910-269-EN, Rev. B, June 2011
208 Chapter 11
When reference correction is active, the digital comparison between a captured
reflector and the DAC curve is accurate even with the scanning gain applied to
the inspection provided that the gated echo is not saturated. Figure 11-11 on
page 208 shows the same setup as above but with
Reference Correction
active.
Notice that the scanning gain has been removed from the dB-to-curve
measurement in location 5. The instrument compares the echo height to the DAC
curve, compensates for the added scanning gain, and reports the true-amplitude
comparison.
Figure 11-11 ASME DAC with 3 dB scanning gain and reference correction active
11.2.4.2
Curve Adjustment Gain (DAC Gain or TVG Gain)
The overall gain level of the entire DAC curve and TVG line setup 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
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