DX-300 – DIVER HELD MAGNETOMETER
User Manual
4
switches to desensitise as necessary to note the point where the peak response occurs.
The diver next determines if a larger peak response can be on a line that intersects at
90 degrees to the original search direction, this will assist in determine the exact
centre of the target and to an extent the size and shape of the target. The above
described technique using steady straight line searching and use of the range switches
to reduce the sensitivity where necessary to determine the true centre of the response
will pay dividends in terms of diver bottom time and in focussing any following
excavation in the most likely productive area.
General comments
The DX-300 is NOT a metal detector. It detects localised disturbances in the earth’s
magnetic field that are caused by the presence of ferrous material. The user should
note that other things can cause magnetic disturbances that will affect the DX-300
operation. These include electromagnetic fields produced by electrical and electronic
devices. Working around large industrial areas or under transformers and high
tension power lines will generally give the user problems with false readings. In the
water it is just important to be clear of any influence that may be generated by a large
steel vessel; and of course equipment on the diver such as a steel dive cylinder.
If you are searching for small items of debris, such as a cannonball, a pistol, a hand
tool; you will probably be more successful utilising a metal detector such as the
Aquascan AQ1B. The DX-300 is more suited towards larger items, which will cause
a larger magnetic deviation. The DX-300 is ideal for commercially searching for
buried UXO, pipes, cable and large ferrous debris. For archaeologists and wreck
hunters it is ideal for locating cannons, anchors, chains and other large ferrous items
that can confirm the presence of a buried wreck site. Large ferrous masses will be
detected at greater distances than smaller masses and will be noted to have a much
slower build up to the peak audible response.
The DX-300 Equipment
The AQUASCAN DX- 300 Basic Kit consists of the following items:
1.
Sealed electronic unit
2.
Bone conductor earphone (Bonephone) .
3.
Sensor Probe with cable and plug.
4.
Mains Battery charger (100-250v) with AC charging lead.
5.
D-Ring mounting system.
6.
Operating instructions.
