Suunto temperature error

[Bob DBF]

If the computer is inside of a rubber housing, on the wrist or on a console, it takes time for the water flow or tempature change to take place. On a wrist mount on my arm with a 7mm suit it takes quite a while for the temp to change, probably no water flow by the sensor, I can guess a lot faster than it can respond and give me a reading. The ones on an SPG are way faster.


Bob

 

[DuboisP]

Cheap micro controllers often come with a temperature sensor 'for free'. This saves some external circuitry and board space. Unfortunately they are a bit poor. Better than nothing though.

this temperature sensor is for the micro controller itself, for protection against overheat.

 

[KenGordon]

this temperature sensor is for the micro controller itself, for protection against overheat.

You are thinking about big processors like those found in a pc. Those use so much power they get hot. The micro controllers used in an embedded application like a dive computer have to get by with very little power and so virtually no heating, otherwise the battery life would be rather poor.

Here is an example

http://www.st.com/st-web-ui/static/...ical/document/application_note/DM00035957.pdf

 

[DuboisP]

You are thinking about big processors like those found in a pc. Those use so much power they get hot. The micro controllers used in an embedded application like a dive computer have to get by with very little power and so virtually no heating, otherwise the battery life would be rather poor.

Here is an example

http://www.st.com/st-web-ui/static/...ical/document/application_note/DM00035957.pdf

and on this one https://www.silabs.com/Support Documents/TechnicalDocs/EFM32GG395.pdf, it's a protection

you're right, i'm right

 

[Charles2]

Suunto computes with a deeper depth (pressure) than the displayed one (see manual)

Are you saying that Suunto somehow calculates NDL's using a deeper depth (pressure) than actual? Or, do they display a shallower depth than actual? Can you tell us where that is in the manual?

 

[Sevenrider860]

Are you saying that Suunto somehow calculates NDL's using a deeper depth (pressure) than actual? Or, do they display a shallower depth than actual? Can you tell us where that is in the manual?

I can't find where it states that a higher pressure reading is used for the internal calculations. Suunto does document that the oxygen calculations in the computer are made with an oxygen percentage of 1% + set O2%.

 

[Charles2]

Suunto computes with a deeper depth (pressure) than the displayed one (see manual)

Suunto does document that the oxygen calculations in the computer are made with an oxygen percentage of 1% + set O2%.

Does Suunto make any calculations based on correct information? -- You guys are scaring me! -- I'm going back to tables!

 

[KenGordon]

Suunto does document that the oxygen calculations in the computer are made with an oxygen percentage of 1% + set O2%.

If you tell the computer you have 32% that could be between 32.0 and 32.9. So it uses 33 for CNS and MOD calcs but 32 for deco calcs.

I expect all brands do this.

 

[Sevenrider860]

If you tell the computer you have 32% that could be between 32.0 and 32.9. So it uses 33 for CNS and MOD calcs but 32 for deco calcs.

I expect all brands do this.

Suunto is the only brand I have used that uses a higher O2 value for MOD and CNS (OLF on the Suunto) than what I actually input. It is fully documented in the user manual, so it is not a big deal once you know about it. It can cause some confusion during a Nitrox class when the tables have the MOD for 32% at 111 fsw and the student's Suunto is showing a MOD of 107 fsw.

I have yet to find any description where the Suunto uses a higher pressure for NDL calculations than the one displayed as was mentioned earlier in the thread.