White’s Electronics Sierra Madre - Manual (Page 9)

9
1. TUNER: The TUNER control turns the in-
strument ON/OFF, tests the battery strength
(BAT.√), and selects the steady hum or threshold
which should be heard continually during use.
The TUNER should be set to a slight steady hum
(threshold) each time the instrument is to be op-
erated. Changes in temperature will change the
particular area of the control needed to achieve a
threshold hum.
A. OFF position is selected when the detector is
not in use. (Batteries should be removed when
the detector is stored.)
B. BAT. CHK. Battery Check is used to check
the condition of the batteries. When placed in this
position, the current battery condition is shown
on the meter. An indication anywhere in the
BATTERY GOOD area will operate the detec-
tor. Once the battery no longer indicates in the
BATTERY GOOD area, new batteries should be
installed. Usually batteries last between eight and
16 hours of use. (Battery life varies with type,
temperature, and mode). The use of headphones
will significantly improve battery life.
C. To set the TUNER hold the loop at waist
level away from metal and the ground, turn the
TUNER control until a very slight faint hum
(threshold) is heard. The TUNER control should
end up near .
D.
Silent Search once the threshold has been
set, the TUNER can be turned very slightly to-
ward (-) to produce silent searching until a tar-
get is detected. Doing so, some detection depth
may be lost.
2. MODE: The MODE control selects either
HIGH (MINERAL) or LOW (MINERAL)
ground. Special attention must be used when
changing MODEs. Each time the MODE is
changed the TRIGGER on the handle should be
squeezed and released.
Explanation of Controls
Explanation of Controls
A. HIGH MINERAL, is the primary MODE
used for general searching. It minimizes com-
mon high mineral ground effects (large ground
signal). High ground mineralization typically
will cause more receive signal than the electron-
ic circuitry can handle. Such conditions result in
overload of the receiver, which will cause poor
detection depth. The HIGH setting compensates
for such ground conditions.
B. LOW MINERAL is used in those rare
areas that have little or no mineralization. It
maximizes performance in such low mineral
ground(minimal ground signal). Low ground
mineralization typically has little or no effect
on the receive signal, the LOW setting com-
pensates for this lack of ground signal thus
improving performance in such ground types.
CAUTION: If the LOW setting is used in high
ground mineralization the detector will become
unstable and unpredictable. Switching back to
the HIGH setting, squeezing and releasing the
TRIGGER on the handle, and repeating the
AUTO GEB sequence will regain the stability
necessary for good detection results.
3. AUTO GEB: The AUTO GEB switch is used
to select the actual ground selection setting, so
that ground minerals can be ignored. When
ground minerals are ignored, increased detec-
tion depth and smoother operating stability are
achieved. The AUTO GEB also selects whether
the ground rejection setting stays as originally
set ( LOCK), or whether the instrument au-
tomatically updates this original setting to ac-
commodate naturally occurring changes in the
soils mineralization, (AUTO TRAC). Setting the
AUTO GEB is recommended each time you use
your instrument.
A. To set the AUTO GEB place MODE to
HIGH, squeeze and release TRIGGER on han-
dle. Hold the loop at waist level away from all
types of metals and ground minerals and adjust
the TUNER for a slight background hum. Press