Fujitsu fi-5950 Operator's Manual page 207

HINT
Setting Example 1:
Left, Disable, Start=50 mm, End=200 mm
Middle, Enable, Start=50 mm, End=200 mm
Right, Disable, Start=50 mm, End=200 mm
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8.4 Multifeed Detection
When both "Start" and "End" positions are set to 0 (zero), a multi feed error
will be detected over the whole area, regardless of the setting of "Enable"
or "Disable".
If you wish to deactivate the detection for all of the areas, please select
"Disable" and set "Start" to 0 (zero), while choosing a value greater or
equal than the document length for "End".
If "Start" is set to a value beyond the size of a document, the detection
area is as follows:
When "Disable" is selected: The whole area of the document is the
detection area.
When "Enable" is selected: Multi feed detection is disabled.
For the multi feed detection, it is necessary to specify the range for the
length to at least 5 mm.
Please perform the setting for the detection area so, that following condi-
tion is met:
["End:" position] - ["Start:" Position] ≧ 6mm
You can also specify the check area by the following other methods.
By dragging the mouse on the setting area window to create
rectangular
By moving the edge grip at Start or End in the setting area
Unit: mm