Honeywell Vuquest 3310g, User Manual

Page: 250 / 278

12 - 4
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:
• Optical quality glass
• >95% transmission in the nominal 650nm wavelength
• Anti-reflective coating on both sides
• Avoid window thickness above 2mm
• 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 20° to prevent code compression.
Ө