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On 1 Dec 2017, at 20:39, Davide DB <<a href="mailto:dbdavide@gmail.com">dbdavide@gmail.com</a>> wrote:<br>
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<div dir="auto">Yes I know perfectly how calibration works. I meant how po2 is calculated from downloaded data.</div>
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<p style="margin-top:0;margin-bottom:0">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.
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<div dir="auto">It's a completely different story.</div>
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<div dir="auto">Am I the only one with a Petrel controller here? Maybe other user can confirm if their pO2 values are correct.</div>
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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.</div>
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<div><img size="0" contenttype="image/png" style="max-width: 99.9%;" id="img742866" crossorigin="anonymous" tabindex="0" src="cid:c2b9af0b-0980-493c-b296-7c51e8aff908"></div>
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<div>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.
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<div dir="auto">davide@mobile</div>
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<div class="gmail_quote">Il 01 dic 2017 7:38 PM, "John Smith" <<a href="mailto:noseygit@hotmail.com">noseygit@hotmail.com</a>> ha scritto:<br type="attribution">
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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?</div>
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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.
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