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Chapter: 6. Trouble Shooting
Diagnostics
A diagnostic test is performed by by pressing ‘DIAGNOSTIC’ to “on”The test will take about 40 seconds.
The yellow highlighted section shows the results of the DIAGNOSTIC test. In addition, it will analyse the
inputs from other sensors. The results will be shown in the ‘test results’ frame, and advice based on the results
will be displayed in the ‘Possible reasons’ frame.
1: Signal level
The sensor will send particular acoustic signals out on all beams and check the level of water track received
is within specication. Level above 140 is good.
Too low signal may be caused by several reasons like:
“Missing +9 VOLT to the transducer”
“Missing -9 VOLT to the transducer”
“Damaged transducer element(s)”
“transducer cable is not connected”
“Bad connection of the transducer cable”
2: Sensor noise
The sensor will stop pinging and measure any noise created. A noise level below 24 is good.
This test is included in software version 4.04.01 to identyfy an oscillation noise that can happen on the
DL850 series manufactured before March 2017. (Serial # <17820)
The system will try to interpret the the diagnostics test result in section “Possible reasons”
Failing noise test
A sensor failing the noise test is probably defective and should be replaced.
If the noise test fails in one channel
only (on repeatable diagnostics
tests)it is possible to temporarily
disable the failing channel.
See Appendix 5 for procedure.
The DL850 speed log can work with
only 2 channels in operation.
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