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5. Move the receiver from side to side over the targeted conductor location until you obtain the
maximum PEAK response. For better signal reception, hold the receiver close to the ground.
As you move closer to the targeted conductor, the speaker tone will gradually get louder. The
loudest tone will indicate you are over the conductor in the PEAK mode.
6. If the needle is at or close to the end of the meter scale, adjust the SENSITIVITY knob to bring
the needle back to the middle of the meter. (Decreasing the SENSITIVITY will give a sharper
receiver response as you move closer to the target conductor.) Then move to a new position
and note the meter response. The meter reading will increase if the signal gets stronger (closer
to the conductor), or decrease if the signal gets weaker (further from the conductor).
7.
Keep adjusting the SENSITIVITY knob and the position of the receiver until you find a place
that gives a maximum reading. (This will occur when the receiver forms an angle of 90
degrees with the target conductor.)
5.6
Estimating the Depth of a Conductor
Follow this procedure to estimate the depth of a buried conductor:
1. Using the NULL method, find the exact location of the conductor. At a minimum distance of 35
feet from the transmitter (to prevent air coupling between the transmitter and receiver), locate
and mark the conductor.
2. Then, still in the same mode of operation (NULL), tilt the receiver to 45 degrees (aligning the
bubble), and move off to the side of the conductor. See below graphic.
Estimating the Depth of a Conductor
3. When you "locate" the conductor a second time, with the receiver at a 45 degree angle, mark
the spot on the ground. The distance between this second spot and the true location of the
conductor (A), less the distance between the center of the receiver and the ground (B), is
equal to the depth of the conductor (C). See graphic above.
4. Measurement accuracy is affected by the ratio of the conductor diameter compared to how
deep the conductor is buried. (The larger the pipe the less accurate the depth measurement.)
Depth measurements are also affected by soil conditions, overhead lines, and adjacent
conductors.
Rx
45°
B
A
C = A·B
PIPE
C
C (Depth of Conductor) = A-B
Second “Location”
Pipe Location
5 Operation
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