Verifying CS90 operation by means of the Element BITE functionality
The purpose of the Element BITE (Element Built-In Test Equipment) dialog box is to allow on-line test and verification of the individual elements in the transducer. It allows you to see if the transducer elements are operational during transmission and reception. The B-Scan page allows you to monitor the time series of data that is received from each of the elements in the CS90 transducer. The start sample and the number of samples to be displayed are adjustable.
Prerequisites
The CS90 is installed as specified in this manual.
•  The CS90 is turned on, and it is working normally.
•  The CS90 is in Normal mode, but TX Power is set to Off to prevent transmission.
•  The transducer is retracted to its upper position.
•  The vessel is berthed or at sea.
Neither tools nor instruments are required.
Caution
You must never set the CS90 to "ping" unless the transducer is submerged in water. The transducer may be damaged if it transmits in open air.
Context
By means of the Element BITE (Element Built-In Test Equipment) functionality, you can easily determine if the CS90 hardware is operational. The following pages are provided.
•  Matrix
The Matrix page allows you to monitor the average signal values or signal phases from each of the channels and transducer elements in the CS90. The presentation is provided on a matrix corresponding to the element locations in the transducer.
•  B-Scan
The B-Scan page allows you to monitor the time series of data that is received from each of the elements in the CS90 transducer. The start sample and the number of samples to be displayed are adjustable.
When you move the cursor over the B-Scan presentation of the CS90 transceiver channels, each element in the transducer is clearly identified as a long coloured vertical rectangle. If you place the cursor on top of one of these B-Scan rectangles, a small yellow tool-tip will identify key information.
–  The identification of the transducer element
–  The identification of the transceiver board
–  The current sample you are looking at
–  The measured echo value (in dB)
Procedure
1 Make sure that you have sufficient water depth below the keel before you lower the transducer.
2 Lower the transducer to its bottom position.
3 Select the default settings.
a On the Main menu, select User Settings.
b Observe the Factory Settings list.
c Select the setting you wish to use.
d Select Activate Selected Setting.
e Select OK to apply your changes and close the User Settings dialog box.
4 Make the following preparations.
a On the Main menu:
•  Set Range to 1500 m.
b Open the Operation menu.
•  Set TX Power to Off.
c Open the Active menu.
1 Set Pulse Type to CW Medium.
2 Set Frequency to 70 kHz.
3 Set Vertical TX Sector to Narrow.
4 Set Noise Filter to Off.
5 Set the Bottom Filter Threshold to Off.
d Open the Setup menu.
•  Select BITE to open the BITE (Built-In Test Equipment) dialog box.
5 Select Processor to open the page.
6 Open the Element BITE (Element Built-In Test Equipment) dialog box.
a Select Element BITE to open the dialog box.
b Select the B-Scan tab to open the page.
c Select Element amplitude.
7 Test the receiver performance.
a Set Start sample to 5000.
b Set Sample range to 10000.
c Look at the pattern in the B-Scan presentation, and compare them with the example provided.
Image

This screen capture shows the B-Scan pattern while testing the receiver in the near range.
To detect unserviceable transducer elements and/or transceiver boards, you must compare the rectangles. When operating the CS90 in port, the colours will be less homogeneous due to the environmental noise and the shallow depth. During normal operation at sea the colours will be homogeneous.
•  If a single element is "dead" (no transmit, no receive), the rectangle is easily spotted because its colour is black.
•  If a single element is receiving, but not transmitting, the rectangle is normally presented in lighter shades of blue.
•  If a transceiver board is "dead" (no transmit, no receive), all the transducer elements connected to the board are easily spotted because they are all black.
8 Test the transmitter performance.
a Set Tx Power to Maximum.
b Set Start sample to 50
c Set Sample range to 2000
d Look at the pattern in the B-Scan presentation, and compare them with the example provided.
Image

This screen capture shows the B-Scan pattern while testing the transmitter. You can clearly see the transmit pulse.
9 Check for any weak elements in the transmission sample range.
If any weak elements are detected, record these in the result table.
10 Check for any black lines in the transmission and reception sample ranges.
A black line would indicate an unserviceable element. If any such elements are detected, record these in the result table.
11 Finish the test.
a Close the Element BITE (Element Built-In Test Equipment) dialog box.
b Close the BITE (Built In Test Equipment) dialog box.
c Set TX Power to Off.
d Set Operation to Inactive.
e Hoist the transducer back up to its upper position.
Result
Requirements Results
The information presented by the B-Scan page verifies that the CS90 is fully operational.  
All elements are operational in both transmit and receive. The maximum number of unserviceable elements is 5.  
Weak elements:
Unserviceable elements:
Date and signature: