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E331.E2501 .061 21.02.02
System SIRECUST 1280/1281
Bedside Monitor - Service Manual
3.
INTERNAL
MONITOR
FUNCTIONS
3.1.
Introduction
Sensors develop electrical signal analogs
for
a
variety
of
patient
vital
signs
(physiological
functions).
The
electrical
signals are digitized and converted into
infrared
signals
by specialized
physio-
logical
parameter
cartridges,
and
conveyed
via
SIREM
units
(refer
to
Section
3.20.)
to
the
input
circuits
contained
on
the
Front
End
Board
in
SIRECUST
1280/1281
monitors.
Sub-
systems within the monitors process the
signals to develop visual displays of the
information contained in the signals. The
monitor sub-systems
also initiate visual
and
audible
alarms when
indicators of
patient
vital signs
are
outside
of pre-
defined limits, and provide digital as well
as analog electrical signal outputs for use
with equipment external to the monitor.
Basically,
then,
monitors
have
three
functional sub-systems -- processing and
display of information relative to patient
vital signs, provision for human control of
monitor
operations,
and
a
system
for
supplying power to all circuits. Figure 3-1
is a block diagram illustrating the basic
system
functions,
and
depicts,
in part,
which
boards
form
each
of the three
basic sub-systems.
Figure 3-2 illustrates
the interconnection of boards and system
components in the monitors.
PARAMETER
DATA PROCESSING
Z-AMP
INPUT SIGNALS P)
SIREM
FRONTEND
DISPLAY PROCESSOR
DEFLECTION
MEMORY EXTENSION
CURVE
OPERATION INTERFACE
HIGH FREQ, TONE
LOW
FREQ. TONE
TWO TONE ALARM
AUDIBLE ALARM
CURVE (COMM)
VISUAL OUTPUT CONTROL
CRT SCREEN
CONTROL INPUT SIGNALS
CARDIAC
OUTPUT
——
FRONT END
FOOT SWITCH
AC POWER INPUT
i
»
POWER
SUPPLY
DC POWER
TOALL CIRCUTS
TO CENTRAL STATION
TO RECORDERS
ANALOG SIGNALS
ELECTRICAL SIGNAL
|
OUTPUT CONTROL
CURVE (COMM)
ANALOG OPTION
MASTER OPTION
PA
AS232
Figure 3-1.
SIRECUST 1280/1281 Monitors: Basic Block Diagram
Page 3 - 1
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