sewerin DUOPHON Betriebsanleitung Seite 40

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With the fine tuning (Item 12) the signal quality can be adjusted.
The minimum will be received exactly above the pipeline. Thus its
trace can be followed.
MAXIMUM METHOD
For the application of the maximum method the search coil will be
clicked into 90 degree position (refer to pict.6)
The magnetic field of force produces a course of signals as
pictured. This can also be controlled via the meter (Item 16) and the
earphones (Item 9).
Using this method the maximum indicates the pipe position.
However, with the minimum method the position of the pipe can be
detected more exactly since the sharply defined minimum can be
better received than the less distinct maximum.
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Pict. 6
Maximum method