Optical Mark Recognition (OMR) • 5
Defining the Clear Zone
When requested by the machine, measure and enter the distance
(A)from the top edge of the sheet to the point after the printed matter where you wish the machine to START scanning.
Again, when requested by the machine, measure and enter the distance (B) from the start point just set, to the point you wish the machine to STOP scanning. This is called the Clear Zone.
Note that setting the Clear Zone closer to the beginning and end of the OMR marks decreases the possibility of any poor print or imperfections on the material being interpreted as OMR marks. Conversely, setting the Clear Zone too close to the beginning and end of the OMR marks could cause problems if the position (registration) of the printing on the material varies. A good guide is to limit the Clear Zone, but always allow at least 3/4” (20mm) before and after the OMR marks.
| TOP OF SHEET |
A |
|
| Grey area |
| indicates |
| printed matter |
B | on material |
SV40221 Rev. A |