910-269-EN, Rev. B, June 2011
Software Features and Options (Conventional UT Mode) 233
To display a D indication rating value, the gated echo must peak at an amplitude
less than 110 % FSH. Often, you simply have to turn off the scanning gain to bring
the echo peak onto the screen. In some cases, further gain adjustments may be
necessary.
11.4.4 Calculating A and C Values
When a gated echo whose peak is below 100 % FSH is present, the EPOCH 1000 Series
automatically calculates the A and C values necessary to provide a D indication rating
value. For A, the EPOCH
1000 Series automatically calculates the required dB value to
bring the gated echo to 80
% FSH. To calculate C, the EPOCH 1000 Series uses the data
in the sound path calculator to generate an attenuation factor.
In order for this calculation to be accurate, you must enter the correct thickness
for the test piece.
By pressing [SAVE], you can now save the data for this discontinuity in the
EPOCH
1000 Series data logger. For general data logger information, see chapter 10
on page 175.
At the bottom of an ID saved with AWS D1.1 active, you can see the values for A, B, C,
and D. This data is viewable in the file review window.
While using the EPOCH 1000 Series and the AWS D1.1 software feature, it is your
responsibility to take into account any inspection conditions that could cause
variations in the displayed indication rating (D value), as well as interpret the
meaning of echo indications and reported D values corresponding to these
indications properly.
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