Adjusting these three settings correctly is critical for the device to work at its best
performance and without noise. It is possible to obtain an average performance with the
startup settings. However, to be able to have better detection depth in clean areas or to be
able to search in tough ground conditions, these three settings must be adjusted properly.
Sensitivity, iSAT and Threshold in General Search Mode:
In the General Search mode, a constant background hum is heard during searching. The
loudness of this hum directly impacts the detection depth of smaller and deeper targets
and it is adjusted by the threshold setting. If the threshold is set too high, the target signal
may not be heard. On the contrary, if it is too low, you give up the depth advantage this
setting offers. In other words, weak signals of smaller or deeper targets may be missed.
Threshold setting comes with the default value at each startup (not with the last adjusted
value). It is recommended for average users to leave this setting at its default value and for
experienced users to adjust to the highest level where they can still hear the weak target
signals.
You cannot search in the General Search mode without ground balancing. Changes that
occur in the ground effect after ground balancing cause false signals or disruption in the
threshold hum . iSAT adjusts the speed that the device recovers its threshold hum and
eliminates the negative effects of mineralized soils.
Increasing the iSAT in high mineralization will enable a more stable operation by avoiding
false signals. This, however, may cause some loss in depth and it is normal.
NOTE: In high mineralization, if you receive too many false signals without disruption in the
threshold hum, lower the sensitivity first before increasing the iSAT. If the false signals
continue, set the sensitivity back to its original value and increase the iSAT.
If the mineralization is low, you can decrease the iSAT and sweep the coil more slowly for a
deeper search.
In the General Search mode, although the sensitivity setting seems like it is behaving
similarly to the threshold, it actually causes an increase or decrease in the popping sounds
and false signals. It is important to set the sensitivity setting to the highest level possible
where no major popping sounds are heard. For example; if the noise level is suitable for
searching and is the same at sensitivity levels 20 and 50, then 50 should be preferred. Using
the factory default levels will be a good starting point until you get familiar and
experienced with the device.
If the device is stable but too noisy, the threshold setting should be decreased. However, if
it sounds erratic and there is too much popping and disruption in the threshold hum, first
the sensitivity setting should be lowered. If the noise continues, the sensitivity should be
set back to its original setting and iSAT should be adjusted.
Sensitivity in Discrimination Modes:
Because there is no threshold in discrimination modes, by using the sensitivity setting
alone, you can increase the detection depth or enable the device to run without noise in
different fields.
SENSITIVITY, iSAT and THRESHOLD
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