78-8130-6151-8-E
17
Induction Method
If you cannot make a direct connection, or use the 3M
™
Dynatel
™
Dyna-Coupler clamp
to apply a locating signal on the target, use the induction method. This method uses the
internal coil of the transmitter to generate a magnetic field. This is the least preferred
method of applying a signal on a target conductor because it can easily be picked up by
other non-target conductors in the area. However, it is the preferred method of applying
a signal to multiple cables/pipes in the same trench, and for the ‘two-man sweeping’
application.
1. Verify battery level of transmitter and remove any cables from the output jack.
2. Position the transmitter over the target facility with the hinge of the transmitter over
and in line with the cable/pipe path.
3. Align the Induction Direction arrows on the transmitter with the target conductor.
4. Turn on the transmitter by pressing the
Trace
[T-3] key.
5. Press
Trace
[T-3] again to select 33 KHz or 133 KHz.
6. Select High Output level for the best signal-to-noise ratio.
7. Trace the signal path with the receiver using the Induction Peak mode.
The induction mode of the receiver is a mode in which the upper antenna of the receiver
is tuned to minimize distortion from the magnetic field of the transmitter.
Note: The receiver must be at least 25 feet away from the transmitter to begin tracing
the target path.
