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Appendix M
A-32 MS-880 Industrial Long Range Scanner User’s Manual
Appendices
Raster Picket Fence Calculation
For raster picket fence scanning, the number of decodes
(ND) is calculated in two formulas, one for sweep rate and
the other for number of decodes.
Sweep Rate.
Since the speed of the raster (SwR) cannot exceed 10 you
first need to ensure that you can achieve this by solving for
sweep rate (SwR). Sweep rate is the number of raster
sweeps (up or down) that occur in a second. Sweeps per
second should generally be as few as possible in order to maximize the number of
decodes applied to a given label.
The formula for finding Sweep Rate (SwR) is as
follows:
1
SwR = Sweep Rate, the number of passes, up or
down, that are described by the arc of the raster mirror.
LS = Label Speed, the inches per second that a bar code moves through the scan.
SW = Scan Width, the width across the scan beam, at a given distance from the scan-
ner, in which a label can be read (picket fence formula only).
LL = Label Length, the length of the longest printed label to be read plus the length of
the quiet zones (picket fence formula only).
Example
Important: The maximum sweep rate that your can set the scanner to is 10. If your
solution is greater than 10, you must change another parameter such as label speed,
etc. and recalculate.
Since SwR can only be entered into the software as whole numbers, round off frac-
tions of SwR to the next higher number, for example enter 0.4 as 1 and 3.5 as 4.
Number of Decodes
Number of decodes (ND) for a picket fence bar
code is calculated by the following
formula:
Example:
1. The number 2 in the SPS formula ensures that each label receives two full raster sweeps.
Direction of label travel
Raster pattern
Figure A-8 Raster
Picket Fence
SwR
2LS×
SW LL()
---------------------------=
SW 5 inches=
LS 2 inches per second=
LL 1 inch=
SwR
2
2×
51()
----------------
1==
DR = Decode Rate is the number of
decodes per second.
RH = Raster height
LH = Label height
LH = 1
DR = 900
RH = 10
ND
1 900×
10 1×
------------------ 3 87 decodes ==
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