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10 Glossary
10. Glossary
Active Locate A locate where a transmitter is used to apply a signal to a buried pipe or cable, the position of
which is then located by a receiver tuned to the same frequency.
Active Signal A signal applied by the locator transmitter to a buried line. Typical this is a very precise
frequency.
Attenuation The reduction of an electromagnetic signal from a pipe or cable.
Clamp (or Coupler) An accessory used to apply the transmitter signal to an insulated line, removing the need to
connect the transmitter signal directly to a conductor or cable sheath.
Compass Line direction indicator (although visually like a compass, this is the only relation to a
compass.)
Coupling
The act of signals transferring to lines to which they were not originally applied. Coupling
can be “direct” where the target line has an electrical connection to another line, or “induced”
where the signal radiates from the target line to another line or lines.
Display The information visually available on the dot matrix display.
Line A generic term for any buried pipe or cable.
Null
A minimum response to a buried line.
Passive Locate A locate where the receiver searches for a wide range of signals that radiate from buried pipes
or cables. These signals come from a variety of sources in the environment and couple to the
buried (& overhead) lines. Typical examples 50 / 60Hz and LF/VLF radio.
Passive signals A wide range of signals that radiate from buried pipes or cables. These signals come from
a variety of sources in the environment and couple to the buried (& overhead) lines. Typical
examples 50/60Hz and LF/VLF radio.
Peak
A maximum response to a buried line.
Pinpoint Using a receiver to identify the exact position of a buried line.
Response The indication that the receiver gives which is caused by the signals it is receiving. This can
be visual, audio or both. Typically, it is displayed on the locator’s dot matrix display and audibly
from a loudspeaker in the receiver housing.
Search (sweep) This describes the act of looking for a buried line within a given area.
Sonde A small transmitting coil which may be built into a product such as a sewer camera or
packaged as a small self-contained battery powered transmitter. A receiver tuned to the same
frequency can locate the position of the Sonde and hence whatever it is attached to or in.
Frequently used for locating sewer cameras, and the non-metallic pipes.
Target Line The buried pipe or cable to be located.
Trace Using a locator to follow the path of a buried line.
Illustrations used in the preparation of this manual will inevitably show some resemblance to similar illustrations from other
Manufacturers-some manufacturers have given permission for the use of their graphics (Vivax-Metrotech & Seba) is given credit
for these use. This statement is intended to attribute such credit.
Disclaimer: Product and accessory specification and availability information is subject to change without prior notice.
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