Velleman CS4MX-I - Manual (Page 8)

8
On the majority of inland sites the ground control should be set to AUTO
and the recommended sensitivity setting between 7-9 on the scale will give
the best results. Some types of ground may give rise to false signals and the
sensitivity level should be reduced to a point where operation of the detector
becomes stable.
Sweep the detector head from side to side with a steady relaxed motion.
Keep the search-head parallel and as close as possible to the ground right
across the arc of the sweep.
Search your chosen site carefully by moving forward only the width of the
search-head at each sweep. Move up and down the search area in lines so
that there is plenty of overlap in the ground you have covered. Search with the
sensitivity set as high as possible according to the ground conditions.
If the ground condition is suitable (constant with low contamination and
mineralisation) it is possible to precisely set the ground cancellation
and then increase the sensitivity beyond the medium position in AUTO ground.
Some detector users prefer to set the sensitivity control at a point where there
is no background tone, sometimes called ‘silent search’ (Sensitivity control
set around 8 on the scale). With the detector set like this it is more noticeable
when a target signal occurs. If the detector is set at maximum sensitivity
(Sensitivity control set at 10 on the scale) there will be a constant audio tone
in the background.
Setting the GROUND control.
Experienced users can achieve higher sensitivity settings on ground with a
constant effect. This ground is usually low in contamination and mineralisation.
First set DISC 1 in All Metal mode and Ground in AUTO then check for an area
free from metal to set the ground position.
While you are continually raising and lowering the search-head near the ground
(approximately 10cm) rotate the ground control clockwise until you just get to
the point where the detector does not emit a sound as you raise and lower
it. Increase the sensitivity slightly and recheck the ground setting. Repeat this
until false signals are obtained and then reduce the sensitivity very slightly. The
detector will now be optimised for that particular site. Set the required position
on DISC 1 and carry on searching. If you are unable to get stable signals return
the detector to AUTO ground and reduce the sensitivity as necessary.
Detecting with the CS4MX