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Селективный металлодетектор «Сигнум MFT» 7272М. Руководство по эксплуатации.
degrees. If you encounter this problem then perform the ground balance procedure
as follows
.
Find a clean patch of ground with a width of 60 centimeters. Switch to manual ground
balance and making short horizontal search sweeps with a width of 50cm at a height 3-5cm
above the ground, you will see a straight line on the ground the screen (if the line jumps,
then there is metal present). In this case, if the balance is wrong, you will hear a buzz from
the soil and the soil line on the on the screen will not be horizontal.
Press and until the line is horizontal and the buzz disappears.
Your device is fine-tuned to the ground.
For a small increase in the depth of the identification of large silver and copper
coins (kettles, basins and other large pieces of highly conductive metals) it is possible, after
performing automatic ground balancing, to enter the manual balance mode and set the GB
point from -1 to -2 from the automatic GB reference point.
Care should be taken when setting the ground balance point either negative or
positive. When set negative it increases the possibility of receiving false positive responses
when bumping the coil on vegetation or the ground. When set positive you risk the chance of
losing sensitivity to large silver or copper coins that will either become “invisible” or ID as
iron.
In the event that a “clean” patch of ground is not found you can excavate a small
amount of local soil (1-1.5 kg), removing all metal objects, and place in a bag for
convenience. Now lean the detector with the coil facing up against a bush or tree with the
coil at least 40-50cm off the ground. With the bag of soil in hand you can now and press
the GB button and count 1,2,3. Then smooth and slow, (starting from a distance of
30-40 cm) present the soil to coil. (As if doing auto balance on the ground in the normal
mode, but now you are moving the soil to the coil instead of vice versa)
Placing the excavated soil on the ground is not desirable. Since you were not able
to perform a ground balance previously, due to the presence of metal in ground, placing the
bag of soil on the ground may cause an incorrect ground balance.
Attention! If the signal from the ground is too small (such as quartz sand) and the
auto balance cannot be performed then the balancing procedure can be
performed either by using a piece of ferrite or a piece of red brick. These can be
placed on the ground and the auto balance procedure performed. In principle,
using the procedure for balancing for “an air test” will also work and you may set
the balance point 1 or 2 degrees negative if you are searching for large objects.
Sharp temperature changes on the search coil may impact balancing accuracy,
the balance may shift and become incorrect with such changes. That is why, if you take the
device from a heated car and start working in a low temperature conditions (early spring, late
fall), rebalance one or two times while the coil adapts to the ambient temperature.
In case of large temperature drops of more, than 15°С (compared to a normal air
temp of 20C), we recommend that you perform electronic module and search coil
