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overcome resistance and inject more current onto the line.
e.
f.In extremely dry soil, wetting the area around the ground stake will improve the circuit. Be aware the moisture will dissipate and evaporate, reducing the quality of the circuit over time.
5.Using the numeric Signal Angle Indicator is another way to check for distorted signals. Move the
Note: Another technique is to move the same distance to the right and left of the traced line, say 24 inches (60 cm) and check that the Signal Strength readings are similar.
6.While tracing, the Proximity Signal and Signal Strength should maximize, and the Measured Depth minimize, at the same place where the guidance arrows center on the display. If this is not the case, the utility may be changing direction or other coupled signals may be present.
A =same distance
45° | 0° | 45° |
AA
Ground
45° 45°
A
Energized Pipe
Figure 27: Checking for Distortion
7.Higher frequencies bleed over to adjacent utilities more readily, but may be needed to overcome breaks in tracer wires or go over insulating couplers. If the line is ungrounded at the far end, higher frequencies may be the only means to make the line traceable. (See Informational Locating, on page 39).
8.When using the transmitter inductively, be sure to begin the locate about 30 feet (10m) away to avoid “direct coupling” (also know as air coupling). This occurs when the
9.While tracing, the mapping display operates best under the following conditions:
a.The line is level
b.The
c.The
If these conditions are not met, pay close attention to maximizing Signal Strength.
In general, if the
See the section on Suppression on page 32 for information on noise suppression options.
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