Maretron M001101 Manuale Utente

 

terminal are between 100 and 400 ohms, however, some gauges have very high resistance 
(i.e., greater than 3000 ohms). A resistance value over 3000 ohms generally indicates a low 
cost, low accuracy gauge (i.e., gauge reading changes with battery voltage even though the 
rudder angle is not changing). If the resistance measurement is above 3000 ohms, don’t worry 
about recording the exact reading, as the maximum programmable value in the RAA100 is 
3000 ohms. Maretron recommends that you custom calibrate (see Section 3.3.2) your system 
whenever you are using a gauge with a reading of 3000 ohms or more. Also, you must be 
aware that these inexpensive gauges won’t necessarily agree with the digital data available on 
the NMEA 2000

®

 network as the gauges tend to be inaccurate. 

 
 

The RAA100 is capable of accepting standard resistive values with maximum port and 
starboard rudder angles of 45° (see Section 3.3.1) or it can be calibrated for any resistance 
range between 0 and 300 or 300 and 0 ohms or other values of maximum rudder angle using 
the custom calibration procedure (see Section 3.3.2).  
 

The RAA100 can be used with standard resistive rudder angle senders such as the American 
Standard (240-30 ohms) or the European Standard (10-180 ohms). This can be a one-step 
calibration assuming that the maximum port and starboard rudder angles are 45°. You can 
select which type of sender is attached to the RAA100 using a display product such as the 
Maretron DSM200. Refer to the user’s manual for configuring the RAA100 as the manual 
provides detailed instruction on configuration procedures. 
 

The RAA100 can be custom calibrated for one of several reasons: 
 

1.  A non-standard rudder angle sender is being used, 
2.  The maximum rudder angle (port or starboard) is other than 45°. 

 
Regardless of the reason for custom calibrating the RAA100, you can calibrate the RAA100 
using a display product such as the Maretron DSM200. Refer to the user’s manual of the 
particular product that will be used for configuring the RAA100 as these manuals provide 
detailed instruction on configuration procedures. 
 

Regular maintenance is not required, however, an occasional inspection will ensure continued 
proper operation of the Maretron RAA100. Perform the following tasks periodically: 

 

•  Ensure that the unit is mounted securely and cannot be moved relative to the mounting 

surface.  If the unit is loose, tighten the screws holding the cable ties. 

•  Check the security of the cables connected to the NMEA 2000

®

 interface and the 

connections to the gauge or sender and tighten if necessary.