Datalogic matrix 450N Reference Manual

Also see for matrix 450N: Manual Product reference guide

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Datalogic matrix 450N Reference Manual Manual pdf 99 page image

READING FEATURES8766.2 READING DIAGRAMS The following reading diagrams are to be considered as references and are given fortypical performance at 25°C using high quality grade A symbols: Code 128 (1D code) andData Matrix ECC 200 (2D code) from the Test Charts provided with the reader. Testing should be performed with the actual Matrix 450N + LT-03x assembly usingapplication codes in order to evaluate whether maximizing application performancerequires adjustments to the HW/SW configuration with respect to the ReferenceConditions given under each diagram. The ratio of the Vertical FOV width with respect to the Horizontal FOV width in thediagrams is about equal to 0.84; specifically 2050/2448. (i.e. FOVV.  FOVH x 0.84). The focus distance and reading distance ranges are measured from the Lens Coverwindow surface. When using a 25 mm focal length lens (LNS-1225), it is possible to use Super NarrowAngle Lighting Systems (LT-030 or LT-031) as well as the Narrow Angle Lighting SystemLT-032. It is suggested to use the LT-032 in applications with very low contrast codesand in all cases where the higher lighting power of the LT-030 isn't necessary. LT-030and LT-031 Lighting Systems are especially effective in high speed code movementapplications. When defining a HW/SW configuration for the Matrix 450N + LT-03x assembly forconditions different from those of the reference diagrams, it is suggested to keep in mindthe following rules: Changes in the diaphragm aperture influence the depth of field (reading distancerange) and the luminosity of the image. Increasing the the diaphragm aperture byone stop (i.e. from F/8 to F/5.6 or from F/11 to F/8) doubles the luminosity of theimage, but can cause significant reduction in the reading distance range. Changes in Exposure Time act directly proportional to the luminosity of the imageand inversely proportional to the maximum code reading movement speed.Consequently, reducing the Exposure Time by half, reduces the luminosity of theimage 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 LT-030 lighting power (at the center of the field of view) is about equal totwice that of the LT-031 and 3.5 times that of the LT-032.For example, for the purpose of only changing the luminosity of the image, thefollowing three adjustments are equivalent:increase the the diaphragm aperture by one stop;double the Exposure Time;double the Gain.