Testing the receiver channels with the BITE Matrix page
The Matrix page allows you to monitor the average signal values or signal phases from each of the channels and transducer elements in the MS70. The presentation is provided on a matrix corresponding to the element locations in the transducer. For receiver testing, the MS70 must be operational, and both operational and BITE parameters must be known.
Prerequisites
The MS70 is switched on and working in normal operational mode. Neither tools nor instruments are required.
Context
When you move the cursor over the matrix presentation of the MS70 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.
The following requirements must be met:
•  The information presented by the Matrix page verifies that the MS70 is fully operational.
Note
This test must be considered as indicative. With the vessel in port, the environmental conditions are not satisfactory. In the shallow waters of the port, noise from other vessels, dockyard workers or machinery will cause unreliable test results. The test is therefore repeated during the Sea Acceptance Test.
A rectangle with 32 black elements in the matrix view indicates a failure with a single transceiver board. The tool-tip will indicate which board that fails. Restarting the system will normally fix the problem. Failure of eight or nine consecutive transceiver boards indicate a problem with the power supply.
•  Weak signals indicate problems with the +6 VDC supply voltage for the analogue amplifiers.
•  No response indicate a problem with the +12 VDC supply voltage used for the digital circuitry.
•  A failure in the +75 VDC supply voltage can only be detected in the transmit test.
Procedure
1 On the Main menu, set Beam Mode to Example 1 Sector Uniform Weighting.
2 Select the Operation icon.
The icon is located under the Main menu. It is used to open the Operation menu. Choose these settings:
a Set Operation to Normal.
b Set Range to: 100 m.
c Set Ping to On.
d Set Ping Mode to Interval.
e Set Ping Interval to 1 s.
f Set TX Mode to Passive
g Set TX Power to Maximum.
3 Start the BITE (Built-In Test Equipment) utility.
4 Select the Matrix tab to open the page.
5 Choose these settings:
a Select Element amplitude.
b Set Start Averaging to 5000.
c Set Averaging Range to 200.
d Set Scale to Automatic.
e Set Element size in pixel to Height 24 pixels and Width 12 pixels.
f Set Transmit pulse to Current.
6 Observe the average of the samples starting from sample 5000.
These samples are all inside the receive period of the ping.
7 Locate any elements that exceeds the requirement for difference between neighbouring elements.
8 Evaluate the level for the functional elements by pointing at each element and read the level from the tool tip. Check for neighbouring elements with the maximum deviation.
Result
If single elements, or groups of elements, report signal levels with abnormal deviation from it's neighboring elements, this indicates malfunctioning receiver hardware. If the transmit test for the elements in question works well this indicates a bad cable connection to the transducer.
Possible reasons may be:
•  Bent or broken pins between the transceiver backplane and the transceiver board or transceiver interface board for the relevant element.
•  Bent or broken pins in the cable connector into the transceiver interface board for the relevant element
•  Damaged cable
•  A defective transducer element.
Test procedure Results
Testing the receiver channels with the BITE Matrix page  
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