910-269-EN, Rev. B, June 2011
Software Features and Options (Conventional UT Mode) 213
The 20 %-80 % DAC feature takes advantage of the TVG functionality of DAC/TVG to
create a DAC curve that only falls between 20
% and 80 % screen height. Any echo
that falls below 20
% FSH during setup has 12 dB added to it automatically. A new
DAC curve section starting at 80
% FSH is created. This setup divides the screen into
12
dB DAC gain regions. The DAC gain is displayed based on the location of the
gated echo in time.
Figure 11-15 Completed 20-80 DAC
The setup procedure for the 20 %-80 % DAC is the same as the ASME & ASME III
setup described earlier. The only difference is that you cannot use the auto-80
%
function during the setup. The instrument automatically compensates for falling-echo
amplitude once an echo is captured below 20
% full-screen height.
Once the 20 %-80 % DAC curve is completed, you can toggle between DAC and TVG
views, manipulate Range, Delay, CAL Zero and Angle, and also to add necessary
scanning gain or transfer correction. 20
%-80 % DAC also incorporates the reference
correction functionality, if desired.
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