Printronix SL5000r User Manual page 58

Chapter 2
based on the lowest grade on any scan converted to a single digit grade (A to F, 4 to 0)
which is then averaged. This usually occurs when a single analysis parameter has a
value just above or just below the Overall Grade.
Example
The Decodeability value of 51 displays as B, but the Overall Grade displays as C.
The bar code was scanned five times: three scans had values of 0.49 (grade C) and two
scans had values of 0.54 (grade B).
Also, with certain combinations of multiple analysis parameters and possibly the
truncation used on the analysis parameter's average, the Overall Grade may be higher
than an individual analysis parameter grade.
Example
The Decodeability value of 48 displays as C, but the Overall Grade displays as B.
The bar code was scanned five times: four scans had values of 0.51 (grade B) and one
scan had a value of 0.40 (grade C).
Modulation
NOTE:
Modulation measures how well the scan laser sees the wide elements (bars or spaces)
relative to the narrow elements. In general, scanning lasers see bars better than spaces
and wide elements better than the narrow elements. This menu item sets the value used
by the validator for pass/fail threshold during the analysis of bar codes. Higher values
create a stricter criterion for passing.
You can set the Modulation parameter to a percentage value from 0% to 100%. The
default is 0%.
1. Press
2. If necessary, press and
3. Press
4. Press  until Modulation displays.
5. Press + or – to scroll through the percentage values: 0% to 100%. The default is
6. Press
58
The Decodeability grading calculation is:
(3 x 0.49) + (2 x 0.54) = 2.55
2.55 ÷ 5 = 0.51 (grade B)
The Overall Grade calculation is:
(3 x 2.0) + (2 x 3.0) = 12
12 ÷ 5 = 2.4 (grade C)
The Decodeability grading calculation is:
(4 x 0.51) + (1 x 0.40) = 2.44
2.44 ÷ 5 = .49 (grade C)
The Overall Grade calculation is:
(4 x 3.0) + (1 x 2.0) = 14
14 ÷ 5 = 2.8 (grade B)
This parameter factors into the Overall Grade (page 57).
. .
. to take the printer offline and place the printer in Menu mode.
. .
. until VALIDATOR displays.
0%.

to select the desired value.

at the same time to unlock the

key.