OKM eXp 4500, Руководство пользователя

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60 Operating Modes
tunnel signal. In the event that a tunnel signal is realized, conducting the control scans is necessary for
a proper analysis.
In the illustration above, the scan was conducted using a normal traditional ground scan with multiple
scan lines. When conducting a traditional ground scan, the parallel method of scanning must be used.
With the three views, one can clearly see where the tunnel is.
The illustration 7.19 to the right is another example of how a
tunnel may appear. Though the overall signal values are not
very strong, the repeatability of the object has made it so
that the form of the tunnel is easily recognized.
To best find a tunnel there are two possible scanning
methods that can be used. The first scanning method is the
Parallel method which is explained earlier in this manual.
When using this method, the “Ground Scan” function will be
used.
The second method is the Single line method. Selecting the
“Tunnel Scan” will create the precedence to conduct only a
single line. The scan line starts at the beginning and at the
end of the line the scan can be saved into the internal
memory. A multiple line scan is not possible.
It is important to set your starting point and be sure that you
are walking a straight line. While walking the line it is also
very important that the height of the antenna does not change. Since the Antenna for Tunnel Detection
is shorter than the Super Sensor, it is important that the antenna be held in the vertical position. Do not
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Illustration 7.18: Tunnel shown in multi-line scan
Illustration 7.19: Customer submitted tunnel
found in Turkey