910-269-EN, Rev. B, June 2011
212 Chapter 11
Figure 11-14 Completed custom DAC
Once the custom DAC curve points have been captured and completed, you have full
capability to toggle between DAC and TVG views, to manipulate Range, Delay, CAL
Zero, and Angle, and also to add necessary scanning gain, curve gain adjustment or
transfer correction. The TVG view of any custom DAC curve includes the user-
defined reference curves as well as the primary DAC curve. Custom DAC curve also
incorporates the reference correction functionality, if desired.
11.2.7 20 % - 80 % DAC
The 20 % - 80 % DAC function incorporates a combination of the DAC curve and TVG
techniques. For most sizing and inspection codes that use a DAC curve, the inspector
cannot interrogate a potential defect that does not rise above 20
% FSH. In the past,
scanning gain was added to inspect these defects that appear further into a part and
only reflect below 20
% FSH. The necessary gain adjustment was then noted to
calculate the flaw size.
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