Radio Mode - Passive Location Of Utilities; Induction Mode - Locating Utilities - Amprobe UAT-505 Guide D'utilisation

3.3 Radio Mode – Passive Location of Utilities
Radio signals are created by low frequency radio transmitter and are used
for broadcasting and communications. They are positioned throughout the
world. As the frequencies are very low, the signals tend to penetrate and
hug the curvature of the earth. When the signals cross a long conductor
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such as a pipe or cable, the signals are re-radiated. It is these re-radiated
signals that can be detected by Radio Mode.
Locating radio signals is very similar to detecting power signals as they are
both passive. With the Radio Mode method, you will detect metallic utilities,
such as pipes, as well as energized and de-energized cables. Tracing of
non-metallic pipes and conduits will be possible after inserting metal fish
tape or cable.
1. Turn the Receiver on by pressing the power button for two seconds.
2. Press the " " button repeatedly until Radio is selected.
3. Follow the steps as described in the Receiver Locating section 3.1.
The Left/Right arrows are not active during passive location
3.4 Induction Mode – Locating Utilities
Induction Mode is particularly useful for identifying the location of multiple buried utilities before digging. Induction
Mode can be also used for tracing individual cables where there is no access to the line to connect test leads or a
clamp. However, this method may not be reliable if adjacent lines are present because the signal will be also applied
to these lines.
Without the test leads or signal clamp connected to the Transmitter, the Transmitter will automatically start to radiate
a signal around it using an internal antenna. These signals will penetrate the ground and couple onto buried lines. The
signal will then travel along the line which can be detected with the Receiver.
With the Induction Mode method, you will detect metallic utilities, such as pipes, as well as energized and de-energized
cables. Tracing of non-metallic pipes and conduits will be possible after inserting metal fish tape or cable.
Induction Mode – Setting Up the Transmitter
When using Induction Mode, place the Transmitter at least 65 feet (20 m) away from any structure such as building or a
tower to avoid signal interference. Before tracing, take a visual inspection of the area looking for clues were the buried
utility might be present, such as transformers, manholes, street or parking lamps, etc.
> 65 ft (20 m)
The signal will radiate around the Transmitter as well as below it, so it is recommended that when applying a signal
using Induction Mode, a distance of at least 65 feet (20 m) is kept from the Transmitter when pinpointing or taking depth
readings. While locating closer than 65 feet is possible, the operator should be aware that the signal directly received
from the Transmitter may be strong enough to influence the results.
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