A few months back when first used the unit in water, I noticed SST was -7 deg C. (should be about +20 deg C).
Temp sensor is part of the transducer (airmar 41-231-1-02, which I think is a B260) Brown & white wires to pins 4 &7.
In the Airmar schematic its described as a thermistor, so I assume its a PT100 which should be 100 ohms at 0 deg C. Am I right? (could be a PT1000)
I havnt checked resistance yet but will soon when back at boat.
Anyway I found the calibration menu and added approx. 20 deg C to it which brought it up to a more realistic figure. Since then I lost the temp altogether, and the bar graph range overlayed on the sounder screen I noticed is now unusable at about 30 to 50 deg.
Cant find in the menu where to change the displayed range. Can find C or F units and cal offset but how do I fix the displayed range?
Temp sensor is part of the transducer (airmar 41-231-1-02, which I think is a B260) Brown & white wires to pins 4 &7.
In the Airmar schematic its described as a thermistor, so I assume its a PT100 which should be 100 ohms at 0 deg C. Am I right? (could be a PT1000)
I havnt checked resistance yet but will soon when back at boat.
Anyway I found the calibration menu and added approx. 20 deg C to it which brought it up to a more realistic figure. Since then I lost the temp altogether, and the bar graph range overlayed on the sounder screen I noticed is now unusable at about 30 to 50 deg.
Cant find in the menu where to change the displayed range. Can find C or F units and cal offset but how do I fix the displayed range?