YUSHI INSTRUMENTS
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6.2.2 Measurement of the flaw length
Press , set the flaw highest wave to 80% of the full scale, then move parallel the probe to
the left, and observe the echo on the screen. When the echo drops to 40%, (namely half of the highest
wave). Measure the distance from the probe to the left side of the steel plate and note down as S1. Then
move parallel the probe to the right, back to the position of the highest wave, and keep moving the probe
rightwards parallel till the echo drops to 40%. Then measure the distance from the probe to the left side
of the steel plate, and note down as S2. Then subtract S2 from S1, the result value is the flaw length (L).
Fill the data measured above into the corresponding column in the table. According to the
above-mentioned way to find the flaws and measure them.
Chapter 7 Maintenance and Repairing
7.1 Operators’ Training
In order to operate the instrument correctly and safely, all operators have to accept formal skill
trainings on ultrasonic defectometer operation and study the Operator’s Manual carefully beforehand.
Lacking special knowledge in ultrasonic flaws detecting may cause unpredictable erroneous results. To
operate the instrument safely and correctly, please contact nondestructive testing organizations to require
related information on training operators and on how to acquire certifications through related grade
examinations.
7.2 instrument maintenance
Please use the standard connecting cables and communication cables and other accessories attached
with the probes. Unmatched cables may result in electric circuit breakdown inside the instrument or
cause damage to the sockets. Any liquid should be absolutely prevented from flowing into the
instrument.
In the process of transporting or moving, don’t drop and hit the instrument. Strong vibration, getting
wet in snow and rain should be avoided.
The outside of the instrument should be cleaned each time after operation. Then put it at a dry and
