White’s Electronics MXT 300 - Manual (Page 16)

16
Chapter 5 MXT 300 Controls
TRAC TOGGLE
TRAC Toggle
The TRAC toggle selects the type of ground
mineral rejection (ground balance) and automatic
tracking to ground mineral changes best suited to
the specifi c area. Three different positions each for
a specifi c ground condition (ground type) are pro-
vided.
The Ground position is used for normal or typical
ground conditions. In this position the MXT 300
will quickly compensate for ground minerals in a
few pumps of the search coil over the ground being
searched and quickly (automatically) track to any
ground changes as you sweep the search coil during
searching. For most operators the Ground position
will be used for over 90% of your searching condi-
tions.
The Lock position monitors, however, doesn't track
to changing ground conditions. Man made iron
decomposes to the point of tricking the Ground and
Salt position tracking into thinking it is a mineral-
ized part of the ground. This can create noise and
instability during searching as the tracking system
bounces radically up and down the scale, always
searching for a good ground rejection setting and
is never able to fi nd it. This makes it diffi cult for
an operator to recognize worthwhile targets and/or
run at the higher performance GAIN settings. In
these conditions it is recommended to fi rst go to the
Ground position and pump the search coil over a
clean area of ground representative of the area (free
of man made iron) then switch the TRAC control to
Lock. By doing so stability and success searching
these trashy areas will improve dramatically. Be-
cause ground changes are monitored during Lock,
once an operator switches back to either Ground or
Salt tracking positions, updates to an appropriate
ground setting are virtually instantaneous.