2755-ld4 usable beam length (a,b,c ranges), A,b,c ranges) – Rockwell Automation 2755 High Performance VLD Scanner User Manual
Page 19

3–6
Installation Considerations
Figures 3.6 and 3.7 show the Usable Beam Length versus Distance
for the LD4 scanners. The black area is a no read area. The Usable
Beam Length (bottom of chart) is compared to the Reading Distance
(top of chart). The Usable Beam Length is approximately 20% less
than the projected beam length (10% on each end of the scan line).
The reading distance is measured from the scan window to the center
of the symbol.
Figure 3.6
LD4A, B, C Usable Beam Length ➀
4.9
12.4
8.1
20.6
11.4
28.9
14.6
37.1
17.9
45.4
21.1
53.7
24.4
61.9
27.6
70.2
30.9
78.4
Inches
Centimeters
Usable Beam Length (Nominal)
NA
NA
5
12.7
10
25.4
15
38.1
20
50.8
25
63.5
30
76.2
35
88.9
40
101.6
45
114.3
Inches
Centimeters
NA
NA
LD4A, B, C Reading Distance
Usable
Beam
Length
= Catalog No. 2755-LD4A, B, C
= No Read Area
Reading Distance
➁
50
127.0
34.1
86.7
➀ Usable Beam Length for LD4A, B, C Scanners = 0.65 x (Reading Distance + 2.5 inches)
Measured from the scan window to the center of the bar code symbol.
➁
2755-LD4
Usable Beam Length
(A,B,C Ranges)