Figure 11-32 Adjusting Back Wall Gain - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015
Initially, this base gain level is activated to show the same gain level as the primary
gain control. If the primary gain control consists of a reference gain setting and
scanning dB, the base gain level of the BEA will be the sum of the reference and
scanning gain levels. You can adjust the BEA gain independently to suppress the back
wall echo. Measurements and alarms under gate 2 are based on the attenuated echo.
To adjust back wall gain
1. Press BEA Gain (P6 key).
2. Manually adjust the gain or press 2
echo in the BEA gate to the reference height (XX%) (see Figure 11-32 on page 270).
3. Use gate 2 Start (P2 key), Width (P3 key), and Level (P4 key), to adjust the BEA
gate position.
4. Use Zoom to expand the signal display while adjusting parameters (see
"Zooming on a Gate" on page 132.
When BEA is active, Gate 2 can be positioned anywhere on the visible screen range, to
the extent of overlapping Gate 1.
270 Chapter 11
ND F, (AUTO XX%) to automatically adjust the

Figure 11-32 Adjusting back wall gain