Datalogic Matrix 120, Product Reference Manual

Page: 133 / 188

MAXIMUM LINE SPEED AND EXPOSURE TIME CALCULATIONS
PRODUCT REFERENCE GUIDE 119
Likewise, T
exp (max)
is the maximum Exposure Time value that can be used without blur-
ring for the given application line speed and code resolution. Therefore:
X / LS = T
exp (max)
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.
For example, the maximum target speed in the application is also affected by these con-
ditions:
• 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 ele-
ments.
• Tilt Angle : maximum speed decreases when increasing Tilt angle (from 0 to 45
degrees).
The Internal Lighting parameter allows setting the operating mode of the internal light-
ing system. The possible values are:
• Disabled : the built-in LED array is turned off all the time. This option can be useful
if using an external lighting system;
• -Power Strobed : the built-in LED array is on only during the image exposure time.
Different Power Strobed lighting levels can be set.
NOTE
To avoid LED array overheating, for Power Strobed settings, the program
automatically limits the range of allowed values for the Exposure Time
parameter. Therefore, after changes to Internal Lighting, recheck Expo-
sure Time.