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to reduce their interference, is similar to that used for Discriminating
Ground Minerals.
To remove the hot rocks and/or metallic ores from the audio signals turn on
the Iron Rejection Mode using the toggle switch under the control box; this
switch is move to the LEFT.
Start swinging the search coil over a sample of the specific type of a hot
rock or ore piece that you wish to be removed from the audio responses,
positioned as you would detect them during normal searching. Begin
turning the
Ground Balance
knob from approximately middle position in
anti-clockwise direction, slowly and while swinging over the target until the
audio signal reduces to clicks. The CREDO DDM
is now able to work
effectively in fields loaded with hot rocks or metallic ore pieces.
Discriminating Against Salt Water on wet sand or tidal beaches.
The procedure is very similar to that used for ‘hot rocks’ and minerals; After
initial set-up, begin turning the Discrimination knob from position 0 to
clockwise direction, very slowly until the salt water signals turn into small
clicks. Keep the Ground Balance know in position where the ground
minerals are usually cancelled (balanced out). The CREDO DDM is now
ready to work on the beach.
Discriminating Against Large Metal Objects (leaving only the smaller
ones) and Special Gold Nugget hunting setting.
There are some conditions where only small targets are required in a
particular search; desirable targets such as gold nuggets or tiny coins.
These are especially difficult to search for in contaminated conditions or in
the presence of mineralised soils.
To remove all large targets and leave only the desired very small objects,
make sure that the Discrimination level is set to allow your desired small
targets to be in the range of good (non-ferrous) targets. Turn on the Iron
Rejection Mode using the toggle switch under the control box; this switch is
moved to the LEFT
Begin swinging the coil over any target that you wish to remove from the
audio responses. While swinging the coil, start turning the Ground Balance
knob anti-clockwise position as slowly as possible. Keep doing so until all
large targets and minerals are removed and only the gold nuggets and
smallest non-ferrous objects are left for detection.
The CREDO DDM
is now ready for hunting only those small targets.
Summary of Contents for Metal Detector
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