Minelab SD2200v2 Instruction Manual page 9

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5.2.4 Set the Tone Control
Carefully adjust the Tone control until the threshold sound is at a comfortable
pitch for your hearing. Note that interpretation of the detection signals involves
understanding the difference between the rising and falling pitch of the
threshold. Again, we suggest you take time to experiment with known
targets. Generally, setting the Tone control at a high pitch is more fatiguing
but better for identifying the faintest signals.
5.2.5 Set Tune Control
With the SD2200v2 operating and the Threshold control and Tone control
set:
· Hold the detector at waist height and the coil vertical.
· Keeping the coil vertical, slowly move it through a half-circle around
your body. Listen for an increase in interference as you move the coil.
When the interference is loudest, stop moving the detector, hold it
motionless in that position and momentarily press the Tune button.
· The detector will now scan through its range of transmission
frequencies and automatically select the frequency that offers a
minimum of interference. The end of the search (which takes about
one minute) is announced by three beeps.
Important: While the detector is selecting the preferred frequency, the coil
must be kept motionless and clear of metal objects.
· In some cases it may not be possible to remove the interference
completely, but the effect will be greatly reduced.
· Once this control has been set for the location you are in, it should not
require readjustment unless conditions change or new interference is
introduced such as other detectors operating in the vicinity.
5.2.6 Boost Switch (Shallow, N, Deep)
This switch is used to select the type of sound made by the detector in
response to different target types. In the Shallow position, signals from
small targets close to the surface are boosted. This makes it easier to
hear these target signals. This setting will also tend to boost ground noise,
so this setting is best used in quiet ground.
The Minelab SD2200v2 Instruction Manual
The Deep position is recommended when looking for big targets at depth.
It smoothes out background sound and signals from small targets, making
small changes in audio signal easier to hear.
For normal detecting conditions use the N (normal) position, which does
not boost any signals.
Select whichever position best suits the conditions of the area you are
detecting. Each time the switch is changed, the threshold will also need to
be changed.
External amplifiers may be used in addition to the boost switch, provided
they have loudness limiters built in. This prevents loud signals becoming
unpleasant or dangerous to hearing.
5.2.7 Channel Switch (Ch1, Both, Ch2)
In almost all circumstances, this switch should be set to Both. There are
very few circumstances in which it is beneficial to use either of the other
settings and to do so will reduce sensitivity to certain types of targets.
The function of this switch is to select which of the channels the detector
uses to generate signals. Each of the channels has a sensitivity to its own
range of target types and sizes and each channel complements the other.
When set to Both, the detector uses the best channel for a particular target
to generate the signal. It is for this reason that Minelab recommends the
use of Both in almost all circumstances.
Selecting Ch1 can help reduce ground noise from very noisy ground. It
can sometimes stabilise the threshold which will assist in hearing faint
targets in such conditions. As a result of excessive ground noise, Minelab
does not recommend the use of Ch2 by itself.
Setting the Channel switch to Ch1 does not affect the blanking of sounds
due to ferrous targets while in Disc or Disc + ID. Note that in general,
however, the signal pitch and volume in Disc + ID mode for a target will be
altered.
Note that the Channel switch does not affect the way in which the automatic
ground balance operates.
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