Rudder Angle Calibration. Maretron DSM250-01

Figure 145 – RAA100 Label Configuration

See section 3.3.4 for details on how to enter a textual value.

6.19.3 Rudder Angle Calibration

In order for the RAA100 to indicate an accurate rudder angle, it must know how the resistance of the resistive rudder angle sender corresponds to the rudder angle. The following screen will be displayed:

Figure 146 – RAA100 Rudder Angle Calibration Options

There are three methods of calibrating the rudder angle sender:

6.19.3.1 Custom Calibration

The Custom Calibration setting will provide the most accurate rudder angle readings under any circumstances, but it requires that you go through a process in which you set the rudder to full port, then center, and then full starboard, each time indicating the angle of the rudder to the DSM250. The

RAA100 will measure the sender resistance at each point and create a custom calibration map which relates the resistance of the sender with the rudder angle. Custom calibration is necessary for non-

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DSM250 User’s Manual standard values of resistances for rudder angle senders and for rudders with maximum port and starboard angles of anything other than 45°.

To perform custom calibration of the rudder angle sender, use the Scroll Up ( ) or Scroll Down (

) keys to move the highlighted cursor over the “Custom Calibration…” menu item. Then, press the

Enter key (

) to confirm your selection and begin the calibration process. Figure 147 shows the

DSM250 with the Custom Rudder Calibration menu item highlighted.

Figure 147 – RAA100 Custom Rudder Angle Calibration

The first step in the custom rudder angle sender calibration process is to turn the wheel hard over to starboard, and to measure the angle or the rudder (angle from center) with a protractor or other instrument. Use the Increase and Decrease keys until the highlighted rudder angle value is at the

measured value, and then press Enter to accept the value and store it within the RAA100. Figure 148

shows a screenshot of the starboard rudder calibration screen. You may also press the Abort Key (

) to end the calibration process.

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Figure 148 – RAA100 Starboard Rudder Angle Calibration

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The second step in the custom rudder angle sender calibration process is to turn the wheel so that the rudder is centered as much as possible. Next, press Enter to accept the value and store it within

the RAA100. Figure 149 shows a screenshot of the center rudder calibration screen. You may also

press the Abort Key ( ) to end the calibration process.

Figure 149 – RAA100 Center Rudder Angle Calibration

The third step in the custom rudder angle sender calibration process is to turn the wheel hard over to port, and to measure the angle or the rudder (angle from center) with a protractor or other instrument.

Use the Increase and Decrease keys until the highlighted rudder angle value is at the measured

value, and then press Enter to accept the value and store it within the RAA100. Figure 148 shows a

screenshot of the starboard rudder calibration screen. You may also press the Abort Key ( ) to end the calibration process.

Figure 150 – RAA100 Port Rudder Angle Calibration

Once you have accepted the port rudder angle value, a confirmation screen appears indicating that

the rudder angle calibration has been successfully completed. Figure 151 below shows a screenshot

of this confirmation screen.

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