OKM eXp 4500, Руководство пользователя

Страница: 59 / 94

Operating Modes 59
7.4 Tunnel Scan
This operating mode is used to identify tunnels, voids and caverns. To use this mode, it is necessary to
connect the Antenna for Tunnel Detection. If you do not have the optional Antenna for Tunnel Detection,
one must be obtained prior to using this mode. This is an extremely powerful function and can assist you
in identifying tunnels, voids and caverns.
7.4.1 New Tunnel Scan
After activating this operating mode you have the possibility to
adjust the impulse mode setting. In figure 7.17 you can see the
corresponding sub-menu.
Please refer to section 7.1.1 (“New Ground Scan”) on page 52 for
further explanations concerning the impulse mode setting.
Then go to your start position and select the option “Start
Scanning” (Green Tick) to start the measurement. A message will
appear and ask if you are ready to start your measurement.
Rotate the multi-function control knob and select “Yes”. As soon
as you depress the knob, it is important to begin walking
immediately for the eXp 4500 is now recording data.
7.4.2 Browse Tunnel Scans
The option
"Browse Tunnel Scans"
is working accordingly to
section 7.1.2 ("Browse Ground Scans") on page 54.
7.4.3 Delete All Tunnel Scans
The option
"Delete All Tunnel Scans"
is working accordingly to
section 7.1.3 ("Delete All Ground Scans") on page 55.
7.4.4 Scan Technique
When looking for tunnels, voids or caverns below the surface, the
procedure is basically the same as when looking for natural
minerals. The primary difference is that the signal strength will be
much stronger and the typical coloration will be a darker blue.
A tunnel signal in the Visualizer 3D software, is typically represented by a depression from the top of
the scan. The software will show in many cases the curvature or the top of the tunnel, opening or void,
like that in Illustration 7.18. The relative soil will still show the natural mineralization that is in the
ground. Though a tunnel is normally much wider than a buried treasure, the signal strength is much
lower for it is a void. The void is similar to an air pocket under the surface and other signals may mask a
OKM GmbH
www.okmmetaldetectors.com
Illustration 7.16: Tunnel Scan
Illustration 7.17: Automatic or Manual
selection screen