Banner DF-G1-PR-Q7 Instruções de Operação Página 221

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350 Cable Survey System
DPN 402197 © TSS (International) Ltd Page 4 of 18
D.2.4 Maintenance
The altimeter should be immersed in fresh water if it is not to be used in the next cou-
ple of days then placed in a dry environment. Inspect the transducer face and clean
with a mild detergent if the transducer face is not clean. It is important to ensure the
transducer face is clean to ensure maximum efficiency of acoustic energy into seawa-
ter. Ensure no silicone grease from the connector is allowed to come into contact with
the transducer face.
D.2.5 Test in Air
The altimeter should first be tested in air to ensure its correct operation. This can be
done by connecting the unit to +24VDC, or 8-24VDC if switch mode operation is
selected, and reading the serial output data with a PC terminal emulation program
such as Hyper Terminal.
The range data output should read R99.99E when the unit is in air whilst temperature,
(Txx.x), should read air temperature. The altimeter should emit a “ticking” sound at a
rate of 5 per second thus confirming the transmitter is working and that the power
supply is sufficient to power the altimeter. If the voltage is too low to power the altime-
ter the serial data will still output data but there will be no ticking sound.
The high frequency used for the altimeter is greatly attenuated in air therefore the sig-
nal is not able to travel more than approximately 1 metre, (indicated) in air, although
the signal can be seen on an oscilloscope at TP7. The pre-deployment check should
consist of rubbing the transducer face when the range serial output should change
from 99.99 to an erratically changing value.
D.2.6 Internal Settings
Ensure the internal switch is in the correct position: this should already be set for
2400 baud for use with the TSS 440 and 350.
If the internal switch needs changing, make sure the housing is clean and free from
debris before unscrewing the captive retaining ring ensuring water or debris does not
enter the pressure housing when the transducer and electronics are separated.
As the electronics board is lifted from the housing make sure the interconnecting
cable is free and is not caught on components causing strain on the connector and
wires.
Table D–3: Switch S1 settings
1 Internal input select
On: TTL input, Off: RS-232 level input
2 Internal/ external trigger
On: External, Off: Internal (default)
3 Baud rate select
On: 9600, Off: 2400 (default)
4 Step-up power supply disable
On: 17-24V input, Off: 8-24V input (default)
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