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Mounting General Guidelines
• Avoid specular reflections, caused by ambient and internal light
sources.
• The bar code should be slightly off perpendicular to the axis of the
scanner.
• To reduce specular reflections the skew angle can vary significantly
depending on the application such as: ambient illumination sources,
code size and code type.
• Excessive angles should be avoided.
• Other factors, such as surface qualities, mounting distances, secondary
windows and external illumination can easily impact these
recommendations.
• If a secondary window is used, the window should be mounted as close
to the front of scanner as possible at a 90° angle to the optical axis to
avoid specular reflections.
• For secondary windows, Honeywell recommends the following:
o Optical quality glass
o >95% transmission in the nominal 650nm wavelength
o Anti-reflective coating on both sides
• A skew angle of 15° to 20° between the normal of the bar code’s
surface and the optical axis of the imager is sufficient to avoid specular
reflections.
• Avoid pitch angles above 15° to 20° to prevent code compression.
Figure 11.