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910-269-EN, Rev. B, June 2011
Software Features and Options (Conventional UT Mode) 197
5.
Using the virtual keyboard, enter the activation code in the field above the virtual
keyboard (see Figure 11-1 on page 196).
6.
When finished entering the activation code, choose
Program Key
to activate the
option and return to the live screen.
11.2 Dynamic DAC/TVG
A distance amplitude correction (DAC) curve is used to plot amplitude variations of
signals from reflectors of the same size, but at different distances from the transducer.
Normally, these reflectors produce echoes of varying amplitude due to material
attenuation and beam spread as the sound beam travels through the part. The
purpose of the DAC curve is to graphically compensate for material attenuation,
nearfield effects, beam spread, and surface roughness.
After plotting a DAC curve, reflectors of the same size as those used for creation of the
curve produce echoes that peak along the curve despite different locations within the
test piece. Similarly, reflectors that are smaller than those used to create the curve fall
below the level, while larger reflectors exceed the curve level.
When a DAC curve is created in the EPOCH 1000 Series, the instrument also creates a
time-varied gain (TVG) setup. TVG is used to compensate for the same factors as
DAC, but the presentation is different. Instead of drawing a curve across the display
that follows the reference-reflector peaks downward as sound is attenuated, the TVG
setup amplifies the gain as a function of time (distance) to bring the reference-
reflectors to the same screen height (80 % FSH).
The EPOCH 1000 Series conventional DAC/TVG feature allows you to toggle between
DAC and TVG views in many of its modes, giving freedom to use both techniques
during a single inspection. When you switch from DAC to TVG view, the DAC curves
are displayed as TVG lines across the screen. The time-varied gain effectively
amplifies the signals across the time base to make the DAC curves appear as straight
lines across the screen.
You can customize DAC/TVG setups to your unique application requirements using
the flexible DAC/TVG software feature for the EPOCH 1000 Series. The DAC/TVG
feature incorporates several DAC/TVG modes that adhere to ASME, ASME III, and
JIS sizing codes. The software offers direct control of gain, range, zero offset, and
delay, as well as scanning gain and transfer correction. In addition, the DAC/TVG
option provides new features such as
20 %-80 % DAC
curves, customizable DAC
curves, and a user-defined TVG table to meet advanced and unique inspection needs.
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