Dunham & Morrow DML2000 Manual do utilizador - Página 5
Procurar online ou descarregar pdf Manual do utilizador para Instrumentos de medição Dunham & Morrow DML2000. Dunham & Morrow DML2000 13 páginas. Magnetic locator
Theory of Operation
The DML2000-XR Magnetic Locator uses fluxgate magnetometers to
detect
and
measure
the
local
magnetic
field.
Fluxgate
magnetometers are vector magnetic field sensors that measure the
average magnetic field component along their sensitive axis, i.e. the
magnetic field component along the longitudinal axis of the sensor
tube.
For a magnetic locator to work properly, two magnetometer sensors
are required. One sensor measures the positive magnetic field, and
the other sensor, located 20 inches away, measures the negative
magnetic field. The instrument then sums the output of the two
sensors. By summing the two output signals, you cancel any field
common to both sensors, such as the Earth's Magnetic Field, and
leave only the differential magnetic field. The differential magnetic
field, the magnetic field detected by one sensor and not the other, is
the magnetic field of interest.
Magnetic Cleanliness
The importance of the operator's magnetic cleanliness prior to
beginning a search cannot be overemphasized. Some of the more
common sources of local magnetic interference are watches, key
chains, pocket-knives, cell phones, belt buckles, and steel arch
supports or toe protectors in shoes.
Figure 1: Sensor Location
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