I.R.I.S. IRIScan Pro 3 Cloud Button Manager - Manual (Page 30)

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Additional Length Detection
Additional Length Detection allows you to define the length of
document being multi-fed. This value indicates the additional
length exceeding your designated scan area. The Display
window will show the size of the document as you change the
value. A value of 0 indicates no additional length detection.
The Additional Length Detection is best used when scanning
same-size documents in the auto document feeder.
Ultrasonic Detection
Ultrasonic Detection allows you to set overlapped document by
detecting paper thickness between documents. Note: the
availability of the function varies based on type of scanner.
There are two options available if Multi-Feed is detected.

Stop Scanning after Multi-Feed
If this is selected, the scanner will stop the feeder if
multi-feed is detected.
If this is selected, the scanner will stop the feeder and
display the following Warning dialog box if multi-feed is
detected.
Action:
1. Follow the instruction on the Warning dialog box to
remove the rest pages on the feeder.
2. Click OK to close the Warning dialog box.
3. Scan the rest pages.