Covidien Nellcor OxiMax N-600x Operator's Manual page 52

Using the Monitor
44
each time the N-600x is turned on as described in the following
procedure.
Caution: If any indicator or display element does not light
when the pulse oximeter is turned on, do not use the pulse
oximeter. Instead, contact qualified service personnel, your
local Nellcor representative, or Nellcor's Technical Services
Department.
Note: Physiological conditions, medical procedures, or external
agents that may interfere with the monitor's ability to detect and
display measurements, include dysfunctional hemoglobin, arterial
dyes, low perfusion, dark pigment, and externally applied
coloring agents such as nail polish, dye, or pigmented cream.
Note: The monitor automatically launches the Power-On Self-Test
(POST), which tests the monitor circuitry and functions.
Caution: During POST (immediately after power-up),
confirm that all indicators light, all display segments turn
on, and the pulse oximeter speaker sounds a sequence of
three ascending tones. After the POST process complete,
verify that a single one-second tone sounds.
1. Turn on the monitor by pressing the ON/STANDBY button.
2. Ensure all of the front panel indicators illuminate.
N-600x Operator's Manual