4 – Operating Procedure
DPN 402197 Issue 7.1
© Teledyne Limited
4- 1
4 Operating Procedure
In common with other items of precision equipment, you may rely on the quality of data gathered by the
350 system only if you follow the correct operating procedures when you use it.
This section of the manual considers the role that the 350 system plays within an overall survey
operation. The sub-sections follow a typical survey operation in sequence: It begins with the
preparation necessary before the survey, includes some operational considerations, and ends with
some suggestions for the effective use of the quality control information.
NOTE
To allow for meaningful analysis of the acquired data, the 350 system allows you
to keep a record of the system configuration during a survey. The DeepView oper-
ating software generates this information and makes it available for editing and
printing through the Windows Notepad application.
4.1 Pre-Survey Preparation
At an early stage during the planning procedure the survey planning team should decide whether to
use a 350 system. By making this decision early in the planning process they can assign the correct
equipment and personnel to the operation.
Contact Teledyne Limited for advice if you are unsure whether the 350 system is suitable for use in a
particular survey application.
4.1.1 Training
When used properly, the 350 system 350 System is a precision survey tool that provides valuable and
detailed survey data to describe the track of a conductive target through the survey area.
It is in the interest of the Survey Planners to ensure that appropriate personnel attend one of the
Teledyne TSS training courses. Two levels of 350 training course are available. See
for a
description of each course.
4.1.2 Tone Frequency
Your choice of tone frequency that you inject onto the target cable should take account of several
factors, including:
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Specific requirements of the survey planning team.
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The length of the target cable. The distributed capacitance between the cable and sea water
attenuates high tone frequencies more rapidly than low tone frequencies. For this reason, sur-
veys on long cables might be easier to conduct if you select a frequency near the lower end of
the acceptable range. However, the 350 System is more sensitive to high frequencies than
low, and the System can therefore detect the cable at a greater range when you select a high
frequency tone.
❐
Noise in the survey area. High levels of background noise will reduce the ability of the 350 Sys-
tem to calculate the target co-ordinates accurately, particularly when the tone exists at a low
amplitude. Use the Scope and Spectrum Analyser window of DeepView to find a relatively
quiet part of the band and try to set a tone frequency within that region of the band.