1. Initial-blanking: red blanking line indicated on the screen, starting at zero,
so named initial blanking. Waveform with the scope of red strip is invalid, for
omitted the clutter between the starting point and an echo.
2. E-blanking (echo-blanking): blue blanking line indicated on the screen,
only appearance when success measuring. Starting at the first echo
measurement point, so named echo-blanking. Waveform within the scope
of blue stripe is invalid, for omitted the clutter between the first echo and
secondary echo.
NOTE:
This instrument is not require zero calibration in the dual-echo
measurement mode. For zero calibration, please enter the single-echo
measurement mode.
4. Data Storage Function
UM-5DL adopts the storage mode of microgrid format(the follow Figure4.1),
it can save one hundred thousand thickness values and one thousand A/B-scan
waveforms, waveforms and thickness values can be mixed stored in the same
file.The measurement data files can be transferred from the instrument to a PC
via USB communication generate EXCEL or TXT format files.With powerful
Data View PC software, Data statistics, analysis, archiving, printing reports
and other operations.
4.1 Thickness Value and Waveform Storage
Figure 4.1 GRID FORMAT STORAGE MODE
1—storage file name 2—line serial number 3—column serial number
4—data in stored
5—back to the previous menu 6—save the current
thickness value 7—delete the selected data 8— The current cell selected
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 for 3 seconds. A-scan waveform
will be stored in the A-scan interface, and B-scan image will be stored in the
B-scan interface.
4.2Browing The Stored Data
In the parameter configuration interface, select the "File Number" parameter
and press the "Open" key to open the current grid storage file. The thickness
value is intuitively displayed in the grid. A-scan waveform and B-scan
waveform are represented by ASCAN and BSCAN respectively. After
selecting the waveform cell with the highlighted rectangular box, press
to view the stored waveform.
5. Measurement Applying 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.The
average value is obtained by measuring reference blocks whose velocity is
comparable to the average velocity of the block to be tested.
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, when necessary, the minimum limit
thickness can be measured by the test block comparison method.
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