Banner DF-G1-PR-Q7 Instrukcje Operacyjne Strona 214

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C – Cables and Tones
DPN 402197 © TSS (International) Ltd Page 1 of 4
C CABLES AND TONES
The target cable must carry a suitable tone signal before the 350 System can detect
it. This tone signal should have the following characteristics:
It should be easy for the 350 System to identify it among other signals that the tar-
get cable or other cables in the survey area might be carrying.
It should have a frequency within a ‘quiet’ part of the pass band of the 350 Sys-
tem.
The tone current should be of sufficient amplitude to provide a signal that is above
the background noise level.
The 350 System can survey cables of any length. You may improve the effectiveness
of the System if you select a suitable tone frequency and current for the specific
cable. This appendix offers some basic advice on a method for injecting a tone onto a
target cable so that you may use the 350 System to perform the survey.
TSS can supply a tone generator for use with the 350 System. Refer to TSS for
advice if necessary.
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