Specifications

30 DataMan 300 Quick Reference Guide DataMan 300 Quick Reference Guide 31
• The supplied focus target (120x120mm) is appropriate for typical working
distances. If you are using a working distance such that the target does
not completely ll the image, make sure that there are no high-contrast
features visible outside of the target (see previous bullet).
Perform the following steps to use Focus Feedback:
Setting Focus (Continued)
1. Connect the reader to the Setup Tool.
2. On the Results Display pane, check the Focus Feedback option and enable
Live Display.
3. The Focus Feedback column is displayed in colors ranging from red (bad
focus) through yellow to green (sharp focus).
Position the reader in a way that the focus column becomes green. The
maximum focus peak gets locked for better orientation. When the focus
column is green, the lens is in focus and you will be able to decode the image.
Field of View and Reading Distances
For the C-mount (or other non-Cognex) S-Mount lenses, the lens’s focal
length, focus setting, and aperture setting determine the eld of view
and reading distance.
The following maps show the eld of view of the DataMan 300 and the
DataMan 302 readers. Reading distance values are also provided for 1-D
and 2-D example code distances.