RJS Inspector D4000 SP (FIRMWARE version A.06 and Later) - Manual (Page 74)

Appendix K Operator
’s Guide
RJS, Minneapolis, MN 002-5572
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 af-
fect reflectance.
Space
The element of a bar code symbol whose reflec-
tance 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
information.
Substrate
The material (paper, plastic, metal, etc.) upon
which a bar code symbol is
“printed” or reproduced.