Dunham & Morrow DML2000-XR Manual del usuario - Página 5

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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