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GROUND BALANCE
Ground balance can be performed in three ways with the
IMPACT
: Automatic, Manual and
Tracking (Track).
If the trigger is pushed forward while performing automatic or manual ground balance,
the device will switch to the General Search (GEN) mode automatically on the background
without any indication to the user, regardless of the selected search mode.
Upon completion of ground balance, current ground balance value is shown in the Ground
Balance (GB) box on the right side of the display.
Automatic Ground Balance
Automatic ground balance is performed as follows in all search modes:
1)
Find a spot where there is no metal.
2)
Push the ground balance trigger forward (GROUND BALANCE value and “Pump the Coil”
warning message will be shown on display) and start pumping the search coil up and down
from about 15-20 cm (~6''- 8'') above the ground down to 3 cm (~1'') off the ground with
smooth movements and keeping it parallel to the ground.
3)
Continue until a beep, indicating the completion of ground balance, is heard. Based on
ground conditions, it usually takes about 2-4 pumps for the ground balance to be completed.
4)
Upon completion of the ground balance, ground balance value is shown on the display
(GB). The device continues to ground balance and produce a beep sound as long as you keep
the trigger pushed forward and pump the coil. In order to ensure that the ground balance is
proper, ground balance at least 2-3 times and check the ground balance values on the display.
In general, the difference between the values shall not be higher than 1-2 numbers.
5)
If you cannot ground balance, in other words, if no beep sound is produced, it means that
either the ground is too conductive or not mineralized or there is a target right below the
search coil. In such a case, retry ground balance at a different spot. If you still cannot ground
balance, read the section titled
“Important Details Concerning Ground Balance”
.
When the ground balance trigger is released, the device continues to operate in the GEN
mode for a short period of time and the ground balance value stays on display. This makes
it possible to manually fine tune the automatic ground balance value. Refer to the following
“
Manual Ground Balance
” section for further information regarding this feature. If this is not
desired, pull and release the trigger once to return to the main screen.
