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Adjusting the Sensitivity of the Sensor
Adjust the sensitivity of the sensor such that the rela-
tive maximum of the signal fluctuates above the signal
of the object by the value 60 – 70.
With this setting, the exact position of the sought
object can be determined relatively well, as the mag-
netic fields of smaller metal objects or the surround-
ings can be excluded.
When several objects lie next to each other, reduce
the sensitivity of the sensors in steps until receiving
signal peaks that can be clearly differentiated from
each other.
MT100/MT 102: Adjust the appropriate sensitivity of
the sensor by turning adjustment knob 1.
MT200/MT202: Press buttons 15 to adjust the
desired sensitivity of the sensor. The "+" button
increases the sensitivity of the sensor and " – " button
reduces it.
When switching off the measuring tool, the selected
sensitivity of the sensor is retained in the memory.
Method of Operation
Audio Signal
A deep audio signal sounds when no ferro-magnetic
object is in the operating range. When locating such
an object, the frequency of the audio signal increases
analogue to the signal intensity.
The signal intensity depends on the following factors:
– Sensitivity of the sensor
– Size of the object
– Position and depth of the object
– Environmental influences
Numerical Signal Indication
The numerical signal indication 7 displays values rang-
ing from "0" to "99".
When no ferro-magnetic object is within the operating
range and the lowest sensitivity of the sensor is set, a
value between "0" and "5" is displayed. An increasing
of the value signals the approaching to a ferro-mag-
netic object and allows for conclusions to be drawn as
to object depth, range and size of the located object.
MT202: A "+" or " – " in front of a value indicates the
polarity of the object. Whereby "+" corresponds with
the north pole and " – " with the south pole.
Analogue Signal Indication (Bar Diagram)
The bar diagram 9 expands analogue to the signal
strength from the centre outward.
MT202: The direction in which the bar diagram 9
strikes out, indicates, on which side of the measuring
point the centre of the object is located.
12 | English
Power-line Indicator (MT102/MT202)
Electromagnetic fields from high-voltage cables under
ground are registered by the tool electronics and con-
verted to a flashing signal.
The indication 5 ("Caution Power Line") appears on
the display 6.
The distance or the detection range depends on the
energy being transferred in the cable. When the cable
does not conduct current, it is not detected. The
measuring tool only responds to current frequencies
of 50 – 60 Hz.
The power-line indicator function is automatically
active as soon as the measuring tool is switched on.
It is not intended specifically for the detection of
power cables.
Erase Function (MT102/MT202) (see figure A)
The erase function enables the detection of ferro-
magnetic objects that are in direct vicinity to metal
fences, iron railings, reinforced concrete walls, vehi-
cles, track systems, etc.
MT102: Press the erase button 11. The interfering
magnetic field is suppressed and the value of the
numerical signal indication 7 is set to "0".
MT202: Press the erase button 11. This reduces or
increases the sensitivity of the sensor so that the value
of the numerical signal indication 7 is "60". The result-
ing margin enables a more accurate search.
In case of accidentally pressing the erase button 11
over an object that you are trying to locate, swing the
measuring tool aside, press the erase button 11 again
and continue with your normal search.
Working Advice
The measuring tool enables you to locate ferro-mag-
netic objects outdoors.
Non-magnetisable objects such as plastic or metals
such as aluminium, copper, gold silver, etc. cannot be
detected.
Coarse Detection (see figure B)
Hold the measuring tool at an angle of 45° to the
ground surface and move it left and right while walking
over the terrain.
Note: Pay attention that the clearance to the ground
surface is low and remains uniform.
Fine Detection (see figure C)
When a ferro-magnetic object is localised, hold the
measuring tool vertical to the ground surface and
determine the centre of the object by moving the
measuring tool crosswise with short strokes.
The exact position of the ferro-magnetic object results
from the respective maximum signal amplitude.
2 610 A15 110 • 23.6.09
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