Hand Held Products Quick Check Bar Code Verifiers 800 - How a Bar Code Verifier Works

6 - 6 Quick Check® 600/800 Series User’s Guide
The following table lists some characteristics of the nine bar code symbologies
decoded by the Quick Check 600/800 Verifier.
How a Bar Code Verifier Works
A bar code reader or scanner extracts the information that is optically encoded
in a bar code symbol and converts it into computer-compatible digital data.
Hand Held Products provides a variety of handheld wand or pen scanners with
the verifier that are designed to minimize scratching the symbol. When you place
the wand on a bar code symbol and move it across the symbol, electro-optical
techniques read the symbol. All wands contain a light emitting diode (either
visible or infrared light) which illuminates the symbol.
The area of the symbol that is actually being scanned at any given time is
referred to as the “spot” and is defined by an aperture. The spot size varies
depending on which wand is used. The spot is formed by flooding the symbol
with light. A tightly focused aperture collects the light. The light reflected from
the spot is directed to a photodiode detector which generates a small current
Symbology Character Set
Element
widths
UPC
EAN
Codabar/USS Codabar
Code 39
Code 11
Interleaved 2 of 5
Code 16K
Code 128
Code 49
Code 93
MSI Code
numeric
numeric
numeric with 6 special char-
acters
alphanumeric, 26 uppercase
letters, 10 digits, 7 special
characters
numeric and ---
numeric
alphanumeric with all func-
tion codes and special char-
acters (full ASCII set)
alphanumeric with all func-
tion codes and special char-
acters (full ASCII set)
alphanumeric (all 128 ASCI
characters)
alphanumeric (all 128 ASCI
characters)
numeric
4 widths
4 widths
2 widths
2 widths
3 widths
2 widths
2 widths
4 widths
6 widths
(stacked symbol-
ogy)
4 widths
4 widths