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Chapter 3
26
Chapter 3
27
symbol. It affects both the density and the size of the barcode that can be decoded.
Near Field (NF): The nearest eld of the LH2’s two image elds. The Near Field has the
highest resolution (1024 x 640 DPI). It has an optimal focal point of 4” (101.6 mm) away
from the lens of the reader. It has a size of 8.5” long (215.9 mm) by 4” wide (101.6 mm).
It has an overall viewing angle of 21° x 12°.
Far Field (FF): The farthest eld of the LH2’s two image elds. The Far Field has the
lowest resolution (480 x 320 DPI). It has an optimal focal point of 9” (228.6 mm) away from
the lens of the reader. It has a size of 4” wide (101.6 mm) at the optimal focal point.
Frame Rate: The number of decode attempts in a given amount of time.
Decode Try Time: The speed of decoding a given symbol. The time of decoding is
dramatically affected by the number of attempts at decoding images (frame speed)
available. An attempt includes the time used in the photographic exposure of an image,
and includes the transfer of the image to the CPU and the time taken to analyze the image,
locate a symbol, and decode the symbol into data or abandon the attempt because no data
could be derived.
There are four different Optimization Matrix available.
1) Right & Left Key Optimization
2) Left Key Optimization
3) Right Key Optimization
4) Continuous Trigger Optimization
You can use any of the options to ne tune the scanning performance of the LH2 to t your
application.