Fujitsu ScanSnap N1800 Operating Manual page 103

2. Set the area for multifeed detection in the [Ultrasonic Multifeed Detection
Zone] section.
Starting from the top edge of a document sheet, set the area to be checked for
multifeeds.
Multifeed may not be detected for the top and bottom 30 mm of a document.
3. In Step 2, if [Middle] or [Top & Bottom] is selected, enter both "#1" (upper
limit) and "#2" (lower limit).
Middle
Multifeeds will be detected within "#1" (upper limit) and "#2" (lower limit) set. (a)
Up to 510 mm
Outside of multifeed
detection area
103
25 mm
#1
(a)
Center of paper
#2