8. When the probe of the receiver passes the location of the cable or line break, both
indications of received signal amplitude will show a sharp reduction and then disappear.
At this moment, press the
MANUAL
button on the receiver (Fig. 4, Callout 8) and move the
probe slightly back in the opposite direction.
9. With the receiver now in manual cable locating mode, press the
▼
button to begin reducing
the receiver’s sensitivity. Continue to move the probe in the original direction until the LCD
loses the transmitting code, and then move the probe back slightly. If the LCD never loses
the code, press the
▼
button again to further reduce the receiver’s sensitivity and then
move the probe again. The point at which the receiver’s LCD can barely display the
transmitting code is the location of the cable or line break.
Locating a Socket, Switch or Junction Box or Tracing a Line
Before performing the following procedure, make sure the circuit is dead (unpowered) and that
its neutral line and ground wire are connected and fully operational. Any exposed grounding
terminal can be used to ground the transmitter. For line tracing applications, the typical maximum
depth is 7 ft.
To locate a circuit component or trace a line:
1. Attach the supplied red alligator clip or red test
probe (depending on the application) to the
transmitter’s red test lead and then connect the
clip or probe to a component known to be part of
the circuit, as in Fig. 7.
2. Attach the supplied black alligator clip or black
test probe to the transmitter’s black test lead and
then attach the clip or probe to an auxiliary
ground, a ground terminal of a grounded socket, or
a properly grounded water pipe.
3. Follow Steps 3 through 9 of the procedure detailed
in “Locating a Cable or Line Break Behind a Wall”
on p. 8. Remember that if the cable fed by the transmitter runs in parallel with other
conductors (for example, in a cable duct) or if those conductors are crossed, the
transmitter’s signal is also carried by those other conductors.
4. As in the previous application, a component or line can be precisely located by adjusting the
transmitter’s output power and then operating the receiver in manual mode and adjusting its
sensitivity. In both of these applications, the stronger the signal received, the closer the
receiver is to the component to be located or the line to be traced. When tracing a line, an
abrupt decline in received signal power indicates a line break.
9
Fig. 7. Locating a Socket, Switch or
Junction Box or Tracing a Line