Microscan MS-4X Manual de usuario Pagina 289

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Formulas for Number of Decodes
MS-880 Industrial Long Range Scanner User’s Manual A-33
Appendices
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:
1
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.
Improving the Number of Decodes
After changing any of the parameters described in this section, recalculate the number
of decodes.
Scan Rate
Scan rate is a function of motor speed and is adjustable. A slower scan rate may allow
greater label range and/or higher decode rates, but at the cost of fewer scans per
label.
Range
Adjusting the labels range, if possible, is one of the quickest and most effective ways
to improve decode rates. However, in some applications you may need to select a less
than optimum range, or one that is beyond the fringes of the ranges.
Scan Width
Increasing scan width will increase the number of scans in a picket fence oriented
application. Scan width is linked with scan range and changing one will usually require
a change in the other.
Direction of label travel
Scan Line
Figure A-9 Picket Fence
SW LL()
LS
---------------------------
DR×


3 number of complete decodes=
LL 2 inches (including quiet zones)=
LS 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-10 Angled
Picket Fence
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