Teledyne 440, Системное руководство, Страница: 106 / 256

6 – Operating Procedure
6-2 © Teledyne TSS DPN 402196 Issue 4.1
4. Establish the scope of survey data acquisition, for example the maximum vertical range,
required accuracy of data, etc. You may be able to use the examples in
Chapter 8 "System
Specifications" or you may test a sample of the target on dry land.
5. Determine the maximum tolerance limits of roll, pitch and skew between the ROV and the tar-
get during the survey.
Data Collection
6. Define the type of data you will need to collect during the survey.
System Installation Requirements
7. Determine whether the ROV will be suitable for all the survey requirements.
8. Decide which communications method to use from among 2-wire current-loop, 4-wire current-
loop, or RS232.
9. Decide whether to use an altimeter or a rapid update profiler. Determine which type of altimeter
you will use and where you will install it. Contact Teledyne TSS for advice if necessary.
10. Determine what facilities will be available for logging the survey data.
11. Provide a printer for connection to the SDC.
12. Determine the requirements for maintaining a video record of the survey.
6.1.1 Training and Availability
When used properly, the Teledyne TSS 440 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.
NOTE
It is in the interest of the Survey Planners to ensure that appropriate personnel
attend one of the Teledyne TSS Training Courses.
See Appendix B.2 "Training" for a description of the training available for the Teledyne TSS 440 Pipe
and Cable Survey System.
Ensure that a 440 System in good working order will be available at the time of the survey operation.
6.1.2 Target Scaling
The 440 System features a simple and quick method to set the target scaling factor automatically for a
particular target type and size. To achieve this, the System includes a comprehensive database of
information acquired for a very wide range of target type and size.
Use the auto-scaling procedure to select the target diameter. After you have done this, the System
refers to its database of target characteristics and selects a value appropriate for the survey.
The range and accuracy of measurements available from the 440 System varies with the type of target
and its size. This Manual cannot therefore include precise specifications to cover all possible targets.
However,
Chapter 8 "System Specifications" includes a series of tables that show the degree of