Scan Line Separation; Data Storage Requirements - Ametek LAND LSP HD Series User Manual

User Guide
6.3 Scan Line Separation
When you have determined the required scan frequency, choose the scan rate that
either closely matches or exceeds the required rate.
It is not good practice to simply select the scanner's maximum scan rate regardless of
process requirements. The reasons for this are outlined below:
Parameter

Scan line separation

Lateral resolution
Disk space for file storage
Processor requirements

6.4 Data Storage Requirements

Data is generated at a rate of approximately 2.5 kB per scan line, with a minimum
requirement of 440 kB for file headers. Therefore, at a scan frequency of 50 Hz, each
one minute measurement period will require 7.94 MB of data storage space.
Landscan WCA software allows you to select a reduced number of lines for storage (see
the Landscan WCA Software Online Help).
Product speed m/s or ft/s
Scan line separation
Scan Line Separation = Product Speed
High Speed
Closely spaced
Lower resolution
Greater space required
Higher
m / ft
Scan Frequency
Low Speed
Widely spaced
Higher resolution
Less space required
Lower
LSP Linescanner Head
HD
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