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Service Manual
Monitoring electronics system description
The monitoring electronics reside on the Analog and Digital Boards located in the front
chassis assembly. Refer to the figures
These circuits:
•
acquire the physiological signals from coupling devices (electrodes, transducers, and
probes)
•
convert the analog signal to digital data
•
process the data for display and alarm monitoring
•
display the data and any alarm conditions
•
transmits the analog ECG signal across the isolation barrier for real-time analog ECG
output
Isolation barriers on the Analog and Digital Boards isolate the circuits connected to the
patient from circuits connected to other devices including the monitor's power input.
Communications and power delivery across the isolation barrier are achieved using opto-
couplers and a transformer rated for medical applications.
Microcontrollers (μCs) control patient data processing, alarm monitoring and display.
monitoring system diagram
5-LEAD
ECG CABLE
CUFF
PRESSURE
TRANSDUCER
CABLES
TEMPERATURE
CABLES
ECG LEAD SELECT
PACER/ (TO DAP)
ECG
VLF (LEAD FAULT)
ACQUISITION
ECG/RESP
BANDPASS
C LA RA LL
&
ECG1 &
OFFSET
ECG2
COMPENSATION
(ECG: 0.5-40 HZ
RESP
RESP
OR 0.05-40 HZ)
ACQUISITION
RESP_LS
RESP ENBL
NIBP
ACQUISITION
TRANS. PWR.
IBP
ACQUISITION
IBP CHANNEL SELECT
TEMPERATURE
ACQUISITION
ACQUISITION
INPUT
CONTROL:
TEMP CHANNEL SELECT
TO ACQUISITION
CIRCUITRY
page
113,
page 114
and
MONITORING ELECTRONICS
SYSTEM DIAGRAM
RESTORE CONTROL
(FROM DAP)
OFFSET COMPENSATION
DATA (FROM DAP)
VECG1
VECG2
VRESP
PATIENT
VPRS
DATA
MULTIPLEX
VOSC
VINV
VYSI
DATA
ACQUISITION
PROCESSOR
(DAP)
&
SUPPORTING
CIRCUITS
Technical overview
page
115.
REAL-TIME
TO
ECG OUT
ECG OUT
OPTO-
CONNECTOR
COUPLERS
TO/FROM
DIGITAL
BOARD
SYNC OUT/
MARKER IN
TXD/RXD
OPTOCO UPLERS
113
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