RECEIVER OPERATION
AVTM651070 Rev B Nov 2006
25
90
°
while over the cable, a sharp null will identify the cable direction, which will
be aligned with the flat side of the receiver.
Trace the path by observing the peak indications while walking away from the
transmitter at a moderate pace.
As you trace the path in a direction away from the transmitter, the Peak meter
reading will slowly fade. Press and release the GAIN buttons as needed to
compensate for losses in Peak signal level. If the Peak meter reading suddenly
changes in level (higher or lower), you may have found one of the following:
1.
A junction where the signal divides (lower)
2.
A break in the cable or shield (lower)
3.
A change in depth of the cable or pipe (higher or lower)
4.
An insulated pipe fitting (lower)
5.
A slack loop of cable (lower)
If you can no longer trace the path, even with the gain set to maximum, connect
the transmitter to the far end of the cable, and trace back to the point where you
lost the signal.
Mark straight sections of the path every few feet. Mark sharp curves, loops, and
cable bundles every few inches. Sharp changes in the path cause the receiver
Peak and Null indications to behave differently than when tracing a straight path.
Practice on a path that you know has turns and laterals in it, so you will recognize
these conditions in the field.
Null Mode Locating
When in the Null mode, gently swing the receiver across the cable path as you
would when in the Peak mode. However, in the Null mode, all indicators will be
at a minimum when the receiver is directly above the cable or pipe. When the
receiver is only a small distance to the left or to the right of the target cable, all
indicators will be at a maximum. When the receiver is farther away to the left or
right of the cable, all indicators will begin to fade.
Trace the path by walking away from the transmitter at a moderate pace. Gently
swing the receiver left and right as you walk, following the Null indications.
As you move away from the transmitter, the maximum meter readings may
slowly fade as was described for the Peak mode. If the maximum meter reading
suddenly changes in level (higher or lower), you may have found one of the
following:
Summary of Contents for L1070
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