Microscan MS-810, User Manual

Page: 116 / 144

Chapter A
A-18
MS-810 Industrial Scanner User’s Manual
A
p
p
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ndice
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Appendix G — Number of Scans
To ensure reliable scanning, apply a minimum of five scans to each label. Use the for-
mulas below to calculate the number of scans that your label will receive. For definitions
of terms, see
“Definitions” on page A-19 .
If the number of scans you derive from one of these calculations is less than the mini-
mum for your application, plug in the minimum number of scans (5) and solve for
another parameter that might be changed, such as label speed or scans per second.
Ladder Calculation
1
Example 1:
Picket Fence Calculation
1
Example 2:
1. The -3 component in the formula is included to allow for AGC acquisition, an incomplete first
scan, and an incomplete last scan. This applies only if the number inside the parentheses equals
4 or more. If the number equals 3, then only subtract 2 to derive 1 good scan.
Scan line
(full width)
Direction of label travel
Label
Label
placement
area
Figure A-4 Ladder Orientation
LH
LS
-------- SR ×
 
 
3 – number of complete scans =
Where LH Label Height, LS Label Speed, and SR Scan Rate. = = =
LH 1 inch =
LS 10 inches per second =
SR 500 scans per second =
1
10
------ 500 ×
 
 
3 – 47 complete scans =
SW LL –
( )
LS
--------------------------- SR ×
 
 
3 – number of complete scans =
Scan line
Label
placement
area
Direction of label travel
Figure A-5 Picket Fence
Orientation
Where SW Scan Width, LL Label Length, = =
LS Label Speed and SR Scan Rate = =
LL 2 inch (including quiet zones) =
LS 10 inches per second =
SW 8 inches =
SR 500 scans per second =
8 2 –
( )
10
---------------- 500
×
 
 
3 – 297 complete scans =