100
EPOCH 4PLUS
Figure 55
Attenuating Material
9.4.8
TVG Table Setup
The TVG Table option can be used to define a TVG curve using a test block and size
reflectors without entering and/or editing specific TVG points. This operation is similar to
the operation described in section 9.3.
The TVG Table feature of Advanced DAC/TVG, including customized TVG point setup,
is activated and defined using the following steps:
1. Select the TVG TABLE feature from the ADV. DAC/TVG option in the Options
Menu by highlighting the feature and pressing [ENTER].
2. Press OPTION to exit the ADV. DAC/TVG menu.
3. At least one reflector MUST be captured using GATE 1. Position GATE 1 using the
slewing keys and capture the reflector using the TVG key [F1]. If setting up a TVG
Table without capturing reference points, proceed directly to Step 5.
4. Use the slewing keys to position GATE 1 around each additional reflector and press
the TVG key [F1] to capture reflectors and bring each to 80% of FSH. A line will
appear to visually indicate the rate of change of the gain across the defined screen
range.
5. Once each point is captured, the operator can use the EDIT PTS key [F5] to enter the
TVG Table mode and edit or delete existing points or add new points. The operator
can also use the DONE key [F2] to complete the TVG setup process and begin
inspection. Note that once the DONE key [F2] has been pressed, the operator cannot
enter the TVG Table mode and edit points. This function must be performed during
the initial TVG setup. The TVG table displays each point (from left to right on the
screen) in sequential order from top to bottom in the table. The point’s corresponding
soundpath time (in µsec), distance measurement (in inches or millimeters, if
applicable), and gain level are displayed across the screen.
6. To scroll through TVG Table points, press [ENTER]. If there are more points than
can fit in the table on screen, press the PAGE key [F4] to see subsequent point ranges.
Up to fifty TVG points may be stored in a setup.
7. To adjust the reference point location of a particular TVG point, use the RIGHT and
LEFT slewing keys to highlight the measurement indication, and use the UP and
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