Omron MicroHAWK V320-F User Manual

8-9
8 Advanced Settings
MicroHAWK V320-F / V330-F / V420-F / V430-F Barcode Reader User Manual
8-6 I/O
8
8-6-2 Symbol Grading
The symbol grading features presented in this document are not intended and should not be confused
with symbol verification. Verifier and symbol verification is beyond the scope of this document but there
are a few points worth noting to aide in understanding the features and operation provided.
Verifiers are systems designed to meet the rigorous standards within the verification specifications. To
provide compliant verification verifier systems are not only designed with required features and
functionality from the supported standard but also provide many general design features that help
eliminate sources of variability that can impact measurements. In contrast readers are designed to
provide maximum product flexibility for integration into systems that require reading for traceability. Key
reader design specifications such as size, cost, reading range, and reading speed are a few items that
drive differences between verifier and reader designs. Understanding these tradeoffs in design can
help users optimize reader systems to provide better accuracy and repeatability in grading
implementation.
 Calibration
Compliant verification requires verifies have calibration processes. These processes are required to
ensure proper references for grading metrics. The MicroHAWK provides no calibration features. It is the
user’s responsibility to understand how lack of calibration may impact their grading measurements. In
addition, some metrics in verification such as Minimum Reflectance in ISO 29158 are directly
calculated using data only provide through calibration and have no means of representation without
such a process.
 Optical Positioning and Illumination Response
The presentation of the symbol to the reader can have numerous different impacts on grading
performance. Verifiers are designed to provide an image with sharp focus, high resolution, and low
optical distortion. These items allow verifiers to provide an environment that produces measurements
with consistent results. When selecting and positioning a reader for grading it is important that the
optical setup provide enough resolution to meet the minimum resolution requirements for that standard
(reference standard section for resolution requirements). Although resolution is important the working
distance from the imaging optics also plays a significant role in the light collection and optical distortion
characteristics of the image system. Further away provides less optical distortion over the field of view
but also will have significant impact on the distribution of light depending on the source of illumination.
When preparing a system for a grading implementation you must take these items under consideration.
First identify the allowable working distances that will provide the target symbols in focus and above the
minimum required resolution. Next attempt to provide the most consistent illumination response over
the inspection field at the farthest distance. The change in illumination response over distance will be
very dependent on the illumination source and environment. Finally, the orientation and consistency of
the symbol presentation within the field of view can also impact repeatability. If the illumination response is
uneven in the field and the symbol rotated or moves throughout the field you can expect variability.
8-6-2 Symbol Grading
Grading Overview

Omron MicroHAWK V320-F Specifications

General

Brand	Omron
Model	MicroHAWK V320-F
Category	Barcode Reader
Language	English