
Formulas for Number of Decodes
A-28 MS-9 Scanner User’s Manual
Single Scan Line Picket Fence Calculation
For single scan line picket fence scanning (Top Offset setting equal to Bottom Off-
set), use the following formula:
Example:
Angled Picket Fence Calculation
The number of complete scans for angled picket fence is
calculated the same as that for picket fence, with the
exception that the scan width is shortened in proportion
to scan tilt.
Direction of label travel
Scan
Line
Figure A-10 Picket Fence
ND
SW SL–
()
SS
--------------------------
DR×
⎝⎠
⎛⎞
3–=
ND = Number of Decodes (total per symbol)
SW = Symbol Width
SL = Symbol Length
SS = Symbol Speed
DR = Decodes rate.
SL 2 inches (including quiet zones)=
SS 100 inches per second=
SW 4 inches=
DR 1000 decodes per second=
42–()
100
----------------
1000×
⎝⎠
⎛⎞
3– 17 complete decodes=
Direction of label travel
Scan Line
Figure A-11 Angled
Picket Fence
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