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OSCAR Troubleshooting

1,114 bytes added, 19:12, 2 December 2020
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'''Description:''' OSCAR always starts from the default data folder.
<br />'''Possible fault mechanism:''' Before 1.2.0, OSCAR only allowed one import of data per a 24-hour day for ResMed machines.<br>'''Possibly expected:''' In SleepyHead one could choose a different data folder. That was taken out of OSCAR for a good reason.
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'''Solution or workaround:''' Start OSCAR with --datadir "complete address of other data folder".
The last folder will be used the next times OSCAR is started. Until this trick is done again...
Note that there are two hyphens in "--datadir", not just one.
 
== OSCAR and ResMed CPAP screen show different AHI values ==
 
'''Description:''' AHI reported by ResMed CPAP machine may differ from AHI reported by OSCAR.
<br>'''Possible fault mechanism:''' OSCAR determines length of usage more accurately than ResMed CPAP reports.
<br><br>There may be usually slight differences between the AHI reported by a ResMed CPAP machine and by OSCAR especially if there is more than one session in the night. The machine reading can be higher or lower than what OSCAR reports. This is caused by a difference in the way the machine and OSCAR compute the length of time the machine was in use.
 
ResMed CPAP machines round the length of each session to the nearest minute, then adds those together to get the total minutes for the night. OSCAR doesn't round the session lengths and thus computes the total time for the night in seconds. AHI is calculated as # events/total time, so OSCAR and the machine are using a slightly different denominator for total time.
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