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Continue along the cable/pipe path, re-inserting the frame probes every few
steps while watching the receiver bar graphs. The bar graph on the receiver
will fill toward the right side of the screen (green), indicating that the fault
is ahead of the operator (in the direction of the green-banded leg of the 3M
™
Dynatel
™
Earth Contact Frame).
Transmitter
Signal
Green
Band
Red
Band
When the bar graph fills toward the left (red) side of the screen, the fault
has been passed and is now behind the operator. Move back, inserting the
frame every few inches, until the arrows alternate back to green. Mark the
point beneath the center of the frame. Turn the earth frame 90 degrees and
insert into the ground over the previously marked point. Move the earth
frame to the left and right (following the directions of the green and red
indicators). When the arrows reverse a third time, turn the frame 90 degrees
again. Pinpoint the fault by moving the frame in the direction of the green/
red arrows. The fault is located beneath the center of the frame when the
arrows change from one side to the other this time.
Figure 2
To verify the fault location, insert the frame’s red probe directly on the spot
identified above. Pivot the frame in a circle around the red leg re-inserting
the green leg in the ground every few degrees of the circle (Figure 2). The
arrow should always point toward the left (red) indicating that the fault is
directly below the red leg.
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