feedback
Enter marine-related query and AI bot will look for best match in our DB.
 

Our Doppler log is faulty, shows incorrect readings? How to check it and identify the faulty part of the system?

18 Aug '19, 03:52

Aug. 18, 2019, 3:52 a.m.
KnowledgeBase's gravatar image



Answer:

The most often cause of Doppler log failure is a transducer. To check it, identify the Signal Processor unit. The Transducer is connected to the Signal processor. You need to measure resistance between core and shields of 2 wires which come from the Transducer, see a drawing.

Resistance should be as below.

(fore beam)between 1 & 2 = 0 to 3 ohm
(Aft beam) between 5 & 6 = 0 to 3 ohm (thermistor)between 3 & 4 = 2.5 kohm at 25 deg C

Additionally, check the insulation resistance, between shield of each 3 wires and the hull. It should be above the 1 MOhm. Any deviations from above ranges will confirm the fault transducer. Get a new one and replace.

alt text

permanent link

18 Aug '19, 03:57

Aug. 18, 2019, 3:57 a.m.
cheng's gravatar image


add your answer

MarineProHelp 2018 - 2020

First time here? Check out the FAQ!

If you've arrived to new location and wonder how to dress comfortably according to weather, check Comfiesto

×