Nellcor OXIMAX N-600X Series Service Manual page 23

Oximeter Features
monitors both degree and duration of desaturation as an index of desaturation
severity. Thus, the SatSeconds feature helps distinguish clinically significant events
from minor and brief desaturations that may result in nuisance alarms.
Figure 5. First Event: No SatSeconds Alarm
10030881 Rev. B 12-2008
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Service Manual