Velleman CS6MX-I - Manual (Page 8)

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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.
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.
1. Set DISC to All Metal mode and Ground to AUTO then check for an area
that is free from metal.
2. Turn the IRON VOL to 10, and set the GROUND control to 5. Rapidly raise
and lower the search head. If the audio is high pitched, decrease the GROUND
setting. If the audio is low pitched, increase the GROUND setting. Repeat this
process until the setting is reached where the detector is silent. Then set the
IRON VOL. to your normal preferred setting.
Detecting with the CS6MX