White’s Electronics Sierra Madre - Manual (Page 7)

7
Tuning and General Use
Fine Tuning:
Fine tuning the SIERRA MADRE immediately
improves performance. The keys to fine tuning are
the AUTO GEB switch and the MODE control.
The AUTO GEB (automatic ground exclusion
balance) switch sets the ground rejection. When
the ground is rejected the detector can see deeper
targets, and less susceptible to ground interference.
The MODE control is used to regulate the amount
of ground signal the detectorʼs electronic circuitry
can handle. The HIGH setting allows for typical
high mineral ground. There are some rare areas of
low ground minerals. These areas are best searched
with the MODE control set to LOW. If you are
unfamiliar with ground mineralization always
start with the HIGH setting, reserving the LOW
setting for a time when you have more experience.
Each time the MODE control is changed to a
different position it is best to squeeze and release
the TRIGGER on the handle with the loop at waist
level.
When a new area is to be searched, the following
steps should be followed to maximize performance.
When changing to another area, or when dramatic
changes in the ground are visible, these steps
should be repeated.
Fine Tuning Steps:
1. Set the TUNER to , and look at the meter
to assure the batteries test good. Hold the loop at
waist level and adjust the TUNER for a slight hum.
2. Set MODE to HIGH, squeeze and release the
TRIGGER on the handle.
3. Push the AUTO GEB switch to the AIR
position and hold it there until the detector beeps.
Immediately lower the loop to the ground and pull
the AUTO GEB switch to the GND AUTO TRAC
position (ground auto tracking). Hold the loop
steady until the detector again beeps.
4. If the ground is low in mineralization (rare)
you may want to set the MODE to the LOW
position, squeeze and release the TRIGGER on
the handle and repeat step 3 (AUTO GEB). If
you were mistaken about the ground being low
in mineralization, the detector will respond to the
ground (false signal) and otherwise act unstable
and unpredictable. If this occurs you should switch
back to the HIGH position, squeeze and release
the TRIGGER on the handle, and repeat step 3
(AUTO GEB). You can then resume searching. If
the SIERRA MADRE works smooth, stable, and
predictably at the LOW setting, then continue to use
the LOW position in that type of ground.