GROUND BALANCE VALUE:
The ground balance value indicates the type of ground. Some typical ground types are as
follows:
0-25 Wet salt water or wet alkali soils
25-50 Wet salt water and wet alkali soils covered with dry layers
50-70 Regular, low-quality soils
70-90 Highly magnetic soils, magnetite or maghemite and similar highly mineralized
soils, black sand
IMPORTANT DETAILS ABOUT GROUND BALANCE:
When the device is turned on, the ground balance value is preset to 90. Automatic ground
balancing value ranges from 40-90 in all modes. If the ground mineralization is too low, the
automatic ground balance may not work. In this case, if the ground effect can be felt in the
General Search mode, manual ground balancing can work. If the ground effect cannot be
felt, you can set it to 60.
You can test the accuracy of the ground balance setting in the pinpointing mode as well.
Once the ground balance is done, lower the search coil to the ground. If the device receives
no signal or a very weak one as the search coil approaches the ground, it means that the
ground balancing was successful. On the contrary, if the device receives noise as the search
coil approaches the ground, it means that the ground balance has failed. In this case,
change your location and try re-ground balancing. If you still cannot ground balance, you
need to continue searching without ground balance. Turn off and on the device again and
start searching without ground balancing. If you receive noise when you sweep the coil
over the ground, set the search mode to FST or BST and increase the ID Masking to a level
where the noise is eliminated. On the other hand, because the ID Masking is not active in
the General Search, if you cannot reduce the noise, you cannot continue searching either.
Once the ground balance is set, it will remain satisfactory for a long time in most areas.
However, in areas where the soil has been disturbed by digging or filling up, or in
geologically complex areas -commonly encountered in gold fields- you may have to
ground balance frequently to accommodate changing ground conditions.
While ground balancing with the optional large coil, pump the coil more slowly.
In certain cases where the iSAT value is high, the device may not be able to ground balance
automatically. In such a case, first decrease the iSAT value and then ground balance.
Afterwards, set the iSAT back to its original setting.
GROUND BALANCE
Page 20
