Fujitsu FI-4860C Operator's Manual page 88

3. Select the detection conditions from [Double Feed Detection] under [ADF
Option].
The following are the detection conditions
None
Check
overlapping
Check length
Check
overlapping and
length
Furthermore, refer to "APPENDIX2 DOUBLE-FEED DETECTION
CONDITIONS" on page AP-2 for detailed information about the document for
double-feed detection.
4. Click the [OK] button.
The display returns to the [TWAIN Driver] dialogbox. Then, perform the
scanning operation on the dialogbox.
2-18 2.5 Detecting Double-Feeds
Double-feed detection is not performed
The scanner monitors for the overlapping of documents. It
detects a double-feed by differences in document thickness
when two or more document sheets are fed overlapped.
The scanner monitors the length of documents. It detects a
double-feed by differences in the document length when two
or more document sheets are fed overlapping.
The scanner monitors both document overlapping and
length to detect double-feeds.