Welch Allyn SCANTEAM 2380 WAND Specifications download pdf (Page 17)

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Operational Description

Red illumination is compatible with most printing inks including most

thermal papers. Because it provides a visual indication to the operator that

the scanner is functioning, red illumination is considered to be more user

friendly. Visual feedback to the operator is an important consideration

when making a scanner selection.

2.5.2 Scanning Aperture

Scanning performance is affected by the size of the scanning aperture and

it is a significant factor to be considered when selecting a scanner. The

scanning aperture defines the effective size of the area of the bar code

symbol viewed by the scanner optics. It affects the relative ability of the

scanning device to “see” or resolve bars and ignore printing defects.

Large aperture systems typically cannot resolve high density bar code or

the small printing features (voids within bars or dark specs within the light

areas) that small aperture systems would. Thus, they are more compatible

with low density bar code and more tolerant of printing defects

characteristic of poorly printed labels.

Small aperture systems (high resolution) are better able to resolve which

makes them compatible with high density good quality symbol reading

requirements.

The SCANTEAM 2380 is available with circular apertures ranging from 6

to 8 mil.

Most scanning applications can be satisfied with a 6 mil (high resolution)

or a 8 mil (low resolution) aperture. When selecting an aperture, it is

recommended that the aperture dimension be no less than 0.7 times the “X”

(width of the narrowest bar code coding element) dimension to be read.

An aperture size that is slightly smaller than the narrowest bar code

element, 0.9 times “X,” provides optimum resolution of the bars and results

in the generation of a digital signal which accurately represents the bar

code. An 8 mil (0.2mm) aperture is often a good compromise when labels

produced by different printing and label generation methods must be read

with one scanner. In no case should the viewing aperture exceed 1.2 the

“X” dimension.

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Welch Allyn SCANTEAM 2380 WAND Specifications Page 17