
350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 6 of 10
10.Note which coil is being tested. This will be defined on the attached connector
cable, as outlined in Table E–1 below.
*To test the port or starboard fore/aft coils, the forward search must be used
11.On the Coil Tester press and hold the circular power switch. The battery condition
indicator LED should first show orange as the unit performs a self test and then,
approximately one second later, shows green. If the LED goes red or doesn’t illu-
minate at all, this indicates that the battery power is low. If necessary, follow the
instructions in Appendix E.4 to replace the battery.
12.While continuing to press the power switch, check the SDC screen and confirm
that the channel being tested shows a signal strength of 1.0 to 1.5e6. The digital
display at the bottom left hand corner of the Run Display screen should show a
value between 1e6 and 1.5e6.
13.Move to the Frequency Spectrum Display either from the Run Display screen or
from the Forward Search Display screen. You may use the Frequency Spectrum
display to examine raw signals received by the six search coil channels. The hori-
zontal axis of the display represents the frequency. The default view is 25Hz. It is
recommended that the frequency scale is raised to 50Hz to view the results. The
logarithmic vertical axis shows the absolute magnitude of signals at each fre-
quency within the displayed band. This screen will confirm that the tested channel
is receiving the tone at a frequency of 25Hz. After the results have been con-
firmed, toggle through the frequency range to return it to the default scale of 25Hz.
14.If the Run Display screen does not show the expected values, follow the guide-
lines included in Section E.5.
15.Repeat steps 4 to 12 for the remaining channels of the 350 System.
16.After completing the coil test procedure for all six channels, restore the 350 Sys-
tem to the original tone frequency for the survey. It is important to reset the pre-
Table E–2: 350 System Connector Cable Identification
Connector ID Description
SV Starboard Vertical
SL Starboard Lateral
PV Port Vertical
PL Port Lateral
SF Starboard Fore/Aft
PF Port Fore/Aft
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