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2 – System Overview
DPN 402197 © TSS (International) Ltd Page 11 of 14
Important hardware and software differences exist between the Type 1 and the Type 2
SEP and these units are NOT interchangeable. You may identify the Type 2 SEP
described throughout this Manual by the ‘AUX OUTPUT’ port on one end-cap. The
Type 1 SEP does not include this port.
Contact TSS for advice if you wish to upgrade an existing Type 1 System to a Type 2
System so that you may use it within a Dualtrack installation. Refer to Appendix B for a
description of the Dualtrack System.
2.4.2 Sensing Coils
TSS supplies the coil triads already assembled and ready for you to install on the ROV.
Labels identify each triad as either the port or the starboard unit – you must install the
coil triads on their correct side of the ROV.
During a cable survey, the signals detected by the coils might fall to extremely low
levels (less than 5µV). To improve the overall signal-to-noise ratio received by the
SEP, each sensing coil has a low-noise pre-amplifier built into its connector assem-
bly.
CAUTION
TSS matches the coils and their pre-amplifiers carefully during manufacture. The indi-
vidual coils have no user-serviceable parts inside. DO NOT open the coils or remove
their connector assemblies for any reason.
During the manufacturing process, TSS calibrates each coil carefully with its associ-
ated pre-amplifier. The coils require no further calibration after manufacture.
The measurement process of the 350 Cable Survey System relies upon triangulation
using the coil separation distance and information derived from the received signals.
For this process to work accurately you must install and connect the coils correctly.
Refer to sub-section 3.2.2 for important instructions on how to construct the coil triads
and mount them on an ROV.
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