phase II+ UTG-400, Manual, Page: 15 / 22

3.8 DUAL ‐ ECHO (THRU ‐ COATING) MODE
The UTG‐4000 can accurately measure the actual material below the coating utilizing the dual echo
measurement principle. This feature allows you to measure the material without having to destroy or
remove the protective coating of a surface.
Press “M” to go into the parameter interface and set Measurement mode to DUAL‐ECHO and press “M”
to return to the main measurement screen.
3.8.1 A ‐ Scan interface in dual ‐ echo mode
The UTG‐4000 allows you to use A‐scan while in the dual‐echo mode. This feature has added E‐blanking
option as well as the option to cancel GATE. When measuring, the blue strip area indicates the length of
echo blanking./ the waveform above this is considered invalid.
See fig 3.16 below:
1) Identification of dual‐echo mode
2) Blue arrow indicates secondary echo
3) E‐blanking
4) Blue line: the length of echo‐blanking
5) Red line: length of initial blanking
6) Red arrow: indicates first echo
Blanking in Dual ‐ Echo Mode:
a) Initial blanking: The red blanking line starts at zero. The waveform within the scope of the red
strip is considered invalid due to lack of clutter between the starting point and the first echo.
b) E ‐ Blanking(echo blanking): the blue line indicated on the screen appears when a measurement
has been successfully taken. This line starts at the first echo measurement point. A waveform
within the scope of the blue stripe is also considered invalid due to lack of clutter between the
first echo and secondary echo.