sewerin UT 9000 - 5 Active Location: Lines; Determining the Ambient Noise

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5 Active location: lines
5 Active location: lines
In active location, a generator is used to produce an electromag-
neticeldaroundthelinetobelocated.Theenergisedlinecan
then be located.
Carry out the following steps to locate a line using active location:
1. determine the ambient noise
2. energise the line
3. locate the line
5.1 Determining the ambient noise
Lines are often surrounded by frequencies which can make loca-
tionmoredifcult(interferencesignals).Theambientnoiseneeds
to be determined in order to be able to select a suitable frequency
for energising and locating the line despite these interferences.
The process consists of the receiver testing which enabled fre-
quencies are found in the surroundings and at what strength.
Ambient noise can only be determined in the following location
types:
● line (active location)
● current (passive location)
Suitability of a frequency for location
Location
mode
Location
type
Signal strength (interference signal)
high low
active line
unsuitable
frequency
suitable frequency
passive current
suitable frequency unsuitable
frequency