Avision FB5000 (BT-1007B) - Manual (Page 58)

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4.6 The Multi-Feed Detection Tab
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.