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Signals picked up by the receiver get weaker as you move further and further away from the transmitter
coupling point, especially on long pipe runs. To get a stronger signal, move the transmitter coupling point
closer to the receiver. If forced to use the Inductive Indirect mode, your tracing job will be easier if an
assistant follows behind with the transmitter as you trace with the receiver.
5.7 Locating a Service Lateral - Active Range/Inductive Mode
After you have traced the main, you may want to go back and locate the service laterals off the main.
Service lateral traces are easiest to conduct in the Inductive Mode. Two operators are required for this
procedure - Operator 1 remains stationary holding the Receiver as if to trace over and parallel to the main.
Operator 2, carrying the Transmitter, holding it perpendicular to the main line, and maintaining a minimum
of 100 ft. between himself and the Receiver, walks parallel but 5 feet from the main on the side he expects
to find the service laterals as shown in Figure 5-1. The meter reading on the Receiver will increase
as Operator 2 crosses over the service lateral with the Transmitter. Each time the meter reading increases
Operator 1 signals Operator 2 and he/she marks the lateral locations on the ground.
Figure 5-1: Locating Service Laterals
5.8 Locating a Bend or Dead End
While tracing a line, you may find that the meter reading drops off suddenly, and that there is no distinct
reading when the receiver antenna is moved left or right. Stand in place and continue sweeping the antenna
from side to side but at the same time slowly pivot your body.
