SIGMA LBA-708 - Manual (Page 49)

3.2 Options... Drop Down Menu Selections
3.2.1 Hide/Show; Capture, Display, Aperture Toolbar
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.
3.2.2 Aperture... display and define apertures
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
49