Olympus EPOCH 6LT, User Interface Manual

Page: 188 / 232

DMTA-10084-01EN, Rev. 2, November 2018
Chapter 11 178
The transfer correction can be added during initial setup of the DGS/AVG curve
(
DeltaVt value), but typically this factor is unknown until after the setup is
completed.
To add transfer correction to a completed DGS/AVG curve
1. On the DGS/AVG submenu, press the Tab key to select Delta VT (see Figure 11-21
on page 177).
2. Turn the adjustment knob, and then press the Enter key to set the value of the
transfer correction.
3. Press the ESC key.
When you adjust the transfer correction, the curve height should remain constant, and
the echo height should change.
11.4.4 DGS/AVG Curve Gain
The overall gain level of the entire DGS/AVG curve can be adjusted higher or lower
than the reference gain. 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 DGS/AVG curve
to continue the inspection. This is accomplished on the EPOCH 6LT using the
DGS/AVG curve-adjustment gain.
To adjust the DGS/AVG curve gain
1. Press the Tab key to highlight the reference gain (Ref) adjustment box (see
Figure 11-22 on page 178).
2. Turn the adjustment knob to adjust the curve gain.
The curve-gain difference is added to or subtracted from the instrument base
(reference) gain.
Figure 11-22 (Ref) Gain adjustment box
NOTE