Welch Allyn Propaq Encore, Руководство по обслуживанию

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114 Technical Overview Welch Allyn Propaq Encore Vital Signs Monitor
Isolated Circuitry. The Isolated Circuitry directly controls the hardware responsible for
the CO
2
measurement function.
CPU Circuitry. The CPU Circuitry includes the Philips 80C552 micro controller, 32K of
RAM, 64K of ROM, and standard RESET circuitry.
A UART directly interfaces with the pulse oximetry SpO
2
board providing the SpO
2
measurement function.
The CO
2
and SpO
2
functions are isolated from all other subsystems in the Propaq Encore
or Expansion modules, but not from each other.
co2 block
IPC Expansion
The Inter-processor Communications (IPC) bus, originating in the Propaq Encore, is
passed to the MSP board from the expansion connector. The two-wire bus is expanded to
the printer and to the Main Stream Processor via opto-couplers.
Power Distribution System
Power for CO
2
and SpO
2
circuit operations is derived solely from the expansion
Connector. The principal supply comes from the Propaq Encore battery connections and
an on-board switching power supply.
CO
2
Analysis Chamber (Bench)
Analysis of the expired CO
2
occurs in the bench. The bench is located in the mainstream
sensor for MCO
2
or on the sidestream stick board for SCO
2
.
In mainstream applications, the sensor mounts over, and connects to, a disposable airway
adapter (cuvette) through which the patient’s exhaled gases flow. In sidestream
PRINTER
I/F CONN.
EXP.
#1 CONN.
EXP.
#2 CONN.
SPEAKER
I/F CIRC.
NON-ISO
POWER
IPC EXP.
CIRC.
ISO PWR
TRANS.
OPTO
COUPL.
OPTO
COUPL.
ISO PWR
SUPPLY
SPO2
I/F CIRC.
SPO2
XDUCER
AND
CONN.
MSP NON-ISOLATED CIRCUITRY
SSP NON-ISOLATED CIRCUITRY
MSP ISOLATED CIRCUITRY
CAPNOGRAPHY FUNCTIONAL BLOCK DIAGRAM
1097-13
PUMP
CONTROL
SIDE-
STREAM
STICK
PCB CPU
A/D
CONV.
&
MULTIPLEX
CONTROL
INFRARED
SOURCE
DETECTOR
CONTROL
MOTOR
DRIVE
MOTOR
SENSE
(POSITION)
PRESSURE
SENSORS &
AMPLIFIERS
WATER
TRAP
DETECTOR
PUMP
FILTER
PUMP
(Pneumatic connections
not shown.)
NELLCOR
SPO2
BOARD
CPU
A-D
CONV.
INFRARED
SOURCE
DET.
BIAS
CIRC.
HEATER
CIRC.
MOTOR
DRIVE
POSN.
SENSE
DET.
SIGNAL
DET.
TEMP.
BARO.
CO2
SENSOR
AND
CONN.
EXTENDER
BOARD
CO2 SIGNAL
TEMPERATURE