O2 sensor values on CCR dives

Anton Lundin glance at acc.umu.se
Mon Nov 27 08:27:00 PST 2017


On 27 November, 2017 - Davide DB wrote:

> On 17 November 2017 at 21:59, Davide DB <dbdavide at gmail.com> wrote:
> > On 17 November 2017 at 19:10, Anton Lundin <glance at acc.umu.se> wrote:
> >> On 17 November, 2017 - Davide DB wrote:
> >>
> >>> Looking to one of my CCR dives (Petrel 2 controller) I realized that
> >>> Po2 values reported by Subsurface at the 6 meter stop are way higher
> >>> than those recorded and displayed by Shearwater Desktop.
> >>> I'm 100 sure that Shearwater Desktop shows correct values because I
> >>> perfectly remember O2 values I was seeing at 6 meter: I was never
> >>> never never over 1.6 for all the time.
> >>> According to Subsurface profile I was all the time at 6m over 1.6 with
> >>> spikes at 1.75.
> >>> Am I missing something?
> >>>
> >>> I chose a point in time (122' 50")and I attach three screenshots:
> >>>
> >>> Shearwater (which display only the AVG pO2)
> >>> Subsurface with single pO2 sensor display
> >>> Subsurface with AVG pO2 sensor display
> >>
> >> Could you dump the raw data from the device?
> >>
> >> It can be done using either dctool or using the predator protocol and
> >> creating a device dump.
> >>
> >>
> >> You could probably just send a log file of the download, I think I still
> >> got the tool to replay a log file as a download.
> >>
> >>
> >> Then I can take a look at the raw data to try to figure out what's going
> >> on.
> >>
> >>
> >> //Anton
> >
> >
> > After depleting one battery here are.
> >
> > Dctool is a lucky process. 99% of the times I get errors like this:
> >
> > [73.192176] ERROR: Failed to receive the response packet. [in
> > ../../source/src/shearwater_common.c:319 (shearwater_common_transfer)]
> > [73.192715] ERROR: Failed to download the dive. [in
> > ../../source/src/shearwater_petrel.c:266
> > (shearwater_petrel_device_foreach)]
> > [73.193107] ERROR: Error downloading the dives. [in
> > ../../source/examples/dctool_download.c:218 (download)]
> > [73.193712] INFO: Write: size=9, data=FF0105002E902000C0
> >
> > Raw file for the dive attached
> >
> > Thanks a lot
> >
> > --
> > Davide
> > https://vimeo.com/bocio/videos
> 
> Hi Anton,
> Did you find the time to have a look at it?
> 
> Thank you in advance

I haven't gotten around to it. Jef might be interested in looking at it
to, so I'll ping him.


//Anton


-- 
Anton Lundin	+46702-161604


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