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Chapter: 6. Trouble Shooting
The red area. The Doppler frequencies and quality parameters:
Each channel has a set of parameters
1. The rst line shows the Doppler shift of the water track signal.The doppler frequency in kHz represent
the speed.. When the vessel is moving forward Channel 1 is forward looking and will normally be
positive. Channel 2 and 3 will normally be negative
2. The second line shows the Doppler shift of the bottom track signal. Available at depth <150m.
3. The third line shows the waiting time between ping and sampling for the water track, and is xed in
time. The gure after the ” / “ shows the length of the return signal before it fades. This gives an idea of
how much signal is reected from the water particles. If this is very low, the water is very clean or the
transmitted signal is weak.
4. The fourth line is as the third, however for the bottom track. The rst number will vary with depth, and
from these numbers you can get an idea of the slope of the bottom. It will also show if the bottom track
is triggering from something other than the bottom (for example a fresh water layer or sh). The gure
after the “ / “ shows the width of the bottom reection. This will typically be longer than the transmitted
ping and will get longer on sloping bottoms.
Possible Failures
When a failure occurs with the system, this screen allows the user to perform diagnostics. A failure in the
transceiver or sensor will be observable on this screen. Typically as follows:
1. Single channel failure: A single channel shows ”????” (question marks) in all frequency elds.
This can be a failure in the sensor head or in an individual channel on the transmitter. Check the scope (green
area) on the relevant channel.
Channel 1 = Fwd
Channel 3 = Starboard
Channel 4 = Port
If one channel is noisy, the sensor element is probably defective. To ensure the failure is the sensor and not
the transceiver, swap the transducer channels inside the transceiver cabinet on receiver connector J502. For
example if the suspected error is on channel 3, swap channel 1 and 3. Repeat this procedure on transmitter
connector J503. (See “270 kHz Sensor Cable Connection” on page 75 for details).
Note: Remember to turn o power at mains before attempting this!
The result of this will probably be that the “?????” (question marks) will move to the new channel. This
conrms that the fault is in the sensor or cable. If it does not move, the fault is within the transceiver cabinet
(either transmitter or power card).
Take 3-4 pictures of the screen with a few seconds interval and send by E-mail to manufacturer.
2. All channels “????” and below (question marks) in red area.
If all channels are ????, the fault is most likely the power supply to the sensor. Check all terminals on J502
and J503 are fastened securely and correctly. (See “270 kHz Sensor Cable Connection” on page 75 for
details.
If the temperature is also wrong (e.g. -4) the problem is most likely the sensor power supply. Measure the + -
9V power supply to the sensor (pins J502 p 20 - 21 and 23 - 21) with and without the sensor wires attached.
If the voltage drops considerably with the sensor power attached, the sensor is most likely faulty, although
the power card is also suspected. If the problem is not identied here, refer to further instructions available
as a data bulletin on the SKIPPER web site.
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