910-269-EN, Rev. B, June 2011
226 Chapter 11
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
Choose 7/7 > DGS > DeltaVt to adjust the value of the transfer correction.
When adjusting transfer correction, the curve height should remain constant, but
the echo height changes.
11.3.4 DGS/AVG Curve Gain
The overall gain level of the entire DGS/AVG curve can be adjusted higher or lower
from 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
1000 Series using
DGS/AVG curve-adjustment gain.
To adjust the DGS/AVG curve gain
1. Press [GAIN].
2. Use the [UP] and [DOWN] arrow keys or the adjustment knob to adjust the curve
gain. The curve-gain difference is added/subtracted from the instrument base
(reference) gain.
DGS/AVG curve gain adjustment are applied to both the echo height and curve
height to maintain the amplitude ratio and therefore, the sizing comparisons.
Figure 11-22 on page 227 shows a DGS/AVG setup with curve-gain in use to provide
accurate echo-amplitude measurement by placing the echo close to 80 % FSH.
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