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Chapter
6
Operating Instructions
CLV490 Bar Code Scanner
6-14
©
SICK AG · Division Auto Ident · Germany · All rights reserved
8009993/RA61/2007-07-20
Operation
Note
At a scanning frequency of 1,000 Hz, the typical response time for focus adjustment is
20 ms, or 30 ms if the entire range (between min. and max. focus position) is traversed.
The CLV490 does not switch over the focus until the defined timeout has elapsed and the
new focus position exceeds the parameterized hysteresis value relative to the old focus
position. If the new focus position is within the hysteresis, the CLV490 does not switch over
the focus.
Depth-of-field optimization with respect to the object and the purpose of depth-of-field
Chapter 3.2.1 Autofocus function, Page 3-7
.
2. Configure autofocus
Additionally for autofocus mode "Differential background“ ’
and „Differential background and tracking“:
Ö
A
UTOFOCUS
S
PACE
section
– Right edge of conveyor (Y 1)
– Left edge of conveyor (Y 2)
– Level of conveyor (Z 1)
– Maximum scanning height (Z 2)
Ö
A
UTOFOCUS
O
PTIMIZATION
P
ARAMETERS
button
Ö
D
ELAY
OF
F
OCUS
C
HANGE
section
– Timeout
– Hysteresis
Ö
D
EPTH
OF
FIELD
O
PTIMIZATION
section
– Offset at minimum
– Offset at maximum
Ö
"Distance measurement" section (default setting)
–
active
– Source of distance information: internal/external
– Smooth filter: active, length 3
3. Teach-in background
(optional)
For autofocus mode "Differential background“ and „Differential
background and tracking“:
Ö
Menu CLV490
Ö
D
EVICE
FUNCTIONS
Ö
Background
– Teach-in
Check taught-in background:
Ö
R
EADING
C
ONFIGURATION
tab
Ö
A
UTOFOCUS
section
Ö
S
HOW
BACKGROUND
2)
button
Displaying online the actual background profile with focus level
points:
Ö
Menu CLV490
Ö
B
ACKGROUND
A
NALYSIS
– Analysis: Autofocus
4. Select focus position
switchover (refered to the
start of the reading interval)
Ö
R
EADING
C
ONFIGURATION
tab
Ö
F
OCUS
C
ONTROL
section
Ö
I
NPUTS
/S
ERIAL
/A
UTOFOCUS
– immediate or synchronous (default setting)
or
– latched
2) The CLV490 displays the taught-in background with the internal correction of 100 mm (3.9 in) but not the parameterized
limits of the autofocus space.
Action
Settings in CLV-Setup
Table 6-6: Guide: Configuring the autofocus function (part 1) (contd.)
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