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6 Glossary
6. 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, is the only relation to a compass.)
Coupling
The act of signals transferring to lines to which they were not originally applied. The 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
The Receiver searches for a wide range of signals that radiate from buried pipes or cables. These
signals come from various sources in the environment and couple to the buried (& overhead) lines.
Typical examples are 50 / 60Hz and LF/VLF radio.
Passive signals
A wide range of signals that radiate from buried pipes or cables. These signals come from various
sources in the environment and couple to the buried (& overhead) lines. Typical examples are
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 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 that 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. Sondes are frequently used for
locating sewer cameras and tracing non-metallic pipes and ducts.
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 this manual's preparation will inevitably show some resemblance to similar illustrations from other
manufacturers. These manufacturers have permitted the use of their graphics. This statement is intended to attribute such credit.
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Disclaimer:
Product and accessory specification and availability information are subject to change without prior notice.
