Sekonic SR-3500 Operating Manual page 121

OMR glossary
Writing implements
Readable marks and unreadable marks depend on the writing instruments used.
This can also differ according to the light source that the reading sensor uses.
Relationships between sensors used for OMR (light source) and writing implements
Light source
Color tone
wavelength
940nm Infra red
(standard)
660nm Visible light Color: black, brown, blue,
(red)
(*Option)
"FACOM" type
If paper has pre-printed timing marks, the scanning area (reading area) of targeted
mark frames will be determined by such timing marks.
FACOM type refers to a method of determining the reading zone based on a pair
of start timing and stop timing marks. Other methods include timing control type,
direct under type, and mark to mark type.
Start timing
Stop timing
Hopper
A place to put sheets to be processed for marking and compilation.
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Readable mark colors
and writing implement
Color: black (pigment)
Writing implement: pencil
green, purple
Writing implement: pencil,
fountain pen,
water/oil base ballpoint pen,
water/oil base marker
Timing mark
Mark frame
Unreadable mark colors
and writing implement
Color: other than black
Writing implement: other than pencil
Color: red, orange, yellow
Writing implement:
items in above colors
Reading zone