Datalogic AV7000, Reference Manual

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IMAGING FEATURES
257
5
Adjusting the Focus (Far Working Distance (Z) )
The Far Working Distance must be adjusted to read an equal number of step ladder and
picket fence barcodes on the
Picket Fence/Step Ladder Test Chart.
1. Place the
Picket Fence/Step Ladder Test Chart on the test box. The first part of the
data of the barcode indicates the mil/mm size of the narrow element.
Figure 119: Picket Fence/Step Ladder Res Test Chart barcode example
2. Run a box with the
Picket Fence/Step Ladder Test Chart through the system. The goal
is to have the same number of picket fence and ladder barcodes decoded. In the
following example, there are more barcodes decoded in one orientation than the other.
This indicates that the camera is not focused correctly.