Olympus EPOCH 6LT, User Interface Manual

Page: 177 / 232

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.