NCR 7890, Руководство пользователя

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Operating Your 7890 Scanner
Label Orientation
4-8 User’s Guide
For optimum reading, the distance that you must place
the label from the 7890 Scanner depends on the density
and height of the bar code. You can relate this to
focusing a camera, where you change the focus setting
based on how far away the object is.
Depending on the label, reading can range from zero to
six inches. Therefore, when you use your scanner, move
the label toward the scanner to a comfortable distance in
front of the scan window (approximately three to four
inches) and hold the item momentarily. Normally the
"Good Read" indication occurs within one fourth of a
second. If this does not happen, try moving the label a
little closer to the scanner.
Distance from
Scanner