Nellcor OXIMAX N-600X Series, Руководство по обслуживанию

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Power
Service Manual
10030881 Rev. B 12-2008
47
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Analog outputs
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Sound generation by generating the appropriate volume and frequency control settings
for the speaker circuitry
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Monitoring and controlling oximeter power
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Communicating with the real-time clock (RTC) and
electrically-erasable-programmable-read-only-memory (EEPROM)
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Trend data collection and storage
Static random access memory (RAM) and FLASH read-only memory (ROM) are
provided for the microprocessor on the PCB. The system monitor resets the entire
PCB if the +3.3 volts is out of tolerance or the watchdog timer is not periodically reset
by the software.
Note:
The static RAM and the RTC for the microprocessor are powered whenever the oximeter has
power, either AC power or battery power. This allows time and certain data to be maintained,
even while the oximeter is turned off.
The NELL-1A is electrically isolated to reduce capacitive coupling to earth ground
and improve the NELL-1A’s ability to read difficult patient data.
User Interface (UIF)
The oximeter has a 240 x 64 liquid crystal display (LCD) which provides various
display capabilities including numeric readouts for SpO
2
and beats per minute (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 OxiMax N-600x pulse oximeter and OxiMax pulse
oximetry sensor conditions. The oximeter contains primary and secondary speakers
for audio output.
Power
Power is supplied to the OxiMax N-600x pulse oximeter either from an AC
connection (100-120 or 200-240 VAC) or from a 6-volt, 4 ampere-hour battery. The
transition between power sources is invisible to the user, from AC power to battery
power or from battery power to AC power. Power can remain active during cases
where AC power is lost or applied.
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The LPS microcontroller monitors the battery voltage and shuts off the unit power supply
if the battery voltage becomes too low to support OxiMax N-600x pulse oximeter
functionality.
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The patient isolated power supply for the OxiMax N-600x pulse oximeter is an isolated
switcher which gen3.3, +5, and +12 volts.