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Tracing with BM 30
The parallel menu allows a determination of cable route. The black stripe at the housing of
microphone shows the parallel direction of cable route.
Enter the parallel menu through pressing OK on Magnetic Signal.
Rotate the BM 30 on his own axe. The Ratio bargraph is changing. Try to detect the
maximum. If maximum of bargraph found the black stripe is parallel to the cable.
Attention: Pipes in earth as well as metallic objects on surface could affect this method. In
worst case results could be inverted.
6.2 Distance
manhole
If no breakdown can be heard from a cable within a pipe (over a bridge or similar buildings)
the distance manhole method has be done.
Choose „Distance manhole“ in „acoustic location“ menu and follow step by step the displayed
instruction.
Summary of Contents for TG 20/50
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