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Theory of Locating - C
able Locators consist of a transmitter
and a receiver. In the case of the Pro800D model, the transmitter
is the long black box and the wand is yellow and black. In
operation, a transmitter places a specific frequency signal onto the
metallic conductor you are trying to trace. This placing of an AC
signal onto a cable produces an electrical current and an
electromagnetic field around that cable. If the wand is close
enough, this signal is received and amplified by the wand.
It is very important to understand that the circuit you are creating
follows the laws of physics and electricity. A cable transmitter
creates an electrical current (AC) that travels down the cable,
through grounding to the earth, and then back to the transmitter
through the ground stake. The tracing signal will always travel on
the path of least resistance. If there is too much resistance or no
circuit path, no current will flow and no locate will be possible. So
keep in mind that when a signal is heard, it is because the signal
has a complete path that is creating an electrically friendly way for
the signal to travel back to the transmitter. The signal doesn't just
randomly wander through the dirt. It follows a path provided for it,
whether it is a pipe, wire, reinforcing bar, etc.
It is also important to note that in the tracing circuits, a return path
needs to be present. Basically, the return path completes the
circuit. In most cases, this will be the earth ground as the signal
transmits down the cable and returns to the ground stake.
However, any return is possible, so a common wire could work. Or
if you have a looped wire, like a dog fence, the loop itself returns
to the start and therefore provides a 'ground' instead of the ground
stake. You don't have to use a ground stake but you do have to
give the signal a way to return to the transmitter.
The Pro800D uses 8 "D" sized batteries, located inside
Battery -
the transmitter battery compartment. For the Pro800D, similarly
remove the battery compartment cover and install the batteries,
paying particular attention to the positive and negative poles.
A 9 volt square battery is used in the receiver. To install this
battery, remove the battery compartment cover located on the
back of the Pro800 receiver. It is sometimes helpful to use a flat
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