littmann cardio III

[jcms]

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I've just bought Littmann Cardio III and I wonder if it's normal that I can hear some kind of crack when I use small side and change (pressure) from diaphragm to bell mode.

 

[keeping-it-real]

I've just bought Littmann Cardio III and I wonder if it's normal that I can hear some kind of crack when I use small side and change (pressure) from diaphragm to bell mode.

yes. there is a small bearing that closes off the "unused" portion, and this is what you hear. if you put it on the diaphragm mode, look at the bell and you might be able to see the bearing i am talking about.

 

[jcms]

Sorry my description wasn't very precise - I meant I can hear some crack/click when I change pressure on the chestpiece from high to low (from diaphragm to bell mode and only when I use small diaphragm) but not while changing side of the chestpeice.

 

[keeping-it-real]

Sorry my description wasn't very precise - I meant I can hear some crack/click when I change pressure on the chestpiece from high to low (from diaphragm to bell mode and only when I use small diaphragm) but not while changing side of the chestpeice.

ah, i think i see what you're saying. in that case, though, i can't answer your question. i don't have the small diaphragm on, i just keep it as a bell.

 

[Bad-Obsession]

I have the same steth. Remember when you have it on bell mode you should just lay the bell on the surface you are listening to without adding any pressure to the bell. If you apply pressure you may hear the crackling because it is trying to act as a diaphram. Good times.👍

 

[Random]

But if JCMS is using the bell side as a tunable diaphragm, that click may be the PVC on the diaphragm ring that will sometimes stick to the metal attenuating ring when you go from high to low frequency. Not sure how to fix that; I don't think it alters the function any.

 

[jcms]

But if JCMS is using the bell side as a tunable diaphragm, that click may be the PVC on the diaphragm ring that will sometimes stick to the metal attenuating ring when you go from high to low frequency. Not sure how to fix that; I don't think it alters the function any.

Yes - it looks like the diaphragm sticks to the metal ring. Any idea how to fix it?Maybe a drop of the oil on the ring will help?

 

[jcms]

In addition to this in my steth the quality of high tones of the pediatric side (in diaphragm mode=high pressure) is quite poor compared to adult side - is it normal in the Cardio III or something's wrong with mine?Pediatric side in bell works good.

 

[Random]

My impression is that some talc would at least help with the "clicking"; that's what they do when they install the diaphragms at 3M. As for the high frequency problems with the peds side, there are two things to remember: first, it's smaller so it'll naturally have lower amplitude and second, it's much more important to be sure that you're really pushing down on the diaphragm to be sure that you have a good seal against the metal ring.

 

[jcms]

My impression is that some talc would at least help with the "clicking"; that's what they do when they install the diaphragms at 3M. As for the high frequency problems with the peds side, there are two things to remember: first, it's smaller so it'll naturally have lower amplitude and second, it's much more important to be sure that you're really pushing down on the diaphragm to be sure that you have a good seal against the metal ring.

Thank you very much!!Talc fixed my steth.