Manual No. | LPN5627 / LPR5627 Laser Fixed Mount |
Scanner |
|
Section 3
Positioning the Scanner
Achieving Optimum Performance
Three items greatly impact performance:
1)Distance (from the scan window) to the bar code
2)Specular Reflection
3)Quality of Bar Code Labels
1)Distance to the Bar Code
The operation of the scanner is similar to a camera. If you photograph an object that is out of focus, the resulting picture will be blurry. The same is true with the scanner. If the bar code label is out of focus, the scanner may have difficulty decoding what appears to be fuzzy bars and spaces.
Focal Distance
Ideally, the distance from the window of the scanner to the bar code label should be equal to the focal distance of the scanner. For the LPN5627 / LPR5627 fixed position scanners, the nominal focal distance is approximately 4.0” from the front edge of the scanner
Depth-of-Field
Just as with a camera, the scanner has a
The
The following table shows the
|
| Near | Far |
Bar Code Density | Distance | Distance | |
40 mil | (1.00 mm) | 2.3” | 12.6” |
20 mil | (0.50 mm) | 2.3” | 10.8” |
10 mil | (0.25 mm) | 2.3” | 7.0” |
6 mil | (0.15 mm) | 3.5” | 4.7” |
* measured from front edge of scanner
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