2. Switch on and work with Delta4.
1. Turn the ―ON / VOLUME‖ knob to ―ON‖ and adjust pref erenc e volume of
sound.
2. Setting the ―THRESHOLD‖ - While holding the detector a few feet above
ground and away from any metal object, slowly turn the ―THRESHOLD” knob
until you hear a very slight audio tone through the speaker or headphones. This
is the optimum set-point for the ―THRESHOLD”. A light ―buzz‖ adjustment is
recommended to insure optimum depth and maximum performance.
As ―THRESHOLD‖ is in l ow position, as low is sensitivity. Too low of a
threshold setting may cause very weak signals to not be heard. Too high of a
threshold setting may cause operating instability.
3. You can work in manual or in automatic ―GROUND REJECT‖ mode:
- In manual ground reject mode:
Switch in ― MANUAL‖ position.
Search for and select a clear piece of ground or sand that does not contain any
metallic targets. With the coil elevated at least waist high and away from any
metallic target, slowly adjust the THRESHOLD control until a very faint audio
threshold signal is heard.
Lower the search coil to within one-inch of the ground surface while listening
to the threshold audio signal. If the threshold signal is high tone, the
―GROUND REJECT‖ control needs to be decreased (rotate counter clockwise).
If the threshold signal is low tone, the ―GROUND REJECT‖ control needs to
be increased (rotate clockwise). Keep repeating this step until threshold signal
is the same within one-inch of the ground as it is in the air. Once this is
accomplished, the detector is properly ground balanced.
When the ground mineralization is rejected, the detector can see deeper targets,
and is less susceptible to ground interference.
While balancing the detector, you have to be sure there are no metal objects
around the search coil. If it seems difficult or impossible to get little change in
the steady threshold as the coil is lowered, you may be attempting to tone on
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