Welch Allyn SCANTEAM 2380 WAND Specifications download pdf (Page 53)

A–5

Technical Specifications

A.6 Bar Code Symbol Specifications

All bar code symbols should satisfy the appropriate AIM Uniform

Symbology Specification.

Background Substrate

The bar code symbol should be printed on material which is reflective and

has a matte (not glossy) finish. A background diffuse reflectance of at least

70% to 80% is desirable for optimum contrast.

Ink Color and Type

The inked bars should not exceed 25% reflectance at the wavelength which

is being used for reading, whether printed with black ink or colored ink.

The reflectance value should not vary more than 5% within the same

character. The type of ink should be compatible with the type of radiation

in the optical scanner. If a scanner with an infrared radiation source is

being used, the ink in the code must be IR absorptive (typically carbon

based). Otherwise, the IR would “see through” the ink and be reflected to

the sensor as if from a completely white surface.

Voids and Specks

The code should be printed clearly, free of voids, specks, blemishes and

lines which could “fool” the scanner. Specks or blemishes in the white

spaces, or false or missing bar sections could be interpreted by the reading

equipment as part of the code. Generally, the width of such flaws is more

serious than the height. Code symbols should be rejected if these defects

are present.

Definition

The bars in the bar code symbol should be well defined. Their edges

should not be rough or fuzzy, so that the bars and spaces have the proper

widths intended for the bar code symbology used. Since a scanner’s

aperture and resolution are chosen to comply with these widths, definition

should be sharp and consistent.

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Welch Allyn SCANTEAM 2380 WAND Specifications Page 53