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2-8 Chapter 2: Features, Functions, and Kits
Scan Zone
The scan lines are dispersed in a forward and backward direction from
both windows. This allows the scanner to read a) on four sides, b)
from left-to-right or right-to-left, and c) inverted labels. If the scan
zone is thought of as a cube resting on the horizontal scan window, the
scanner is able to read the leading, trailing, bottom, and far surfaces.
Another way of describing the scan zone is – if the checker can’t see the
bar code label, then the scanner can. The scan zone extends to 20.3 cm
(8 in.) high off the horizontal window. Bi-optical scanning makes the
scan zone large enough to allow a label to be read off of a tall soup can
even when upside-down
Scanner Power Requirements
The laser diode occupies little space, draws low current, and produces
little heat. The light produced by the scanners in current models has
been shifted toward the edge of the visual spectrum so it is not possible
to see the scan pattern in normal lighting. When active, the laser uses
22 watts. A soft power down feature allows major portions of the 7870
to shut down when no motion is detected. While in sleep mode, the
scanner’s power requirements drop to 10 watts, a 65% reduction. A
more valuable advantage of the soft power down feature is the run
time reduction of critical components which translates directly into
extending the life of the scanner. The scanner automatically powers up
after detecting motion in approximately two seconds.
Soft Power Down
During periods of inactivity, components of the scanner and scale shut
down to conserve power, reduce wear, and extend product life. A
motion sensor detects activity and signals the unit to power up from
sleep mode. The power up takes less than two seconds.