Controls; Sensitivity - White's GOLDMASTER Series Owner's Manual

GMX Controls

Controls

The UP and DOWN buttons control the SENSITIVITY. Each press on the UP button in-
1.
creases from a minimum level of "0" to a maximum level of "10". Please note that levels 0-9
adjust the system gain, and that setting 10 enables an Audio Boost for maximum sensitivity.
2. Average ground conditions will generally allow for settings of 5-7 on the SENSITIVITY
setting. In mild ground you may be able to run as high as 10, and in extreme ground you may
need to lower the sensitivity to under 5. If the GMX overloads, the sensitivity is set too high!
One way to look at the SENSITIVITY control is like the accelerator in your car. Sometimes
3.
you have to ease off for better control, and other times you can go "full throttle" for maxi-
mum performance.
8
Current

Sensitivity

Level
Sensitivity
Increase
Sensitivity
Decrease
Sensitivity Adjustment
Sensitivity Control
With the SENSITIVITY control, you
increase the signal strength coming from
the ground. You might expect increased
signal strength to always find more nuggets
at greater depths. However, high ground
mineralization will "bounce" the signal
back and mask good targets. It is therefore
necessary to ADJUST the SENSITIVI-
TY to give you the maximum allowable
SENSITIVITY without masking targets or
over-loading the circuit and at the same
time allowing you to operate the detector
with a constant threshold hum so that faint
signals can be detected.
This is where the GMX can help you out.
When ground mineralization is too high for
the current SENSITIVITY control setting,
the display shows you a series of lines
along with an audible "alert". Reduce the
SENSITIVITY till the overload warning
ceases. On occasion, while searching, you
might go over a very large or very shallow
target. This will result in the same type
of behavior. Lifting the coil higher may
reveal some information on the target. You
still might want to dig it up!