5-19
Insulation Resistance Breakdown
Insulation breakdown is the most difficult fault to locate. Cable leakage is not necessarily located near the
end of terminations. However, the area near each termination receives the most abuse and is, therefore,
subject to suspicion. Successive cutting of the cable end until leakage disappears will prove successful in
many cases.
CAUTION!
Before cutting the cable for any of the above reasons, a careful visual
examination should be made for any signs of physical damage.
With both ends disconnected, the tow cables should measure between 100 Mega-ohms and infinity
between conductors with a 500 VDC Megohmmeter. When using a Simpson 260 Multi-meter, all cables
wire-to-wire or wire-to-shield should measure infinity. Any leakage on the multi-meter indicates cable
leakage.
Damaged Tow Cable Connector
The tow fish has a trip line that prevents the vehicle from hanging up on a snag. When the line trips, the
cable connection to the fish disconnects, exposing the high voltage pins to seawater. Pin corrosion will
start to occur as long as power is still applied. If the power is not immediately removed, and the cable is
not immediately retrieved, and the connector flushed out with fresh water, there may be permanent
damage to the connector. This will require cable re-termination.
5.7 Part Numbers for Major Topside Components
The major topside processor components and their part numbers are listed below:
NETBURNER MODULE, 0006191
POWER SUPPLY,24VDC, 0006372
ETHERNET WIRELESS BRIDGE, 0005089
ASSY, PCB, POWER BD, 0006040
Table 5-4: Part Numbers for Major Topside Processor Components
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