Nellcor OxiMax N-600x Service Manual page 158

Technical Discussion
152
and shuts off the unit power supply if the battery voltage becomes too low to
support N-600x functionality. The Patient Isolated power supply for the N-600x is
an isolated switcher which generates +3.3, +5, and +12 volts. The patient is
connected to the N-600x via an O
NELL-1A oximetry module drives the O
incoming signal, and provides adjustable gain status. The oximetry module
measures the O M sensor's analog outputs and continually controls the gain
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stages and LED drive current to ensure the signals are within the measurement
range.
The monitor has a 240 x 64 liquid-crystal display (LCD) which provides various
display capabilities including numeric readouts for %SpO
(BPM) pulse rate, graphical pleth wave and pulse blip bar, menu selection
elements, and status/error messages. There is also a membrane panel consisting of
nine (9) buttons and five (5) LED indicators. The buttons enable the user to
navigate through and input menu selections using the LCD and LED interfaces.
The LED indicators provide feedback to the user on various N-600x and O
sensor conditions. The monitor contains primary and secondary speakers for
audio output.
The static RAM and the RTC for the microprocessor are powered whenever the
monitor has power, either AC power or battery power. This allows time and
certain data to be maintained, even while the monitor is turned off.
M sensor and pulse oximetry cable. The
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M sensor's LEDs, conditions the
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and beats per minute
2
M
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