Sekonic SR-1800 Operating Manual page 47

SR-1800
Timing control type
If the sheet 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 and mark to mark 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: • Top-end timing control type:
Reads n times the width of a timing mark Reads n times the width of a timing mark
from the beginning of the timing mark. from the beginning of the timing mark.
• Bottom-end timing control type: • Bottom-end timing control type:
Reads n times the width of a timing mark Reads n times the width of a timing mark
from the end of the timing mark. from the end of the timing mark.
Sensor (for reading) Reading sensor/position sensor
Sensors are photoelectrical elements that transform reflected light. Sometimes sensing refers to
both light emission and light reception.
LED wavelength influences dropout color. We use mainly two wavelengths, and the relationships
between wavelength, dropout colors, and readable colors are shown in the table below.
Wavelength
940nm Infra red
660nm Visible light (red)

Color
Colors other than readable
colors
Red, orange, pink
... ...
... ...
... ...
... ...
... ...
... ...
... ...
Dropout color
Black and blue pigments
Black, blue
Reading area Reading area
N times the width of N times the width of
a timing mark a timing mark
Reading area Reading area
N times the width of N times the width of
a timing mark a timing mark
Readable color