6.3 READING DIAGRAMS
The following reading diagrams are to be considered as references and are given for
typical performance at 25°C using high quality grade A symbols: Code 128 (1D code) and
Data Matrix ECC 200 (2D code) from the Test Charts available in the SW-DOCS-TEST
CHART accessory (93ACC0148).
Testing should be performed with the actual Matrix 120 using application codes in order
to evaluate whether maximizing application performance requires adjustments to the
HW/SW configuration with respect to the Reference Conditions given under each
diagram.
The ratio of the Vertical FOV width with respect to the Horizontal FOV width in the
diagrams depends on the model:
- for WVGA is about equal to 0.64; specifically 480/752. (i.e. FOVV. FOVH x 0.64).
- for MP is about equal to 0.75; specifically 960/1280. (i.e. FOVV. FOVH x 0.75).
The reading distance ranges are measured from the reading window surface.
Common software parameter settings for all models (except where specified differently)
are:
- reading all 1D code symbologies - Processing Mode=Standard;
- reading 2D code symbologies - Processing Mode=Standard; Code Contrast=Low;
Decoding Complexity=Medium.
When defining a HW/SW configuration for the Matrix 120 for conditions different from
those of the reference diagrams, it is suggested to keep in mind the following rules:
- Changes in Exposure Time act directly proportional to the luminosity of the image and
inversely proportional to the maximum code reading movement speed. Consequently,
reducing the Exposure Time by half, reduces the luminosity of the image by half but
doubles the theoretical code reading movement speed.
- Changes in Gain act directly proportional to the luminosity of the image. Increasing
the Gain value however, can reduce the quality of the acquired image.
The max theoretical Line Speed values for each diagram can be calculated using the
formula in par. 6.4.
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