If you are placing a window between the device and the target, follow these guidelines:
Window Clear Opening - Make the clear opening of the window large enough so that the entire clear aperture passes through the window. Cutting off any part of the clear aperture can degrade decode range performance. Ensure that window placement relative to the
SM20
accounts for tolerances on all parts involved in that assembly.
Minimum Window Distance - 5 mm (.2 in.).
Optical Working Range - Adding a window can reduce the working range of the scanner because there is a signal loss when passing through window material. To minimize this reduction, use a special coating described in Commercially Available Coatings. To understand the difference, test the scanner in the desired orientation and see if the difference affects the scanner's performance.
