Some scanners can be set to detect when more than one sheet of paper enters the scanner through the document feeder. If you have such a scanner, you can base your form definitions on scanner settings that take advantage of this.
One way of detecting this double feeding is by checking the thickness of the paper.
In the ISIS scanner settings dialog, select Double feed detect and Thickness.
If you select Thickness, the scanner must be set (calibrated) to expect the thickness of the paper to be scanned. The two ways of doing this are explained below. Use the method that is most convenient for you.
How long the calibrated thickness remains in effect depends on the scanner. Normally it remains in effect until the next time you perform a calibration, even if the scanner is turned off. Check the scanner’s instruction manual to confirm how calibration results are saved.
Note that while the Double feed detect and Thickness settings are saved with the form definition, the calibrated thickness is not. This means that you can process the same form definition, but printed on papers of different thickness, by recalibrating the paper thickness each time it changes.
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Scanners that calibrate paper thickness fall into two categories:
Calibrate paper thickness is intended for use with scanners that fall into the first category. However, the option is not disabled if your scanner falls into the second category. If you have that kind of scanner, selecting Calibrate paper thickness does not work. If you are not sure whether your scanner is a model that lets you manually feed an extra page for calibration, check your scanner documentation before selecting Calibrate paper thickness. |