Microscan MS-890, User Manual, Page: 293 / 308

MS-890 In dustrial Automation Scanner User Manu al
A-29
Appendices
Number of Decodes
Note: Because adjustable raster sweeps and scan speeds cannot be synchronized, some
variation in raster height should be anticipated.
Number of decodes (ND) for a raster picket fence symbol is calculated by the following formula:
Example:
Raster Height
If raster arc (in degrees) and symbol range are known, raster height can be derived by the
following formula, where Ø is raster arc in degrees:
1
Raster Arc
If raster height and symbol range are known, then raster arc Ø can be derived by using the
following formula where RH is raster height:
Note: Raster arc is not presented in degrees in ESP . To convert to degrees, add the Top
Offset to the Bottom Offset and subtract the sum from 255. Enter this as the offset in the
following formula:
ND
= Number of Decodes (total applied to each symbol)
SH
= Symbol Height
DR
= Decode Rate
RH
= Raster Height
SPS
= Sweeps per Second