Anybody know, how to calibrate depth on Suunto ?

[jseyfert3]

I checked my manual a little further down. The Zoop (not the OPs computer, the OP can check his own manual) is rated to 1% of full scale accuracy from 0-80 m. 1% of full scale, or 80 m, is 0.8 m. So if the OP is at 20 m in freshwater it would read 19.4 m, minus the maximum accuracy range listed by Suunto and that gives 18.6 m, which means for that accuracy and diving in freshwater the OP's computer would actually be in spec...

 

[Storker]

3 % difference

Depth? Or pressure? The computer measures pressure, and the pressure difference is noticeably smaller than the depth difference at rec depths.

 

[Diver0001]

Hello,
I changed defective pressure sensor on my Suunto Cobra, it work fine now again, but in 20m Suunto shows only 18,8m . Anybody know, how to recalibrate it ?

Thanks

MilK

You can't.

In the worst cases you can send it to Suunto. If it's under warranty they may fix it. If it's outside warranty the costs of repair will be a problem. It's a very common problem with Suunto computers.

R..

 

[jseyfert3]

Depth? Or pressure? The computer measures pressure, and the pressure difference is noticeably smaller than the depth difference at rec depths.

The Suunto manual just says the readings will be about 3% smaller in freshwater.

You can't.

In the worst cases you can send it to Suunto. If it's under warranty they may fix it. If it's outside warranty the costs of repair will be a problem. It's a very common problem with Suunto computers.

R..

The OP did a DIY pressure sensor change, no way Suunto (or anyone else) will do a warranty or even non warranty repair now.

 

[BoltSnap]

The OP did a DIY pressure sensor change, no way Suunto (or anyone else) will do a warranty or even non warranty repair now.

Exactly, it would be a responsibility, reliability and liability mess for anyone to get involved with it now.

 

[mkotva]

English is not my native language, so if I expressed roughly, please excuse me ..
I only wanted to avoid a lengthy explanation of what I do not need to deal with. Sorry.

 

[Lorenzoid]

Isn't this a question to resolve BEFORE attempting to repair your own computer?

 

[KeithG]

You are good to go. In spec at the quoted depth.

Do not dive deeper until you have checked the new sensor at the computers full range...

 

[dmaziuk]

English is not my native language, so if I expressed roughly, please excuse me ..
I only wanted to avoid a lengthy explanation of what I do not need to deal with. Sorry.

I strongly doubt you can calibrate it, they just get the sensors with 1% accuracy from their supplier. So there is a tiny little fixed resistor with no markings that you're not gonna find, not gonna de-solder without frying something else, etfc. Most likely. If you know how to replace the sensor you probably know this too.

 

[RonR]

Depending on the sensor in the particular model (Intersema??) it is almost certainly carrying internal calibration constants inside the chip itself, from the sensor manufacturer. If so it's not possible to calibrate, only replace. If the sensor is outputting a digital signal, and most used in dive computers are, then all the computer's firmware is doing is converting that pressure to a depth value. These parts can be pretty fragile and easily damaged in assembly.

This is a small error, particularly if it's just an offset that is consistent with depth, but if it is 6% or so off at 50m then it may be more of a concern, though still not much of one. Based on experience I would be concerned that a damaged sensor can become increasingly unreliable, particularly after repeated dives. I'd just keep an eye on it and check it against other devices periodically.

Dive computers calculate based on pressure, not depth, so a depth reading could be off when compared to a measuring tape in different diving mediums- such as fresh or salt- but still be perfectly accurate re. decompression calculations.

Ron