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EPOCH 4PLUS
9.4.2 Option Activation and Reference Correct
Prior to the activation of options associated with Advanced DAC/TVG, the instrument
must be properly calibrated to the material being inspected. The ADT option is located
under the Options Menu. To begin the activation process, highlight ADV. DAC/TVG
from the Options Menu and press [ENTER]. Use the UP and DOWN arrow keys to
highlight the desired DAC/TVG option and press [ENTER] to select the option from the
list.
Figure 46 Option Activation
In all modes, the live signal amplitude as compared to the level of the activated DAC curve
is displayed at the top right of the screen. The operator may choose to display this
comparison in terms of either a percentage or decibel measurement. After selecting a
DAC/TVG option from the Options Menu, the user must select either % AMP or DB by
highlighting the desired choice and pressing [ENTER].
The user may also choose to apply a feature known as reference correction to the
amplitude analysis of the live A-Scan and DAC/TVG option. The reference correction
feature, when activated, allows full gain manipulation of either the live echo peaks or the
DAC curve while providing the % amplitude or dB comparison of the actual peak-to-
curve ratio. This allows the operator to use scanning gain, while maintaining an accurate
digital measurement of the ratio of the gated peak to the DAC curve for sizing purposes.
The gated echo amplitude is corrected back to the Reference Gain level for amplitude
evaluation compared to the DAC curve.
The reference correction feature is activated by highlighting REF CORRECT in the ADT
Options Menu and pressing [ENTER] to check the REF CORRECT box.
Once all desired settings are activated in the Options Menu, press the OPTION key again
to exit the menu and begin using the selected software option.
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