Avision FB6080E (DT-0602S) - Manual (Page 47)

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Choose “Unlimited” if you have a batch of long page
document with unknown length. Choose “Enter Length” to
enter the length and width of your documents or your
desired scan size on documents. This is useful when you
have a batch of documents with the same scan size or a
batch of same-sized documents.
OverScan
Overscan allows you to add a specific margin at top and
bottom or right and left (Options vary based on the type of
scanner) of the edge of the image. This is used to reduce
possible corner clipping on the skewed images and often
applied to a batch of skewed document to be scanned in
the auto document feeder. Select a value between 0 and
+5 mm. Note the overscan result will not be shown in the
Display window and that the availability of the function
varies based on type of scanner.
Multi-Feed Detection
Multi-Feed Detection allows you to detect overlapped
document that go through the auto document feeder.
Multi-Feed usually occurs due to stapled documents,
adhesives on documents, or electro-statically charged
document. Note： The availability of the function varies
based on type of scanner.
Additional Length Detection
Additional Length Detection allows you to define the length
of document being multi-fed. This value indicates the
additional length exceeding your scan area. The Display
window will show the size of the document as you change
the value. A value of 0 indicates no additional length
detection. The Additional Length Detection is best used
when scanning same-size documents in the auto document
feeder.