Nokta detectors Fors Tech - Manual (Page 19)

One of the following may happen as a result of improper ground balancing:
-The device gives a signal when the coil is swept over the ground where there is no target.
-The device is silent but loses detection depth for certain metals.
-The device receives target-like signals next to holes and dips.
The above mentioned situations do not only occur as a result of improper ground balance
adjustment. However, before looking into other reasons you must be sure that the ground
balance is correctly adjusted.
Ground balance value is common to all modes; changes will take effect in all modes. When
using the automatic ground balance or ground tracking, this setting is adjusted
automatically.
Ground balance can be done in three ways in FORS Tech: Automatic, Manual or Ground
Tracking.
During automatic or manual ground balancing, when you press the ground balance
button, no matter what mode you are using, the device will unnoticeably revert to the
General Search mode and the audible tones will be heard accordingly.
AUTOMATIC GROUND BALANCE:
Automatic ground balance is done the same way in all modes:
1. Find a spot on the ground where there is no metal.
2. Press and hold the ground balance button and pump the search coil up and down from
about 15-20 cm (~6''- 8'') above the ground down to 3 cm (~1'') off the ground.
3. Continue until you hear the beep indicating that the ground balancing is completed.
Based on ground conditions, it usually takes about 1-4 pumps for the ground balance to be
completed.
4. Once the ground balance is done, the ground balance value will appear on the LCD
panel as well as the numeric display on the handle. If you continue to press and hold the
ground balance button, the device will keep on ground balancing and beeping. To make
sure that the ground balance adjustment is correct, please repeat the process 2 or 3 times
and each time check the value on the display. The difference between the values should
not be greater than 1 or 2 numbers.
5. If you cannot ground balance, meaning you don't hear the beep, either the ground is
very conductive or not mineralized or there must be a buried metal object underneath the
coil. In such a case, move to another location and re-ground balance. If you still cannot
succeed, try manual ground balancing.
90
Ground
Balance
Pump The Coil
90
90
FORS / Page 17
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NOKTA DETECTORS
GROUND BALANCE