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REAL-TIME TRACE MONITOR
Pressing the "TRACE" key calls up a real-time
trace display on the right-hand display screen
(Figure 31). The display is capable of presenting
two simultaneous traces from a choice of up to
eight signals. Depending on monitor options, the
choices may be: CO
Enflurane, Isoflurane, expiratory flow rate,
breathing
pressure,
waveform.
Selection Keys
The three left-most keys are used to select which
signals are to be displayed in the upper and
lower traces. The key immediately to the right of
the "ENTER" key corresponds to the upper trace
display, and the second key to the right of the
"ENTER" key corresponds to the lower trace. A
selection is made by stepping through the
available choices displayed sequentially directly
above the key. Pressing the "ENTER" key while
the selected choice is displayed will put the
selection into effect and alter the display
accordingly. If the "ENTER" key is not pressed
within a short time, the display window above
the key will be relabeled with the current trace.
Sweep Speed Control
The second key from the right controls the
sweep speed for both waveform displays.
, N
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2
2
and
pulse
oximeter
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MONITORING SYSTEM (continued)
Successive keystrokes will toggle the sweep
speed selection between "SLOW" (16 seconds)
and "FAST" (8 seconds). The currently selected
sweep speed selection is displayed against an il-
luminated background in the window directly
above the sweep speed selection key. The
unselected sweep speed is displayed against a
dark background.
Waveform Sweep/Freeze Control
The right-most key freezes the display after the
completion of the current sweep. Successive
keystrokes will alternately freeze and unfreeze
the display. The current display sweep/freeze
state is identified against an illuminated back-
ground in the window directly above the
sweep/freeze control key. The unselected
sweep/freeze selection is displayed against a dark
background. When in the sweep mode, a gap in
the trace represents the division between the
previous sweep and the current sweep.
Automatic Scaling
The Real-Time Trace Display calculates the
average
peak
measurement
automatically selects the appropriate vertical
axis scaling. This feature ensures maximum use
of the display's full resolution and reduces the
amount of over-range displays.
and
then
51
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