DMTA-10055-01EN, Rev. A, February 2015
Software Features and Options
269
lower gain setting for any signal loss, while still scanning the remainder of the test
piece at a high gain level for small defects.
• In the second form of inspection (similar to the first), the BEA is used in porosity
inspections. Porosity tends to scatter sound instead of returning a clear echo. In
this situation, back wall amplitude may be the only way to positively differentiate
porosity from material grain structure. The BEA is used to display the entire back
wall signal on the screen so that it can be closely monitored.
Both inspection forms are useful when detecting very small defects.
To activate the BEA
1. Choose the Gate2 menu item (group 2/5).
2. Press Status (P7 key) then select BEA.
When the BEA is activated, gate 2 is on and displayed in its previous position.
Figure 11-31 Activating the BEA
Operating the BEA
The BEA option displays an independent back wall gain in the BEA Gain parameter
(P6 key). This control replaces the Gate 2 Min Depth parameter while BEA is active.
This gain is applied within the screen range after the start of gate 1.
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