In All-Metal Mode, both ferrous and non-ferrous targets will give the same
audio response (unless the Multitone function is turned on) by a sudden
increase in the intensity of the threshold tone. A strong response indicates
a large or relatively shallow target and a weak response indicates a small
or deep target. Any audio signal in All-Metal Mode may be analysed by
using the DDM meter. To analyse a signal with the Meter observe its light
response.
In Discrimination Mode, good non-ferrous targets will give a clear, well-
defined, two-way, repeatable audio signal. Ferrous targets will give a
‘clicking’ audio response or an indistinct and erratic response.
Pinpointing is by simply X-ing the coil across the signal. The position
where the signals are strongest below the coil centre indicates the target
position. As with all detectors, when targets are of complex shape or are
located at an angle in the soil, pin-pointing may not be entirely accurate so
it is suggested that, when digging, the user allow space to avoid possible
damage to finds.
Special Modes of operation.
Discriminating Against Ground Minerals in severe mineral conditions.
If normal Ground Balance proves to be ineffective in dealing with the
Ground Minerals then the recommended settings here will help to
overcome the problem. To cancel out the effect of Ground Minerals, turn on
the Iron Rejection Mode using the toggle switch under the control box; this
switch is moved to the LEFT.
Lower and raise the search coil over the ground surface, as you would do
in the standard Ground Balance procedure. Begin turning the Ground
Balance knob anti-clockwise, slowly while swinging the coil until the
ground mineral signals reduce to small clicks. Now the CREDO DDM is
now ready to work in severe Ground Mineral conditions.
Discriminating Against ‘hot rocks’ and metallic ore.
In some instances, the ground balance and/or Discrimination settings may
not be sufficient to remove the audio responses from some types of ‘hot
rocks’ or highly metallic ore pieces.
If this proves to be a nuisance while detecting, the procedure required to
remove the hot rocks and/or metallic ores from the audio signals, or at least
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