Multifeed Detection Conditions - Fujitsu ScanSnap N1800 Operator's Manual

A.5 Multifeed Detection Conditions
There are three multifeed detection modes: document layer, document length, and both
document layer and length.
To detect multifeeds with document layer, document length, or both document layer and
length, specify [Ultrasonic], [Length], or [Both], in
The following conditions must be satisfied in each of these detection modes.
Detection by Layer
Set sheets of the same thickness in the ADF paper chute for a series of scans.
Paper weight: 52 to 127 g/m
Punched holes are not allowed within 25 mm (0.98 in.) either side of the center of
paper.(*)
Do not glue on any other paper within 25 mm (0.98 in.) either side of the center of
paper.(*)
(*): Refer to
Detection by Length
Set sheets of the same length in the ADF paper chute for a series of scans.
Document length deviation: 1% or less
Punched holes are not allowed within 25 mm (0.98 in.) either side of the center of
paper.(*)
(*): Refer to
Detection by both Layer and Length
Set sheets of the same thickness and length in the ADF paper chute for a series of
scans.
Document thickness: 52 to 127 g/m
mm)
Document length deviation: 1% or less
Punched holes are not allowed within 25 mm (0.98 in.) either side of the center of
paper.(*)
Do not glue on any other paper within 25 mm (0.98 in.) either side of the center of
paper.(*)
(*): Refer to
ATTENTION
Multifeed detection by layer will always mis-detect thick paper as a multifeed error.
When scanning such documents, select [None] on the [Multifeed Setup] window.
Multifeed detection rate may decrease depending on the document condition.
Multifeed may not be detected for the top and bottom 30 mm of a document.
"A.4 Area not to be Perforated or Affixed with Other Papers" (page
"A.4 Area not to be Perforated or Affixed with Other Papers" (page
"A.4 Area not to be Perforated or Affixed with Other Papers" (page
"6.9.19 Multifeed Detection" (page
2
(14 to 34 lb) (45 to 110 kg/ream) (0.06 to 0.15 mm)
2
(45 to 110 kg for 1,000 sheets) (0.065 to 0.15
420
333).
419).
419).
419).