On 1 Dec 2017, at 20:39, Davide DB <[email protected]<mailto:[email protected]>> wrote:
Yes I know perfectly how calibration works. I meant how po2 is calculated from downloaded data. Sorry, I wasn’t making myself clear. The point I was trying to make was wondering how libdivecomputer takes the individual cell calibration into account as there doesnt seem to be any calibration values in the log file. It's a completely different story. Am I the only one with a Petrel controller here? Maybe other user can confirm if their pO2 values are correct. I was thinking about whether I could time match data from my AP handset - which shows PPO2 for each cell against my ext petrel data. The following graph shows the data extracted from subsurface. [cid:c2b9af0b-0980-493c-b296-7c51e8aff908] I know there is a small difference between the two computers, I see that during calibration, but I cannot see anything major in this particular dive. davide@mobile Il 01 dic 2017 7:38 PM, "John Smith" <[email protected]<mailto:[email protected]>> ha scritto: What I do not understand is how this conversion was made the very first time. I mean how did you reverse engineered those values? I mean did you have a reference data set (mV, calibration K and resulting po2) to compare against? Surely every time you run the calibration routine on the shearwater there should be a new calibration value (calibration k) for each cell. The PPO2 is then a linear calculation based on this. _______________________________________________ subsurface mailing list [email protected]<mailto:[email protected]> http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
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