Teledyne 440, System Manual, Page: 37 / 256

3 – Physical Installation
DPN 402196 Issue 4.1 © Teledyne TSS 3- 5
Figure 3-3: SEP and PSU mounting arrangement
3.1.3 Coil Array
NOTE
You should read this section before you attempt to install the array of search-coils.
These details are critical to the successful operation and performance of the 440
System. Follow these instructions carefully to obtain the best performance from
the System and to avoid interference with other equipment on board the ROV.
The Teledyne TSS 440 system has much more stringent requirements than its
predecessor in terms of the coils and their mounting arrangements. The seawater
signals can be almost completely excluded, therefore the performance of the sys-
tem is limited mainly by the stability of the background compensation values (see
section 6.2.2.3 "Background Compensation" on page 6-22).
The background compensation values must be absolutely stable and repeatable if
good quality survey information is to be obtained. The coils must be mounted a
sufficient distance from the ROV, and clamped tightly. Further, the metalwork of
the ROV must not interfere with the compensation levels. This means that any
manipulators must be tightly stowed during both survey and compensation.
NOTE
The coil cable assembly (P/N: 601004/x) can be provided in 3, 4, 6, 8 or 10m
lengths. The cable length is identified by the ‘x’ suffix, i.e. 601004/4 for the 4m
cable assembly. The following table outlines the cable part numbers and associ-
ated lengths.