CST/BERGER Magna-Trak 102, Инструкция по эксплуатации

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Theory of Operation
The Magna-Trak 102 locator fi nds ferromagnetic objects by sensing
the magnetic fi eld radiated by the object. The locator contains two sen-
sor coil assemblies that are precisely spaced and electronically balanced
to achieve a near magnetic balanced operating condition. In a uniform
magnetic fi eld, such as the earth’s fi eld, the two sensor coils maintain
a magnetic balanced status, because both of the coils experience the
same magnetic lines of force. However, when a ferromagnetic object is
approached the fi eld strength and angle of the magnetic lines upon each
sensor is different. This difference, although minute, is enough to offset the
critical balance and produce an audible indicating signal.
When no ferromagnetic objects are present, the speaker emits a steady
low frequency tone. As the object is approached, the audio frequency in-
creases until the center of the object is directly beneath the locator’s lower
tip. The frequency peaks and then decreases as the object is passed. The
peak indicates the exact location of the object.
Nonferrous objects do not effect the locator. Objects made of brass,
aluminum, copper, etc. are ignored.
Sensor coils unbalanced by iron stake’s magnetic fi eld.