R509/DIFFAMP/TZT3 - lost temp reading , how to debug?

B

backman

Furuno Fan
2 year old Airmar R509 connected to a TZT3-16 with a DI-FFAmp in between to boost the sonar to 3K.

I lost temperature on the last trip, getting —- in the SST field.

How do I go about figuring out which of the modules or wires is the problem? Is there a loop back tester for the R509? Can I bypass the DIFFamp and plug the 3K R509 into a TZT3?
 
Larry --
You should be able to measure the resistance across the temperature sensor wire and ground inside the DI-FFAMP box. Usually when they fail, they give a seriously incorrect reading rather than no reading at all. But I would start by measuring the resistance. I had one go bad. I called Airmar tech support and they told me the range of resistance values that I should see on my transducer, which varies with the temperature.

Is there any chance that the "Data Source" for SST accidentally got changed?

By the way, we have excellent tautog fishing nearby if that is of interest. Some are quite big, 19-22".
 
See the main forum, it appears after a bunch of debugging that I have one dead temp sensor, and one wildly inaccurate one. I spent some time this afternoon, isolating the issue. And I’m getting the - – – temperature with only one MFD powered on. I did verify data source also.
 
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