Sekonic SR-3500 Operating Manual page 118

Timing control type
If paper has pre-printed timing marks, the scanning area (reading area) of targeted
mark frames will be determined by such timing marks.
Timing control type is a method to determine the reading zone based on the
timing mark width. Other methods include direct under type, mark to mark type,
and FACOM type.
Example: Timing control type to scan three times the timing mark width.
Set multiple numbers using the software controlling OMR.
• Top-end timing control type:
Reads n times the width of a timing mark
from the beginning of the timing mark.
• Bottom-end timing control type:
Reads n times the width of a timing mark
from the end of the timing mark.
Sensor (for reading) Reading sensor/position sensor
Sensors are photoelectrical elements that transform refl ected light. Sometimes
sensing refers to both light emission and light reception.
LED wavelength infl uences dropout color. We use mainly two wavelengths, and
the relationships between wavelength, dropout colors, and readable colors are
shown in the table below.
Wavelength Color
940nm Infra red
660nm Visible light (red)
Sorter
On a device with two or more stackers, this is a unit that can sort paper based on
information such as kind of paper and written marks.
Dropout color
Colors other than
Black and blue pigments
readable colors
Red, orange, pink
OMR glossary
Reading area
N times the width of
a timing mark
Reading area
N times the width of
a timing mark
Readable color
Black, blue
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