4.1 Thickness Value and Waveform Storage
4.1 Grid Format Storage Mode
1—storage file number
2—line mark
3—row mark
4—data in
stored 5—back to the previous menu 6—save the current thickness
value or waveform 7—delete the selected data
8 - selected current
cell
Whether it is in the interface of thickness value, A-scan or B-scan, the
current measured thickness values will be stored for short press SAVE,
and the current waveform will be stored for long press SAVE. A-scan
waveform will be stored in the A-scan interface, and B-scan image will
be stored in the B-scan interface.
4.2 Browsing the Storage Data
Press
to access the configuration display and select FILE
NUMBER, then press
below OPEN, the file list with thickness
value will appear on the screen. Press
or
to select the
stored file you want to recall, then press
to confirm.
5.Measurement Apply Skills
5.1 Measuring Error Prevention
1. MATERIAL INFLUENCE
In many materials like nonmetal or plastic, the change of velocity is
obvious, thus, the accuracy of measuring is influenced. If the material of
the object is not isotropic, the velocity varies in different directions. In
this condition, the preset velocity should be the average value among
the testing range, which can be acquired through testing a block with
the same velocity as the object average velocity value.
2. ULTRA-THIN MATERIAL
When the thickness of the testing object is below the minimum value of
the probe limit, the result may be incorrect, and the thickness can be
acquired by contracting the blocks when necessary.
When testing ultra-thin materials, sometimes DUAL-ECHO happens,
which is a kind of incorrect result and the result is twice of the real one.
Another
incorrect
result
called
PULSE
ENVELOPE
AND
CIRCULATORY JUMPING, which means that the testing result is higher
than the real one. In order to prevent this kind of error, when testing the
object with the appropriate thickness as the minimum limit and
judgment is available, customer should pay attention to the waveform
displayed and adjust the gain or use blank function.
3.Surface Cleaning Influence
Before measuring, all the dust, dirt and corrosion should be cleaned
and the cover like paint should be removed.
4. Roughness Influence
The extremely rough surface may arouse measuring error or even
reading lost, therefore, the surface of the material should be smooth
before measuring through polishing, filing, grinding or using
high-viscosity couplant.
23
24