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M
E331.E2501.061.21.02.02
System SIRECUST 1280/1281
Bedside Monitor - Service Manual
back ON.
Except for the -5 V,, output,
'which
has
its own
current sensor,
over-
current protection is provided for the Voc
output voltages through a sensor in the
+15 Уж
supply
line
to
the
auxiliary
inverter. An overcurrent condition in any
of the -V,, supplies causes the sensor to
generate a signal to V33.
The ac output from T1 used to control the
auxiliary inverter is also used as input to
a voltage sensing circuit that generates
the signal, AC INTO. The circuit becomes
active if the input voltage drops to less
than 90V,,/180V,,, and informs the CPU
of imminent line failure so that information
can be stored and not lost because of
power failure.
lt sends a signal to V34, if
the
input
voltage
drops
to
less
than
8B0V,./160V,., to power-down the supply.
3.9.
Monitor Display
SIRECUST
1280/1281
monitors
incorp-
orate a 12-inch CRT display that provides
up to 8 channels for waveforms
or for
one EKG waveform and 7 trend channels. .
Physiological
data
waveforms
require
sharp
crisp
displays
that
show
the
necessary diagnostic features of patients
physiological
vital signs,
and
also
the
capability to display various calculated or
derived alphanumeric data.
Two
display
techniques
have
been
incorporated
in
SIRECUST
1280/1281
monitors to optimally support these needs
with a high fidelity physiological display.
Refer to Figure 3-16.
The
XYZ
display
function
draws
the
waveform
as
a
continuous
line
on
the
screen.
The
raster
display
function
allows
the
display of any letter, symbol, or graphics
at any
position
on
the
screen.
See
Figure 3-17.
STAND-ALONE
RECGOB
FOUND
,
j
PRINT
SCREEN
FINISHED
BED-SA
„2i-JAN-1990
18: "ms
1mV
ee
O
141:
51 a
IHR
57% S9
RR
μα й
AP
( 86)
й
NOA
SNL NS Na
se
Figure 3-16.
Oo Typical Waveform Screen
Page 3 - 25
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