User Manual

26
Using the BHT
When Unable to Successfully Read Barcodes
Cause
Countermeasure
Specular
reflection
When the illumination LED is
focused on the printed surface of
the barcode from directly above,
there are times when scanning is
unsuccessful due to specular
reflection.
Change the BHT scanning angle and try
again.
Distance from
barcode
Scanning may be unsuccessful if
the BHT reading window is too
close to or too far from the
barcode, even when the barcode is
within the illumination LED range.
Move the BHT slowly toward or away from
the barcode and try again.
The illumination LED range is only a
guideline.
Barcodes can be read at a maximum
distance of 62 cm from the BHT reading
window.
Barcode surface
curvature
Scanning may be unsuccessful if
the barcode surface is curved.
Scan the barcode at the center of the
barcode reading window.
Barcode surface
dirt
Scanning may be unsuccessful if
the barcode surface is dirty.
Wipe the dirt from the barcode and try
again.
Barcode reading
window dirt
Scanning may be unsuccessful if
the barcode reading window is
dirty.
Blow any dust away with an airbrush, and
then gently wipe the reading window with a
cotton swab or similar soft object.
Direct sunlight,
ambient light
Barcode scanning may be
adversely affected by direct
sunlight or the brightness of the
surrounding light.
Perform barcode scanning away from
direct sunlight. Try adjusting the brightness
of the surrounding light when scanning
indoors.
Scanning Barcodes