ResMed AirSense 10 Time as shown in OSCAR

[pholynyk]

In the seven-plus years I've had my AS10 I've never unplugged the power before removing or inserting the SD card.

Of course, I wait until after my coffee before looking at OSCAR, and I don't do anything around 10 past machine noon while it updates the STR.edf file.

If you leave it plugged in and on standby, that little battery will last longer.

[SnoringInOregon]

I will elaborate on what others have already said, and add my own comments:

1) You're overthinking the SD card stuff. What you're doing isn't adding value. No need to turn the entire machine on and off just to remove a card, just do it at a "safe" time. E.g. user pholynyk mentions that SD updates occur at about 12:10 PM (in addition of course to ongoing updates while the machine is active, until shortly after you stop the airflow).

If you're turning the machine off to avoid SD corruption, then I claim that such corruption is probably just as likely in either of these situations:

1a) machine is powered-off at the wrong moment, while an SD update in progress

1b) machine remains powered-on, but an SD card is ejected at the wrong moment, while an SD update in progress

Just try to avoid ejecting the SD card at the improper time.

2) I don't think it's a problem to insert an SD card while the machine is powered up. It cleanly detects this occurrence and cautions you to leave things alone while the machine scans the SD card.

3) my old Dreamstation was very good about gaps between sessions recorded to SD card. Perhaps a second or two lost at noon. I just got a AS11 and it's pathetic. The last time I did an overnight shift and slept through noon, here's what happened: detailed recording stopped at 11:59:13 AM and didn't resume until 12:00:08 PM. However, my AS11 doesn't always delay until 12:00:08. But I also saw a recent gap where recording was resumed at 12:00:04.

4) I've only had my AS11 for a few days but it seems to know the correct time. That's probably because they use the built-in cellular modem to get time from an NTP server on the Internet. (the cellular modem always knows the correct time but it might not be possible for the AS11 software to obtain that value). My Dreamstation remained accurate to about 1 second for an entire 5 years. Either it had an atomic clock in it (most unlikely) or it just asked an external server for the time using its cellular modem.

I will know more about how my AS11 behaves after I've had it for a month or two. But perhaps your concern about its time handling is premature. It might just keep exact time, as long as you get one with a built-in cellular modem (and your insurance pays the monthly fee for cellular service).

[Dog Slobber]

4) I've only had my AS11 for a few days but it seems to know the correct time. That's probably because they use the built-in cellular modem to get time from an NTP server on the Internet. (the cellular modem always knows the correct time but it might not be possible for the AS11 software to obtain that value). My Dreamstation remained accurate to about 1 second for an entire 5 years. Either it had an atomic clock in it (most unlikely) or it just asked an external server for the time using its cellular modem.

I will know more about how my AS11 behaves after I've had it for a month or two. But perhaps your concern about its time handling is premature. It might just keep exact time, as long as you get one with a built-in cellular modem (and your insurance pays the monthly fee for cellular service).

The AirSense 10's had cellular modems, but never synced to NTP servers. To date, many Air11 users (with connectivity)  have posted about incorrect times, and no ability to change time. This suggests no time-syncing is occurring.

There is no cellular service fee charged or passed on to the end-user, insurance carrier or DME for cellular service. the M2M data charges are completely absorbed by ResMed in there carrier service contracts.