Instrument
A3-28 ENVI-MAG Manual
AUTO
TUNE
A “yes/no” toggle that controls the auto-
matic tuning function.
It is independent for the Total-field sensor
and the Gradiometer sensor.
The tuning value is updated after each
reading in preparation for the next one.
Auto tuning is particularly applicable if
large variations of the ambient field are
encountered over longer distances.
Fixed tuning may be more appropriate in
areas of large cultural electrical noise or
very narrow, large amplitude anomalies.
These may pull the tuning away from the
desired frequency to that of the interfer-
ing frequency or to tuning field values
greatly different from the background.
As the setting of this parameter depends
upon your particular survey conditions, it is
not possible to suggest the best setting.
The mode should therefore be established
by experimenting. In general it is more ap-
plicable to use fixed tuning for the
site
characterization
and
drum location
modes.
No
BASEFIELD
The base field is used in conjunction with
the
base-station correction
procedure.
The base-station correction technique
removes variation in the ambient field
during the time that the base station is
running. However, variations taking place
from day to day are not corrected. The
base field value is used for this purpose.
The actual value is not critical, as long as
it is the same for all instruments in the
survey. It is important that this value not
be changed during the entire survey. A
logical value is the first reading of the
base-station on the first survey day.
0
Parameter Description Default
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