Prerequisites
The ME70 system is installed as specified in the Installation Manual.
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The ME70 system is turned on and operates normally. |
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The vessel is berthed or at sea. |
CautionYou must never set the ME70 system to "ping" unless the transducer is submerged in water. The transducer may be damaged if it transmits in open air.
Context
When you move the cursor over the matrix presentation of the transceiver channels, each element in the transducer can be clearly
identified as a rectangle. If you place the cursor on top of one of these rectangles, a small yellow tool-tip will identify key information.
A rectangle with 32 black elements in the matrix view indicates a failure with a single transceiver board. Restarting the ME70 system will normally fix the problem. Failure of eight or nine consecutive transceiver boards indicates a problem with the power supply.
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Weak signals indicate a problem with the +6 VDC supply voltage to the analogue amplifiers. |
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No response indicate a problem with the +12 VDC supply voltage to the digital circuitry. |
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A failure in the +75 VDC supply voltage can only be detected in the transmit test. |
Procedure
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1 |
On the Main menu, set Beam Mode to Test - SAT Config. |
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2 |
Open the Operation menu.
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a |
Set Operation to Normal. |
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d |
Set Ping Mode to Interval. |
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e |
Set Ping Interval to 1 s. |
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Set Tx Power to Maximum. |
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3 |
Open the BITE Matrix page.
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b |
Select BITE to open the dialog box.
Observe that the BITE (Built In Test Equipment) dialog box opens.
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c |
Open the BITE Matrix page. |
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4 |
Choose these settings:
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a |
Select Element amplitude. |
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b |
Set Start Averaging to 20. |
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c |
Set Averaging Range to 100. |
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d |
Set Scale to Automatic. |
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e |
Set Element size in pixel to Height 24 pixels and Width 12 pixels. |
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Set Transmit pulse to Current. |
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5 |
Observe the average of the samples starting from sample 20. |
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In the event of unserviceable elements:
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Set Minimum value to 35. |
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Set Maximum value to 45. |
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d |
Evaluate the level for the functional elements with the maximum deviation. |
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Result
This test shows the weighting used during transmission of a normal beam. In order to test all transmitters with equal level,
select beam mode Example 1 Beam Uniform Weighting, and run the transmitter test one more time.
These samples are all inside the transmit pulse and the weighting of the elements during transmission will be visible.
If a single element, or a group of elements (transceiver boards), reports signal levels with abnormal deviation from it's
neighboring elements, you may have a failure. If the receiver test of the relevant elements performs well, you probably have
malfunctioning transmitter electronics.
NoteThe combination of Uniform weighting and automatic scaling makes the BITE view use the full colour scale on a relative small
difference between elements. This will not “look good” even for a fully functional transducer. You must look in the numerical
data for large difference between neighboring elements, and notice any differences between the strongest and weakest element.