Vivax Metrotech vLocDM, Руководство пользователя

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Sometimes it is not possible to gain access to the pipe position. If this is the case walking along the route of
the pipe a few meters to one side can very often produce good results. This procedure is also useful where the
pipe runs under “blacktop” which acts as an insulator preventing the A-frame from making a good connection to
ground.
Road (Black T
op)
6.6.3 Using the A-frame where there are Many Defects Such As Porous Coating
Poorly coated pipelines such as old bitchumin coating, may create a confusing result when as multiple defects
will interfere with each other. To overcome this, it is sometimes beneficial to adopt a different approach.
This alternative approach involves using the A-frame perpendicular and to one side of the pipeline. See
diagram below:
6 Using the vLocDM Receiver