GE USM 36 Series Technical Reference And Operating Manual page 118

5 Operation
N o t e
Make sure that all instrument options for the
specific test are calibrated before starting the
rating according to AWS D1.1.
Remember to peak an echo with an amplitude between
45 % and 55 % screen height. A rating is not possible
with other amplitudes.
– Apply couplant and couple the probe to the reference
standard. Maximize the echo from the 1.5 mm side-
drilled hole.
– Select the function A-START and adjust the gate A
on the reference echo.
– Vary the gain so that the reference echo is indicated
at 50 % screen height.
– Switch to the function group AWS D1.1.
– Select the function B REFERENCE and confirm the
selection to store the reference gain.
5-42
– Couple the probe to the test object to evaluate a flaw
echo.
– Select the function A-START and adjust the gate A
on the flaw echo.
– Vary the gain so that the flaw echo is indicated at
50 % screen height.
– Switch to the function group AWS D1.1.
– Store the current gain by means of the function
A INDICATION. The current gain is stored.
Issue 2 (12/2013)
Rating of welds (function group AWS D1.1)
USM 36