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10 Glossary
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 signa l 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 signales 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
locators 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.
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