Covidien Nellcor OxiMax N-600x Operator's Manual page 55

Using the Monitor
For a sensor containing data, the message identifies the sensor
data type. For a blank sensor, the message identifies the monitor's
current data type setting used to write data to the sensor. The
data type settings are SpO and SPO +BPM.
2 2
Note:The type of data recorded is only displayed when data is
present in the O M sensor.
XI AX
The monitor displays zeros in the %SpO and Pulse Rate displays
2
while the N-600x is searching for a valid pulse. For optimal
performance, allow the monitor to search and lock onto a pulse
for approximately 5 to 10 seconds.
When a valid pulse is detected, the monitor enters the
Monitoring Mode and displays patient parameters.
N-600x Operator's Manual 47