User's Manual

4-3
Figure 4-3. The ECG SCALE Sub-Menu
c. SCALE. Selecting this menu option allows the selection of the scale for the ECG
waveform(s). The options are AUTO, 1, 5, 10, 15 (default), 20, 25, 30, and 40 mm/mv
(See Figure 4-3). The selected scale appears on the right hand side of this menu option.
If AUTO is selected, a scale is picked that would make the current waveform(s) fill the
ECG viewing area. This scale will be in effect until another scale is selected (AUTO or
any other selection). A Scale Indicator associated with the Trace is displayed on the left
side of the screen, and denotes a 1 millivolt signal amplitude.
(1) If the scale of the ECG trace is so large that the top or bottom of the ECG
waveform is distorted or flattened, the “OVERSCALE” message flashes in
the ECG waveform area. This message will override other ECG error
messages. Use the SCALE menu option (in the ECG Menu) to resize the
waveform until the “OVERSCALE” message stops flashing. If this continues,
the Auto Scale option should be selected to prevent further waveform
distortion.
(2) The ECG waveform in may be frozen for closer examination by pressing the
FREEZE control key. When the waveform is frozen, it is displayed below
Trace A with a “Blue Box” around it. While Freeze is enabled, changes to the
Parameter Selections are not allowed; if the operator tries to access the
PARAMETER SELECTION menu, a WARNING Box appears to alert the
operator that the selected menu may not be accessed.
d. HR SOURCE. Selecting this menu option allows the selection of the source to be used
for the heart-rate display in TRACE A area. The options are AUTO, ECG (default),
ART, SPO2 and NIBP (See Figure 4-4).
NOTE
Invasive Pressure is not available with this system. If ART is selected as the HR SOURCE a
Warning box appears that informs the operator that this option is not available.