CONTROL FUNCTIONS
Boost (Shallow/N/Deep)
Figure 4.3
Enhances the signals produced by different types of targets.
• Shallow enables target signals, from small objects close to the
surface of the ground to be amplified. This allows for easier
detection. This setting is best suited for 'quiet' ground.
• N (Normal) may be used for normal detecting conditions. This
setting responds to all signals without boosting.
• Deep may be used when searching for large targets at greater
depth in 'noisy' ground. Random soil signals are smoothed, making
small changes in the audio signal from large deep targets easier to
hear. This may mask some signals from very small targets near the
surface.
Threshold
Figure 4.4
Adjusts the background audio signal or 'threshold' level.
The Threshold control should be set just above the point where the
threshold is just audible and stable.
This level should not be at a level where prolonged use may be
irritating. Ideally it should be a smooth, gentle hum.
NOTE Small targets or large deep targets may not produce a
distinct target signal, but may cause only a small variation in
the threshold level. If the threshold level is set too high or
too low, these very small variations may be missed.
In Figures 4.5 - 4.7, the dotted line represents the level at which the
audio output becomes audible; signals cannot be heard if they are
below the dotted line.
If the threshold level is set too high then small variations in audio signal
might not be discernible above the threshold level (Figure 4.5). An
example of this would be to hear a whisper within a crowded noisy
room.
Figure 4.5 Threshold control too low
Figure 4.6 Threshold control too high
Figure 4.3 Boost switch
Figure 4.4 Threshold control
20
CONTROLS
4
Boost
Deep
Shallow
N
P0519-A
Audio
P0520-A
Threshold
P0509-A
Louder
Audible Signal
Small
Target
No Sound
Too High
Large
Target
P0532-A
Louder
Audible Signal
Small
Target
No Sound
Large
Target
Too L ow
To Next Page
Loading...
