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Old 03-07-2008, 20:13   #1
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Testing a depth sounder on the hard?

Is there a simple way to test a depth sounder while the boat is on the hard. I picked up a like new Standard depth sounder head unit to replace my old one, and want to test it while the boat is on the hard.
Any suggestions?
Someone told me you should be able to hear the transducer clicking?
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Old 03-07-2008, 21:41   #2
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That's right

I know that the AIRMAR transdicers have a clicking noise. You have to get your ear right up to the transducer. Other than that I don't think there is.
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Old 03-07-2008, 21:41   #3
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Yes you should be able to hear it ticking or feel the pulse if it is powerful enough. Using a hard surface up very close to it will show you a depth and will vary as you change it slightly. The echo through air is very different in speed than that in water so this is not a calibration procedure but will indicate a change in depth as you move the plate a little. I have used this proving method on fairly strong sounders, don't know if a small low powered unit would have enough strenght to do this.
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Old 03-07-2008, 22:43   #4
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Because you can hear it ticking does not necessarily mean that it is working. There are a few other things that need to work in addition to its ability to make a sound pulse.
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Old 04-07-2008, 01:40   #5
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Correct!
Plus, NEVER put your ear up to it. The sound is way beyond your hearing range, but can still do damage close up. You can't hear anything apart from the click, but it sure can hurt.
It is not a good idea to run a transducer out of water. The powerful ones that have fishfinder ability, can actually crack the casing.
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Old 05-07-2008, 12:13   #6
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Hi! In the installation instructions of airmar you can find some hints about testing. I recommend strongly to reduce the transmission power of your system to minimum or use a testing tool for transducers because they are working with a low energy impulse. Furuno gives in its technical documentation some circuit layout for testing transducers, but you need a scope and I have to look for the document myself.
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Old 05-07-2008, 16:29   #7
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I don't need to test the transducer, just the head.
Maybe I'll cut an old trash can to the shape of the hull and set it on blocks so its is flush with the hull and tape it to the hiull, then fill it with water, for a quick test.

I bought the replacement one from a used equipment dealer, and have about 3 more weeks to return it if it doesn't work.

Thanks folks
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Old 05-07-2008, 19:55   #8
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If you do hold your head up to it, only do it for a few clicks. You lose 1 IQ per click.
A guy in our marina tried it for too long and ended up forgetting what he was doing!



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Correct!
Plus, NEVER put your ear up to it. The sound is way beyond your hearing range, but can still do damage close up. You can't hear anything apart from the click, but it sure can hurt.
It is not a good idea to run a transducer out of water. The powerful ones that have fishfinder ability, can actually crack the casing.
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Old 05-07-2008, 23:14   #9
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If you do hold your head up to it, only do it for a few clicks. You lose 1 IQ per click.
A guy in our marina tried it for too long and ended up forgetting what he was doing!
Did you need to take an aspirin after that event - Mr Sea-foxy-man?
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Old 06-07-2008, 00:49   #10
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A guy in our marina tried it for too long and ended up forgetting what he was doing!
Hmmm, wonder if I once got to close to my transducer???
Now, what was I do....oh yeah push this button
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Old 06-07-2008, 01:45   #11
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I heard it was good for removing wax in your ears. So what's a little forgetfulness, it has it's upside. Every story you hear become a new one. LOL
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Old 06-07-2008, 09:45   #12
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Maybe I'll cut an old trash can to the shape of the hull and set it on blocks so its is flush with the hull and tape it to the hiull, then fill it with water, for a quick test.
In my shop, I use a 10' length of pvc pipe with a cap on one end, standing straight up and filled with water. A B&G transducer, made by Airmar, works just fine sitting in the top of the pipe with the bottom resting on a cement floor. I have a tee with a screw cap on it near the bottom for draining if necessary. Iv'e never tried this on a boat on the hard, but don't see why it wouldn't work as long as you can get the water level up against the transducer.

Eric
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Old 06-07-2008, 10:48   #13
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Fairbank56, Thanks for that idea. I will try it. What diameter pvc pipe do you use? I think I hava length of 4 or 6 inch behind the barn.
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Old 06-07-2008, 13:50   #14
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I heard it was good for removing wax in your ears.
It's the removing by blowing it out the other ear that I am concerned with.
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Old 06-07-2008, 15:28   #15
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Just hold a radio on the am band next to it, you'll hear the ticking (if it's working).
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