RJS Inspector D4000 Auto Optic (FIRMWARE version A.06 and Later) User Manual
Page 81
Operator
’s Guide
Appendix K
002-5564
RJS, Minneapolis, MN
73
A bar code or symbol that uses a checking algorithm
that can be applied to each character, to guard
against undetected errors. (Non-self-checked codes
may use a check digit or other redundancy in addition
to the data message).
Show-through
The generally undesirable property of a substrate
that allows underlying markings of materials to affect
reflectance.
Space
The element of a bar code symbol whose reflectance
is greater than the global threshold. A Space is the
light reflective element. (As opposed to a bar which
is the dark reflective element.)
Space Reflectance (Rs)
The largest reflectance value in a space or quiet
zone.
Specular Reflection
Reflection of light from a surface at an angle equal
and opposite to the angle of incidence.
Start and Stop Characters
Characters typically used at the beginning and end of
each bar code symbol.
Substitution Error
This error can be seen in a mis-encodation, mis-read
or human operator error where characters that were
to be entered were substituted with erroneous infor-
mation.
Substrate