Denso BHT-7500 - Manual (Page 22)

2
• 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.)
• Keep the BHT at a distance from a target bar code so that the bar code comes
within approx. 90% of the laser scanning range (line length).
• The BHT can read bar codes at a maximum distance of 56 cm (22.0")** from the
bar-code reading window.
**Under the following conditions:
- Ambient illuminance: 500 x (Xenon lamp)
- Code 39
- Reflection intensity: 85% min. for white and 5% max. for black
- Minimum narrow bar width: 1.4 mm min. (55.1 mils min.)
• The bar code reading procedure may differ depending upon the application
used, so follow the application's manual.
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 scan the bar
code.
When the BHT has read the bar code successfully, the indicator LED will illuminate in
green.
* The trigger switch function is
assigned to both of the M3 and
M4 keys by default.
Bar code scanning
range covered by
the laser light
Trigger switch (M3 key)*
PW key
Trigger switch
(M4 key)*
Indicator LED
Max. 56 cm
(22.0")**