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rchambers wrote: snip >...it shows on the software that the change over to the next gas was >completed at 30' not at the actual depth of 60' that it was done at. >I'm, hoping that this is a software glitch and not a problem with the >computer. snip After futilely searching our databases for "rchambers" (or anything similar) we finally connected with Robert Chambers in Barbados via Email and later by phone. He wasn't in any of our computer systems because we did not have his warranty card, and did not know the serial number of his unit to back-track it. Robert was cooperative and apparently is quite an accomplished diver. As background information, the NEMESIS II Nitrox will perform a blend switch (patent pending) if the Breathing Parameter (SAC) goes to zero. Since the computer does not actually "know" when a switch occurs, it monitors the primary cylinder and assumes the diver has switched to blend two when it is detected that breathing has stopped on that cylinder. The unit will switch back to the primary cylinder if breathing is detected again and if the "switchback function" was enabled by the user. The user can also select the responsiveness of the switch. One of eight different response speeds from very slow to highly responsive can be selected. We reviewed Robert's ANALYST files he kindly sent to us and identified the reported blend switch. As recorded by the dive computer, the dive at issue was number 46 on February 13, 1996 at 11:27 PM in 81F seawater. The responsiveness of the Breathing Parameter on that dive was set to a relatively slow factor of 6 on a scale of 0 to 7 where 7 is the slowest. Maximum depth of the dive was 184 feet with an average depth of 89 feet for a total dive time of 28:39. The diver started ascending at 9:33 into the dive, and was ascending at varying rates less than 50 feet per minute at the time that breathing stopped from the primary cylinder at 16:38 into the dive at 51 feet of depth. The dive computer switched to the second blend at 17:10 into the dive at 34 feet of depth as the diver was continuing to ascend. The bottom line is that the dive computer's switch to the second blend was within 32 seconds as the unit ascended another 17 feet. The dive computer functioned as expected and the dive was not compromised. The blend switch could have occurred sooner if the setting for the Breathing Parameter responsiveness had been smaller (faster response). Robert says (unsolicited) "Loves our computer...", it "...has changed my diving...for the better.", and "No one else's computer is worthy of consideration." Mike C. On Sun, 25 Feb 1996 rchambers@su*.ne* wrote: > I had to return my unit because it was out of calibration. Since I have been > using the new one that was returned to me, it shows on the software that the > change over to the next gas was completed at 30' not at the actual depth of 60' > that it was done at. I'm hoping that this is a software glitch and not a > problem with the computer. I was coming up from 185' for 20 mins.(I'm carring > my hard tables with me just in case.) > > Regards > Robert Chambers > Barbados > West Indies. > > On Sat, 29 Oct 1994, Teresa Telus <teresa.telus@mo*.co*> wrote: > >My Nemesis Nitrox 11 wrist unit has been stuck on its test page three times > >now, once before a dive and twice after. The only way to clear the screen > >was to remove and replace the batteries in the wrist unit, the batteries > >were not old, then it worked as advertised. > >Also I have heard through the grapevine of a Nemesis performing an > >uncommanded gas switch at 40m. Has anyone else had any of these problems. > >Please let me know. > > > > > > > > > > > >-- > >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > >Send subscription/archive requests to `techdiver-request@terra.net'. > > > > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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