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5. Making Conventional Measurements
C ATTENUATION—Determined by subtracting 1 inch
from the sound-path distance to the discontinuity, using
the equation (inch units): C = (SA–1) × 2. This compen-
sates for sound loss from material attenuation along the
sound path to the discontinuity.
D D1.1 RATING—Calculated based on the AWS for-
mula: D = A-B-C (See NOTE)
NOTE: The dB value of A-Indication will be automati-
cally adjusted to match the amplitude of the B-Ref upon
performing the dB rating calculation.
Before activating the AWS D1.1/D1.5 weld rating feature,
be sure that all instrument settings are properly adjusted
for the specific measurement application. Then access
the AWS D1.1 Menu (via the HOME Menu) and follow
this procedure:
Step 1: Apply couplant and couple the probe to a suitable
reference test standard.
Step 2: Ensure that the A-Gate is positioned over the
desired echo. Then adjust the gain until the peak of the
desired reference echo reaches the desired amplitude
as shown in
Figure 5-12.
amplitude (A%A) does not fall between 10% and 90%,
the inputted point will not be accepted.
FIGURE 5-12—After adjusting the gain so that the reference echo's peak is between 20% and 90% of full screen height,
record the reference dB. This reference value will be stored in the instrument until manually changed.
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Note that if the echo's peak
Step 3: Press
next to the B REFERENCE function
(then
to confirm) to define the reference dB level.
Step 4: To evaluate a reflector in a test piece, couple the
probe to the test piece. Now adjust the A-Gate position,
if required, so that it is over the desired echo as shown
in
Figure 5-12.
Step 5: Adjust the gain until the peak of the test-piece's
echo reaches the desired screen height as shown in
Figure 5-12.
NOTE: The dB value that is recorded for A-Indication
will be automatically adjusted based upon the ampli-
tude difference between it and the value recorded for
B-REF. It will usually NOT match the instrument's dB
gain setting.
Step 6: With the AWS D1.1 SETUP Submenu displayed,
note that the A, C, and D parameters automatically update
to match the A-Gate triggering echo. Press
next to A INDICATION to HOLD the current parameters
until pressed again. Note that the displayed RESULTS
continue to update while the A, C, and D parameters are
held (press
to freeze the display and results).
(two times)
PHASOR XS Operating Manual
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