Determining Conductor Depth By Triangulation - Fisher Labs TW-6 Operating Manual

MODES OF OPERATION
DETERMININING CONDUCTOR DEPTH BY TRIANGULATION
This procedure is only accomplished when the transmitter is close
enough for the receiver to receive a strong and clear signal.
Once you have determined the exact centerline of the conductor
(either Inductively or Conductively), place the receiver above and
parallel to it. Hold the receiver as close to the ground as possible.
Now, tip the receiver back until the bubble inside the depth level
indicator rests between the outer edge of the center ring and the
black border of the level.
ground. Care should be taken at this point, as a few degrees of
conductor centerline. Now, back away slowly, at a right angle
to the conductor, keeping the bubble as steady as possible. The
meter indication should manually be adjusted by means of the
sensitivity control to stay on scale in order to observe the point
where the needle will fall to a minimum signal. After this point, the
signal begins to increase again.
Position the receiver at the minimum or null point. Measure the
of the fastener, which holds transmitter and receiver together. This
distance, minus the distance of the center of the locator loop
If the conductor is buried in sloping ground, make a depth
determination on each side of the conductor and average the
A tracer probe with its smaller receiver coil in the tip, is quicker
and easier to use, hence it yields greater accuracy in depth
when using the receiver or receiver with tracer probe.
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