on curved surfaces, apply the reading window to the center
of each code at a right angle.
The light intensity of the marker beam or illumination LED will vary
depending upon the scanning conditions and variation of its elements.
