Sekonic SR-3500 Operating Manual page 122

Mark to mark type
If paper has pre-printed timing marks, the scanning area (reading area) of targeted
mark frames will be determined by such timing marks.
Mark to mark type is a method to read zones between two timing marks.
Therefore, the number of timing marks in mark to mark type forms is always an
even number. Other methods include timing control type, direct under type, and
FACOM type.
• Mark to mark type
(without top-end margin reading):
The reading zone is the area between timing marks.
• Mark to mark type
(with top-end margin reading):
The reading zones are the front margin of the form
as the first row, and between timing marks as the
second and subsequent rows.
Double-feeding
Refers to two or more sheets being fed at the same time during paper feeding
operation. If such an error occurs, the device assesses it as a paper feeding error,
and notifi es users of the error.
Form
(1) OCR paper (optical character recognition paper)
Paper for data processing to optically read letters and symbols. It should
not be dusty, and it should be smooth, stiff, abrasion resistant, and
antistatic.
JIS X 9004 (printing specifi cations for optical character recognition)
(2) Quality paper
Paper made from pure chemical pulp. Used for printing and writing.
JIS P 3101 (printing paper)
(3) Paper weight
Paper is categorized by weight.
Reading zone
Between timing marks
2.5mm
Reading zone (first row)
Top margin
Reading zone
(second and subsequent rows)
Between timing marks
JIS P 3201 (writing paper)
OMR glossary
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