Olympus EPOCH 6LT - Figure 11-13 DAC with 6 Db Scan Gain - Reference Correction Active

DMTA-10084-01EN, Rev. 2, November 2018
Software Features and Options 167
Figure 11-13 DAC with 6 dB scan gain — Reference correction active
11.3.5.2 Curve-Adjustment Gain (DAC Gain or TCG Gain)
The overall gain level of the entire DAC curve and TCG line setup can be adjusted
higher or lower from the reference gain (Ref). Most inspection codes do not permit
reflectors to be sized below 20 % FSH. Therefore, to inspect beyond a certain
depth/sound path time within a part, it is necessary to raise the gain of both the live
A-scan and the DAC curve to continue the inspection. This is accomplished on the
EPOCH 6LT using the curve gain (DAC curve-adjustment gain).
To adjust the curve gain
1. In the DAC/TCG submenu, press the Tab key to select Gain Step.
2. Turn the adjustment knob to select the desired increment of the gain adjustment.
3. Press the Tab key to highlight DAC Gain, and then turn the adjustment knob to
adjust the curve gain.
Figure 11-14 on page 168 shows a DAC setup with DAC gain in use to provide
accurate echo amplitude measurement by placing the echo close to 80 % FSH.