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If you can no longer trace the path, even with the GAIN set to maximum, connect the
T
ransmiTTer
to the far end of the path and trace back to the point where you lost the signal.
Mark the 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
r
eceiver
'
s
PEAK and NULL
indications to behave differently than when tracing a straight path. Practice on the path that
you know has turns and laterals in it. This will help you to recognize the conditions within the
field.
Trace the path by walking away from the
T
ransmiTTer
at a moderate pace. Move the
r
eceiver
to
the left and right while walking, following the PEAK indications.
As you trace the path, the PEAK meter reading may slowly fade as you move away from the
T
ransmiTTer
.
Press and release the GAIN buttons as needed to compensate for changes in level (higher or lower).
One of the following may have occured at areas of detected signal loss:
a) a junction where the signal divides and goes several directions.
b) a break in the cable or shield.
c) a change in the depth of the cable or pipe.
d) an insulated pipe fitting.
e) a slack loop of cable.
Move the
r
eceiver
left to right across the cable path. When the
r
eceiver
is directly above the cable or pipe, a NULL (lowest meter reading and lowest audio
tone) will occur. When moving the
r
eceiver
to left or right of the NULL point, the
meter reading will rise to a maximum point (PEAK). The audio tone will also be at its
highest pitch. When the
r
eceiver
is moved beyond the PEAK, the meter reading will begin to
fade.
Trace the path by walking away from the
T
ransmiTTer
at a moderate pace. Move the
r
eceiver
to
the left and right when walking, following the NULL indications.
It is expected that in areas of distortion and interference the Null locating mode will have a
greater error rate than the Peak locating mode.
n
ull
m
ode
l
oCating
Null Mode
Buried cable
Buried cable
Signal over cable
Peak Mode
(End view)
Receiver Max
(End view)
Receiver Min
Signal over cable
