Canon imageFORMULA DR-C225 II, Руководство пользователя

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Select the [Double Feed Detection] check box, and then select any one of
[Detect by Ultrasonic], [Detect by Length], and [Detect by Ultrasonic and
Length].
When you want to scan a document placed
upside-down
Select the [Upside-down feeding] check box on the [Feeding] tab if you
want to insert documents into the scanner upside-down (i.e., with the top
edge of the document facing down).
Even if [Detect by Ultrasonic] or [Detect by Ultrasonic and Length]
is selected, a double feed may not be detected if the document is
small.