Welch Allyn SCANTEAM 2380 WAND Specifications download pdf (Page 19)

2–5

Operational Description

2.5.6 Print Contrast

Print contrast is a measure of the relative difference in brightness between

the bars and spaces of a symbol and is specified as the Minimum

Reflectivity Difference (MRD). The MRD is the difference between the

lowest minimum space reflectance value and the highest maximum bar

reflectance value as measured across the entire symbol.

MRD = Max (R

max) – Min (R

min)

where: R

min = Minimum Space Reflectance

max = Maximum Bar Reflectance

The scanner will operate with a MRD as low as 37.5% with the proper

aperture and appropriate symbol.

A complete description of bar code specifications for factors which affect

overall bar code quality are provided on page A–5.

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Welch Allyn SCANTEAM 2380 WAND Specifications Page 19