Datalogic matrix 450N, Справочное руководство

Страница: 110 / 175

MATRIX
450N™ REFERENCE MANUAL
98
6
T
exp (max)
and LS
(max)
are represented in the graph below as the curved line for X (code
resolution). Values above the curve result in blurring. In practice, the application values are
somewhere below the theoretical line, (in the green area), due to environmental and other
conditions.
Line Speed
T
exp
SW Limit
T
exp (min)
SW/HW Limit
X
2X
Con
ve
yor
Sp
ee
d
Lim
it
Readable Blurring
For example, the maximum target speed in the application is also affected by these
conditions:

Code/Background Contrast : maximum speed decreases when decreasing image
contrast (poor quality codes, reflective transparent coverings, different supports and
printing techniques).

Code Resolution : maximum speed increases when decreasing code resolution, (i.e. 2X) .
There is a decrement of overlapping effects between two adjacent elements.

Tilt Angle : maximum speed decreases when increasing Tilt angle (from 0 to 45 degrees).
T
exp (min)
is the minimum Exposure Time value obtainable for the specific application. It can
be evaluated in static reading conditions and depends on the Matrix reader hardware
selected for the application (LT-03x lighting system model, optical lens, diaphragm aperture,
reading distance) and on any external lighting system. It may also depend on code printing
quality, and reader position.
The
Internal Lighting parameter allows setting the operating mode of the LT-03x lighting
system. The possible values are:

Disabled : the LT-03x LED array is turned off all the time. This option can be useful if using
an external lighting system;

Continuous High-Power : the LT-03x LED array is turned on continuously at the highest
power level. This option is useful if the LED array blinking (Strobed operating mode)
disturbs the operator.

Very-High/High-Power Strobed : the LT-03x LED array is on only during the image
exposure time. Two different lighting levels can be set.
NOTE:
To avoid LED array overheating, for settings other than disabled, the
program automatically limits the range of allowed values for the Exposure
Time parameter. Therefore, after changes to Internal Lighting , recheck
Exposure Time .