Nellcor OxiMax N-65 Operator's Manual page 46

OXIMAX N-65 Operation
5. If the monitor detects a problem, an error tone sounds
and an error code (Er) and the error number displays.
See Troubleshooting on page 93.
6. Upon successful completion of POST, the monitor
sounds a one-second tone to indicate it has passed the
test.
40
WARNING: Ensure the speaker is clear of
any obstructions and the speaker holes are
not covered. Failure to do so could result in
an inaudible alarm tone.
Note: The POST pass tone also functions as an
audible confirmation that the speaker performs
properly.
O Max N-65 Operator's Manual
XI