Direct Part Marking - Motorola MC3090G - Win CE 5.0 Core User Manual

Table 2-9 MC3000 Imager Decode Ranges (Continued)
Bar Code Density
PDF417 6.67 mil
PDF417 10 mil
PDF417 15 mil

Direct Part Marking

Direct Part Marking (DPM) is where an item is physically altered by methods such as dot peening, laser and
electro-chemical etching to produce two different surface conditions. These marking result in the symbol being
created by either smooth and rough (or dull and shiny) areas on the substrate or a symbol comprised "dots" below
or above the substrate surface. DPM is typically used with matrix symbologies. As a result, there is often very little
or no contrast between the "marked" elements of a symbol and the background.
Dot Peening
Figure 2-22 Examples of Direct Part Marking
To scan a DPM symbol using the imager:
Center the symbol in any orientation within the aiming pattern. Ensure the entire symbol is within the
1.
rectangular area formed by the brackets in the aiming pattern.
Symbol
View Finder
(Aiming Pattern)
Figure 2-23 Centering Symbol in Aiming Pattern
The aiming pattern is smaller when the Imager is closer to the symbol and larger when it is farther from the
2.
symbol. Scan symbols with smaller elements closer to the unit and those with larger elements farther from the
unit.
Hold the mobile computer between two and nine inches (depending on symbol density) from the symbol,
3.
centering the aiming pattern cross hairs on the symbol. Do not aim the exit window directly at the surface to
avoid reflection back into the imager. Hold at a slight angle.
Ranges
Near
5.3 in 7.7 in
13.46 cm 19.56 cm
4.3 in 11.1 in
10.92 cm 28.19 cm
3.8 in 14.4 in
9.65 cm 36.58 cm
Laser
Operating the MC3000 2 - 27
Far