White’s Electronics Surfmaster DualField - Manual (Page 5)

5
Controls
Chapter 3 Surf Dual Field Controls
As the Pulse Timing Control is moved clockwise, it
increases the delay of the sample pulses that detect
targets, and reduces the ground noise from black
sand. However, if the control is increased too far
clockwise it will reduce the detectors's sensitiv-
ity for small jewelry and coins you should use the
lowest control setting required to minimize ground
noise.
Under most circumstances, you should dig every
signal. However when you find yourself searching
an area that is littered with bits of aluminum foil
you can advance the Pulse Timing Control to ignore
the foil and still detect shallow US nickels. At this
control setting you will lose deeper nickels and
some gold jewelry and the depth for other coins will
be reduced by about ten percent.
T-HOLD
The T-HOLD is used to adjust the background hum
(threshold). The threshold is the low hum you hear
when you are not detecting a target. The T-HOLD
should be adjusted so that you can hear a slight hum
(edge of sound). If the hum is set too loud, it may
mask some of the deeper targets. If it is set too low,
some of the deeper targets may not be heard. The
T-HOLD also functions as a sensitivity control.
Setting it for silent operation will reduce sensitiv-
ity eliminating noise from nearby detectors or other
electrical sources, however, some reduction in
detection depth can be expected.
We could have made the threshold “preset” at the
factory. We chose not to because no two people
hear things the same way. When you are hunting in
dry sand in a quiet area, you can set the threshold
very low. If you are near the surf or in a noisy area,
you may have to increase it slightly to hear it.
THE TRIANGLE REPRESENTS
THE OPTIMUM SETTING THE
FACTORY RECOMMENDS FOR
MOST SEARCHING
GAIN
The GAIN control turns the power ON and OFF
and is used to select the responsiveness (sensitivity)
of the Surfmaster Dual Field.
High ground mineralization or electrical interfer-
ence in the search area may require a decreased
level of Gain to stabilize responses to be both pre-
dictable and reliable.
Low mineralized areas and/or areas of little elec-
trical interference may require increased levels of
Gain for the best performance. At the maximum
setting some instability may be expected depending
upon electrical noise in the area. The recommended
setting is the furthest clockwise setting that allows
smooth predictable responses.
PULSE TIMING
The Pulse Timing Control can be adjusted to reduce
the effects of mineralized ground that can cause
false target signals. The control is very useful in
minimizing ground noise on beaches containing
large amounts of black sand or regions with sand
derived from volcanic rock. If the ground does not
cause false signals the control should be set at mini-
mum for optimum performance.