Opticon NFT 1125 - Manual (Page 13)

Manual No. 25-NFT1121-01
Series NFT-1121/2135 Mini CCD Fixed Position Scanners
Section 3
Positioning the Scanner
Getting 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 NFT-1125/2135 Series fixed position scanners, the nominal focal distances
are:
1126 Side View 0.50 inches (mm)
1127 Front View 0.30 inches (mm)
2126 Side View 1.43 inches (36.5 mm)
2127 Front View 1.28 inches (32.5 mm)
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