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Tempo Communications
Larger nicks in the wire can be
located in almost the same way
as locating opens. Follow the
null and strong signal along the
sides of the wire until the signal
becomes very weak along the
sides of the null. This will occur
within a relatively short distance.
The transmitted signal bleeds to
ground at the nick and then wants
to return to the ground stake along
the outside of the wire itself. The
majority of signals will stop at the
nick indicated by the low receiver
reading just beyond the nick. (Refer
to Figure 4.)
Figure 4. Locating Wire Nick
• To more accurately define the location of an open or larger nick (ground
fault), position the receiver tip on the ground near the point where the last
strong signal was detected along the side of the path. The receiver tip should
be pointing at the ground and be approximately 6 inches to either side
from the null. Because you are so much closer to the path, the sensitivity
knob must be adjusted down until the meter reads just below 100%. While
maintaining the 6-inch distance from the null, move the receiver down the
line, paying close attention to the meter reading. Once you pass the open or
nick, the meter will fall off rapidly.
Determining the Depth of a Wire
To determine the depth of the
wire, first mark the ground directly
over the path. Turn the receiver
sideways to the path, and tip it 45
degrees. When close to 45 degrees
from the vertical the "45 degree"
indicator will illuminate in the
display. Move the receiver directly
away from the pre-marked path,
maintaining the 45-degree tip until
a null is detected. Mark this spot.
If possible, repeat on the opposite
side of the route. The depth is the
average of the distances between
the path of the cable and each of
the marks. (Refer to Figure 5.)
Figure 5. Determining Depth
521E Instruction Manual
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