Sigma LBA-708 Manuale Utente

 

The above three toolbars can be selectively displayed or hidden based upon operator preference.  

Check the action that applies. 
The Capture and Display toolbars can be user defined to match the operators needs. 
The Aperture toolbar is predefined and can not be altered by the operator. 

The LBA-PC can display three types of apertures in four different shapes.  The three types of 

apertures are: 

•  Drawn:  You can manually draw a WHITE aperture for the purpose of isolating beam 

analysis to the pixel data contained within the aperture.  This feature allows you to eliminate 

the effects of noise or stray energy in regions outside of the beam under test. 

•  Displayed:  The BLACK displayed aperture is not really an aperture.  Rather it is an 

overlaid graphical representation of the computed shape and size of the beam 
width/diameter results.  This BLACK aperture provides a way for the user to visually see the 

beam width, and observe how it changes. 

•  Auto:  This feature automates the task of drawing an optimally sized and placed aperture 

around the beam profile being measured.  This aperture is displayed in YELLOW.  It 

performs the same function as the Drawn aperture, except that it will continuously resize 

itself to changing beam conditions.   

All three of the above apertures can be enabled and visible at the same time on a 2D display.  In the 
3D display mode no apertures are ever displayed, however the Drawn and Auto apertures can be 

operating as described above.  If you’ve enabled the apertures while in the 3D display mode, be sure 

to check their setup in the 2D display mode. 
The Drawn and Auto apertures, when operating at the same time, function in the following manner: 

•  First, the Drawn aperture isolates the energy for analysis. 
•  Second, an Auto aperture is computed and drawn around the beam energy. 
•  Third, the reported beam widths/diameter is computed based upon the energy contained 

exclusively within the Auto aperture. 

 

3.2.2.1  Aperture Shapes   

Drawn and Displayed apertures can be rendered in four shapes. 

•  Circle 
•  Square 
•  Ellipse 
•  Rectangle 

Auto apertures are always rendered as an Ellipse. 

Operator’s Manual 

 

LBA-PC 

 

Doc. No. 10654-001, Rev 4.10 

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