Covidien Nellcor OxiMax N-600x Operator's Manual page 56

Using the Monitor
48
Notice the movement of the blip bar or plethysmographic
waveform or beating heart indicating the monitor is displaying
real-time data. Listen for the pulse beep tone. If the pulse beep
tone does not sound with each pulse, it is an indication the pulse
beep volume is set to zero, the speaker is malfunctioning, or the
signal is corrupt.
When an O M sensor is attached to the monitor and applied to
XI AX
a patient, the monitor may lose a pulse signal. If a pulse signal is
lost, an alarm sounds and a poor signal condition message
displays on the monitor screen. At this point, the monitor displays
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(3 dashes / 3 dashes) and remains in the Pulse Search Mode for
five seconds before displaying the poor signal condition screen.
The poor signal condition screen is part of the N-600x's Sensor
Messages feature. For more information about O
Messages, refer to OXIMAX Sensor Messages on page 66.
M Sensor
XI AX
N-600x Operator's Manual