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Technical Discussion
130
functionality. The FE-102 front end power supply for the N-595 is an isolated
switcher which generates +5 volts and ±12 volts.
The patient is connected to the N-595 via an O
cable. The SpO
analog front end drives the O
2
the incoming signal, and provides adjustable gain status. The microprocessor
measures the O
M
sensor's analog outputs and continually controls the gain
XI
AX
stages and LED drive current to ensure that the signals are within the
measurement range.
The N-595 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 buttons and five LED indicators. The buttons allow 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-595 and O
conditions. The N-595 contains a speaker for audio output.
The static RAM and the RTC for the microprocessor are powered whenever the
N-595 has power, either AC power or battery power. This allows time and certain
data to be maintained, even while the N-595 is turned off.
M
sensor and pulse oximetry
XI
AX
M
sensor's LEDs, conditions
XI
AX
and beats per minute
2
M
sensor
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