Operating Instructions
Chapter
6
CLV 490 Bar Code Scanner
8 008 796/0000/25-06-2002
©
SICK AG · Division Auto Ident · Germany · All rights reserved
6-13
Operation
Note
The O
SCILLATE
WITH
VARIABLE
A
MPILTUDE
operating mode can only be selected from amplitudes
of min.
±
10 CW and an oscillating frequency of 0.4 Hz or higher.
The scan line must always sweep the neutral position (CW = 50). This means that oscillation
is not possible in the range 60 CW to 80 CW, for example, but is possible in the range 40
CW to 80 CW.
Explanation of oscillating mirror functions
1.
"Oscillating with fixed amplitude" mode
The oscillating mirror deflects the scan line up to the maximum angle of deflection of
±
40 CW (corresponds to
±
20
°
).
illustrates this mode when a bar code is read from
above.
2.
"Oscillating with Variable Amplitude" mode
The deflection range can be parameterized separately for each of the maximum of 8 di-
stance configurations/focus positions. The minimum/maximum values that can be set for
the deflection range for fast applications ensure that the scan line only sweeps areas that
contain bar codes during the time available. This also ensures that the scan line density on
the object is, for the most part, constant.
bar code is read from above.
Fig. 6-3:
Oscillating mirror: "Oscillating with fixed amplitude" mode
0
0
Constant
oscillating
frequency
Scan line density depending on object height