Omron V460-H User Manual page 58

3 Basic Operation
The Department of the Navy (DON) IUID Marking Guide (Item Unique Identification (IUID) Marking
Guide: Applying Data Matrix Identification Symbols To Legacy Parts) states the following:
"Flat surfaces are preferred over curved surfaces for marking when a choice is available. A rectangular
symbol, rather than a square symbol, is better for application to polished concave or convex cylindrical
parts. The rectangle is sized to fit either within the reflective band of light that emanates from the spine
of the curve or on 5% of the circumference. Under normal room light, this band of light typically occupies
16% of the diameter of the curve but can increase in size under bright light conditions. To apply larger
symbols, the surface should be textured to reduce glare or matte-finished, laser-markable paints should
be used to mark the part."
3
Readability Tables – DPM, Shiny Cylindrical / Curved Parts
The readability tables below show the calculated PPE (pixels per element) for a range of typical
code sizes (X-dimension) at certain working distances. For a 1D barcode (high-contrast DPM): 2.0
PPE is suggested as a minimum. 2.5 PPE or more is preferred. For a 2D code (high-contrast DPM):
3.0 PPE is suggested as a minimum. 4.0 PPE or more is preferred.
A 5.0 mil 1D barcode should be read at a distance ≥ 50 mm. A 5.0 mil 2D code should be read at a
distance < 25 mm.
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V460-H Industrial Handheld DPM Reader User Manual