Worth Data 5000 TriCoder s Especificaciones descargar pdf (Pagina 18)

Laser Scanners

Laser scanners have a very precise beam of light that is reflected accurately

several inches to several feet. Almost all laser scanners today have a moving

beam that sweeps back and forth, (some older laser scanners required the user to

move the beam across the bar code). The advantages of moving beam laser

scanners are:

• Reading bar codes from a distance (typically 3-18 inches, or up to

17 feet with reading low density bar codes).

• Reading moving objects on an assembly line.

• No-hands operation. Some lasers can be mounted to turn on

automatically when an object passes under the scanner. Typically

used in blood banks, library check out, etc.

• Reading through glass windows or thick laminates.

• Reading bar codes on curved surfaces, (bags of parts).

• Reading bar codes inside difficult to reach enclosures.

Laser scanners emit a laser light beam that sweeps back and forth across the bar

code 36 times per second. At this rate, unsuccessful reading attempts go

unnoticed; you will only be aware of the one successful decode. Once a read has

occurred, the laser turns off, requiring you to release and pull the trigger again to

reactivate the laser scanner.

The lower the density of the bar code, the further the distance the laser scanner

can read a bar code. The higher the density of the bar code, the closer to the bar

code the laser scanner must be.

Triggered Laser Scanners

Scanners are virtually "can't miss". Just "point and shoot". Face the bar code so

that the bars point up (the laser light will then form a red line across the bar code

when the trigger is pulled). Aim the gun scanner at a bar code, and pull the

trigger; reading is instantaneous. You may have to move the scanner closer to

the bar code to get a read, but that's it. Triggered laser scanners are about 5-10

times more expensive than a wand scanner, but scanning is significantly easier.

Pay attention to the length of the warranty on laser scanners; it could prove to be

very important with heavy usage.

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Worth Data 5000 TriCoder s Especificaciones Pagina 18