DX-300 – DIVER HELD MAGNETOMETER
User Manual
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8. As you get closer and closer to the target, the DX-300 will begin to have constant
audio output pitch, so you will need to lower the sensitivity to be able to actually
pinpoint the target. Do this by changing the SENSITIVITY setting to HI, MED,
then; as you get even closer, change the setting to LO.
9. If possible, experiment with several different targets of different sizes to get an
idea of how the unit behaves under different circumstances. If you have access to
a buried target such as a Steel Pipe or Armoured Cable then carry out a series of
tests with the sensor held vertical. Having performed the above checks on land,
you are now ready to use the Aquascan DX-300 in the water.
Underwater Operation
NOTE: As explained above in the Land Test, you must be free of objects
containing ferrous materials. Steel dive tanks are generally out of the question.
Most Stainless Steel has little or no magnetic properties, so it usually won’t
interfere with the operation of the DX-300. But check yourself carefully;
something as small as a set of keys can affect the operation of the unit and give you
false readings. Also, don’t try to operate the unit in the vicinity of a large steel
vessel.
1. The control unit of the DX-300 can be worn or carried in a number of ways; the
choice will be influenced by the conditions and diver preference. The most
obvious choice is worn clipped to any suitable location on the diver with the D-
Ring mounting system provided with the unit. Other options include the quick
release belt harness; strapping it to the upper arm, or mounting it to the DX-300
Armsaver optional accessory - supplied with the Professional systems (see
section DX-300 Optional Accessories).
2. The Bonephone should be placed under the hood. If no hood is worn, it can be
placed under the strap of the facemask or under a suitable neoprene headband.
Position the Bonephone so that it is on a bony part of the head close to the ear.
N.B. NEVER PLACE THE PHONE DIRECTLY OVER THE EAR AS THIS
COULD INTERFERE WITH PRESSURE EQUALISATION ON THE
EARDRUM.
3. Dive to the seabed area to be searched.
4. Switch the unit on and rotate the SENSITIVITY control to HI. Hold the Sensor
Probe at full arm’s length in front of you and pointing vertically down. Rotate
the SET AUDIO control to achieve the audio threshold point. Using the Basic Kit
keep the Sensor Probe at arms length and vertical, or in the case of the
Professional Kit utilising the 45° or 90° optional assemblies - according to the
swim height off the bottom.
5.
If you are trying to pinpoint a “response” from a towed magnetometer, the
optional procedures are to operate a circular search using a distance line from a
central marker. Alternatively, using the reference point as the “hub of a wheel”
