Beta Ultra Dottie II, Operating Manual

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and the device is positioned on a flat and stable surface. Always position
the entire instrument on the sample (the 4 feet and the measuring head).
The measuring device shows the measurement result after a
successful measurement.
You will find the toolbar on the left side of the LCD with
the following functions:
Change to image display for a visual dot inspection
Change to characteristic curve display
Device settings
For regular screening in the display you will find:
DOT xx.x % Measured dot area
Identified screen ruling in lines/cm or lines/inch
Dot diameter in µm (based on a circular dot of the same
surface area), provided that a closed dot was present
Screen angle in °
Visual coverage
Important:
In a regular screen, the screen ruling, dot size and screen angle will always be shown if the dot area has closed dots
(highlights and shadows). The dot size will be displayed if the stochastic screen is set and screen tones < 10% are
measured. This means the laser image quality can be verified easily. These parameters are not shown for middle tones,
especially for chain dots. The visual coverage is a ‘density’ measurement, which is not compatible with any current
standard and can only be used for comparative analysis. For density measurement, we recommend using a Beta
Industries densitometer conforming to standards. Only the dot area is usually determined in stochastic screens. However,
use of image analysis algorithms makes it possible to measure individual dot sizes in stochastic screens as well.