JRC JLN-900 - 1 Scope; 2 Equipment Needed; 3 Test Procedure for TRU

12-3
1Scope
This document describes the Harbour Acceptance Test (HAT) for JLN-900 Speed Log.
The HAT for JLN-900 Speed Log tests the Sig.Processor, the transducer (TRU), the
optional Sig.Distributor and their interaction.
The Sig.Processor contains a Water Track SAL WATER TRACK U unit (which
measures speed through the water) and a SAL T2 BTU Bottom Track PCB unit (which
measures speed over the ground). This document contains a list of equipment needed,
test procedures and a prepared test protocol.
2Equipment needed
In addition to the Sig.Processor, TRU, Sig.Distributor and Main display(s) under test,
the following equipment is needed:
x Calibrated DMM for measurement of VAC, VDC, ohm and frequency
x This HAT instruction, including an additional copy of the protocol pages.
x NMEA test equipment for monitoring the serial NMEA 0183 communication (such
as terminal-emulating PC).
x
i
i
11 for NMEA message description.
3 Test procedure for TRU
Refer to and note in protocol on page 12-8!
x Verify the serial number of the transducer.
x Verify that the transducer is correctly positioned and aligned according to the
installation manual.
x Measure the defined resistance values of the TRU and write down the result in the
protocol.
x Verify that the cable is of original length, has not been cut and is without any visual
damages and that the factory prepared termination ends are intact.
x Connect the TRU cable to Sig.ProcessorT2M-pcb terminals. Ensure that the red and
blue earth connections are connected to the ground screw (M5) on the Sig.Processor
chassis plate.
x Verify that the TRU cable outer screen braid is firmly connected in the EMC cable
gland at the bottom of the Sig.Processor cabinet.
x Verify that the Sig.Processor cabinet has a firm ground connection to ship’s hull
from the ground screw at the bottom of the Sig.Processor.