Intermittent Vision Issue

AM

Like the title says, for some time I've had an on/off fault on the Vision elecs, mainly consisting of "missing C1+2" NO DIVE lockout appears and when I do get through successful calibration I get battery power display flickering between 1, 2 and 3 bars of power.

Anyone else had similar?

scubanimal

AM,
Not sure where you are, but have you contacted AP or silentdiving? I had an issue, contacted them, sent the log and had a diagnosis the next morning that worked.

PCDiver

I had something similar with corrosion on one of the springs in the battery compartement. I now use contact fluid on the springs and that seems to help.

rewrites

Not had this particular problem, but have had EVERY software problem associated with the unit to date. You could try bridging the battery springs with a spanner or similar. This in effect acts as a temporary reboot IIRC (saw it done at the factory when my unit had the CNS and Max Deco display problem). See if this makes any difference. It is a temporary measure however.

For what it's worth, mine went back to AP a few weeks back as the unit failed to start at the beginning of a dive (grey bars above each button and alarm buzzing but no display). I bridged the battery springs with a spanner after seeing AP do it and managed to complete the dive with full display.

AP sent it back to their electronics people. Basically, there is another software fault whereby both controllers are not shutting down completely when the 'POWER OFF - ALL' button is pressed - only one controller shuts down. The other still works in the background - can explain if you are experiencing lower than typical battery life! Temporary answer is to shut down each controller individually.

There is supposed to be a bug fix software update soon - that was 3-4 weeks ago.

Sorry to hijack your thread, AM Hope it helps.

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AD_ward9

Your report of this on the Inspo forum and particularly the interesting response you got from "the factory" caused some discussions among safety experts between different companies, as we were all led to believe that the Vision had full redundancy (albeit, two of the same thing).

The response you got shows it is not really dual redundant, and that some faults like the scrubber stick wiring, will cause both processors to be upset at the same time.

From the "rewrites" post, it sounds like some memory transfers have correct timing, or there are yet more software issues.

I will not mention need for the industry to adopt the minimum safety requirement beginning with EN6.. that would certainly prevent things like this happening, but until that happens I do have a fix: fit Brent's head upgrade and a KISS PPO2 monitor. It should be at least a step forward.

Alex

Mdemon

To echo what was said above, I'd be looking at independant monitoring for this unit as a backup, be it VR£, Beanie holder/rEvoDream or go the whole hog and get a Deep Pursuit.

Would change the situation to one of mild annoyance should the thing fail in-water.

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divetheworld

As our HUD is completely independant in every way except the cells, using another handset (which we will offer at minimum cost) would give true triple redundancy and make steps towards the benchmark that Alex advocates.
Although we make no claims that our system meets compliance with that particular standard, we do beleive that all manufacturers should work towards making their electronics safer. True redundancy in one form or another should be a cornerstone of the design of any life support system where the failure of which could lead to catestrophic results. That backup should also be of the highest reliability. Where that reliability cannot be assured, we believe multiple fault tolerance should be considered.

Consumers should demand these steps are taken as market forces seem to be the guiding principle.

If it smells like fish.......................

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AM

Thanks very much for the replies on this and the PMs, I just haven't yet had a chance to reply until now. No problem about hijacking the thread, the more information we share about these erroneous electronics issues, the better for all users. Information dissemination is never a bad thing.

Alex - I concur entirely with all your points. I must admit I am somewhat surprised to find that the Temp-Stik (if the wiring is damaged) can potentiate a complete failure of C1 and C2. The benefit ratio of having the Temp-Stik does not, to my mind, justify the risk which damaging it presents to the handsets. Intermittent faults like this (if wiring related) could easily result in a full loss of handset PPO2 monitoring. I am currently obtaining further information on this and will report back my findings when I get a chance.

Thanks again for the replies. My perceptions of many rebreathers on the market all point to the same fundamental issues:

• Lack of adherence to correct EN protocols.
• Fundamental lack of insight into the end to end Technical Testing lifecycle.
• Inherent hardware design problems, resulting in serious single points of failure.
• Erroneous software coding.
• Functional testing should be revealing software bugs in the TEST lifecycle NOT live production/aftersale.
• Acceptance criteria badly defined for when rebreather can go to market.

Regards

AnneMarie

jepuskar

Any more info on this? Has this been reported to AP?

J

anton610

Are there more infos??

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