Cubic 156-PMD, Operation Manual

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f. Occasionally an area is encountered where it is difficult to keep the mine detector in
the SEARCH mode, that is, as soon as a sweep, is started following the automatic reset
to SEARCH mode, a chirp is heard again. This could be due to a sudden change in soil
characteristics and can be countered as follows: Step back about 3 feet (1 m) into the
area previously cleared and set the switch to the OFF position. Then set the switch to
the ON position following the standard search procedures described in paragraph 3-2,
and sweep the area again. If an area without visible anomalies consistently seems to
produce a large number of false alarms, the mine detector can effectively be made less
sensitive by sweeping at a slightly higher distance above the ground.
3-4
Stopping.
To
shut down the equipment, set the switch to the
OFF
position. Always set the
switch to the OFF position when the mine detector is not in use, even for short periods
of time.
3-6