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material being measured.
5.7
Thickness measurement. Scan Mode
Note - It is sometimes desirable to examine a larger region of test object, in
order to find the thinnest point. The UTG-8 includes a feature, called Scan Mode,
which allows it to do that.
In manual measuring mode, the UTG-8 performs and displays four
measurements every second, which is quite adequate for single-point measurements.
In Scan Mode, however, the gauge performs sixteen measurements every second.
While the transducer is in contact with the material being measured, the UTG-8 is
keeping track of the lowest measurement it finds. When the transducer loses contact
with the surface for more than a second, the UTG-8 will display the smallest thickness
it has found.
For the thickness measurement in Scan Mode, please perform the following
actions:
1)
Plug an appropriate transducer suitable for the selected type of
measurements into the thickness gauge.
2)
Switch the thickness gauge ON by pressing
3)
Carry out zero calibration in accordance with para 6.6 of this Manual.
4)
Set up the ultrasound velocity in a test object or perform the calibration of
the thickness gauge in accordance with para 6.8 or 6.9 of this Manual.
5)
Go to Scan Mode by pressing
appear instead of "M" in the upper part of the display.
6)
Place the transducer onto the test object prior wetted with couplant, and
perform the scanning. While scanning, the display will show the measured thickness
value. In case of a loss of acoustic contact for more than 1 sec., or when finishing the
scanning and removing the transducer from the surface of the test object, the display
will show the minimum thickness, which has been found during scanning.
The minimum measured thickness value will stay on the display, even after the
transducer has been removed from the surface of the test object, until the next
scanning is performed.
button.
key. Observe that the "S" symbol should
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