AKA SIGNUM MFD 7272M GT Manual page 22

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With the bag of soil in hand you can now and press
the GB button and count 1,2,3. Then smooth and slow, (start
ing 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 mov-
ing the soil to the coil instead of vice versa).
To place the device for such balancing on the ground is undesirable. If
you could not find a clean place, then there are a lot of metal objects in
the ground. Metal may be in the coil field of the device and the balance
will go wrong.
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 (after that, manually adjust
the received balance value by -4 degrees to" minus")or a piece of red brick.
These can be placed on the ground and the auto balance procedure per-
formed. 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 15С (compared to a
normal air temp of 20C), we recommend that you perform electronic
module and search coil adaptation procedure one more time (see Search
coil Replacement). In this case the processor of your detector will choose
the optimum frequency of the excitation current for the current temper-
ature conditions. At the same time, all the main indicators of the device,
including the current consumption, will be guaranteed to be saved.
In saltwater beach operations and other complicated soils with high con-
ductivity we recommend you use the " Gain" option or enable the "Econ-
omy" mode for better ground balance accuracy. Sometimes decreasing
sensitivity will allow for a more accurate ground balance especially on
beaches.
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