Sekonic SR-1800 Operating Manual page 53

SR-1800
(8) Clear zones
Do not print in colors other than dropout colors 0.8mm around reading zones and 0.8mm
from timing mark longitudinal ends.
Reading zone:
The vertical direction of the data mark standard position is the height set by command, and
the horizontal width refers to the area of the data mark frame width.
Dropout colors:
Dropout colors refers to colors that are already printed or written on a document that can be
seen by human eyes but cannot be recognized by a reading sensor.
(9) Black ink printing
Descriptions, etc. can be printed in areas except print prohibition zones and clear zones.
0.8 0.8 3.5 3.5
Timing mark Timing mark
Reading zone Reading zone Clear zone Clear zone
However, never print anything at PCS 0.15 or more other than timing marks in timing mark
columns from the top edge of sheet to the bottom edge on either side of the sheet.
(10) Printing on back surface
You can print on the back surface except in print prohibition zones. However, do not print
at PCS exceeding 0.15 in clear zones on the front surface in case of bleeding through from
the back.
(11) ID mark
Set an ID mark for identification as necessary.
Size:
Reading darkness: PCS 0.8 or higher
Angle:
(12) Mark frame (Reading mark size)
Rectangles, ovals, and circle shapes have been conventionally used for mark frames.
Frame size should be smaller than the reading zone in various reading methods (direct under
type, timing control type and mark to mark type).
Recommended sizes are as follows.
Rectangles: Vertical 0.5-1.5mm
Ovals: Vertical 1.5-2.5mm
Circles: O 3.0-3.5mm
*Maximum horizontal length differs depending on sensor pitch.
Adjust horizontal length = (sensor pitch - 0.7mm) or less.
*Printing color: print at PCS 0.15 or less in dropout color.

0.8 0.8
0.8 0.8
Reading zone specified Reading zone specified
by command by command
0.8 0.8
[Unit: mm] [Unit: mm]
1.0mm or longer x 3mm or longer.
±5 degree or less (against the line perpendicular to the standard side)
Horizontal 3-3.5mm
Horizontal 3-4.3mm
3mm or longer 3mm or longer
1.0mm 1.0mm
or longer or longer