HandHeld SV series, User Manual

Page: 40 / 104

5 - 2 Quick Check® SV Series User’s Guide
Notes:
1. Scan distance is measured from the protruding edge of the face of the scan-
ner.
2. Scan angle is measured in degrees relative to vertical from the surface of the
bar code.
3. The scanner can be mounted in any orientation. The illustration on page 5-1
shows the beam angle relative to the bar code placement in the beam.
Bar Code Travel Direction
Bar codes can be scanned in a static location, or more commonly with on-line
scanner/verifiers, they can be scanned while moving through the laser beam.
The illustration below shows the two directions a bar code can travel through the
laser beam. They are designated “picket fence” and “ladder” directions.
The SV unit must be programmed for the direction of travel of the codes being
analyzed. If the codes are being scanned in a static condition, use the picket
fence travel direction.
Bar Code Travel Speed Considerations
A bar code should be present in the beam for at least five scans for the most
reliable operation. The SV Series performs a minimum of 100 scans/analyses
per second. At that rate, each analysis is accomplished in 10 milliseconds
maximum. Therefore, a bar code must be in the beam for at least 50
milliseconds to be reliably analyzed. Some SV models have higher minimum
scans/analysis; therefore a bar code must be in the beam for less amount of time
for those models.
Direction
Laser Beam
Ladder Travel Direction
Picket Fence Travel