Usable Scan Length - Symbol MINISCAN MSXX04 Integration Manual

8 - 8 Symbol MiniScan MSXX04 Series Integration Guide
Symbol MS954 Decode Distances
Table 8-3
Symbol Density/
p/n / Bar Code Type/
W-N Ratio
5 mil
64-17453-01
Code 39; 2.5:1
7.5 mil
64-17452-01
Code 39; 2.5:1
13 mil
64-05303-01
100% UPC
20 mil
60-01429-01
Code 39; 2.2:1
40 mil
64-17457-01
Code 39; 2.2:1
55 mil
64-17458-01
Code 39; 2.2:1
Notes:
1. Contrast measured as Mean Reflective Difference (MRD) at 650 nm.
2. Near ranges on lower densities (not specified) largely depend on the width of the bar code and
the scan angle.
3. Working range specifications at ambient temperature (23°C), pitch=15°, roll=0°, skew=0°,
photographic quality, ambient light<200 ft-c.

Usable Scan Length

The decode zone is a function of various symbol characteristics including density, print contrast, wide-to-narrow
ratio, and edge accuracy. Consider the width of the scan line at any given distance when designing a system.
Calculating the Usable Scan Length Method (Symbol MS954 Only)on page 2-9
usable scan length. The scan angle is provided in the usable scan length diagram on
Typical Working Ranges
Bar Code Content/
1
Contrast
ABCDEFGH 0.7 in.
90% MRD 1.8 cm
ABCDEF 0.9 in.
90% MRD 2.29 cm
12345678905 0.9 in.
90% MRD 2.29 cm
123 Note 2
90% MRD
AB Note 2
90% MRD
CD Note 2
90% MRD
Near Far
7.3 in.
18.54 cm
12.3 in.
31.24 cm
22.0 in.
55.88 cm
27.5 in.
69.85 cm
28.0 in.
71.12 cm
35.0 in.
88.90 cm
Guaranteed Working
Ranges
Near Far
1.6 in. 4.8 in.
4.06 cm 12.19 cm
1.4 in. 8.8 in.
3.56 cm 22.35 cm
1.1 in. 15.7 in.
2.79 cm 39.88 cm
Note 2 22.0 in.
55.88 cm
Note 2 23.0 in.
58.42 cm
Note 2 29.0 in.
73.66 cm
describes how to calculate the
page 2-9.