Pulse Oximetry Subsystem Features; Pulse Tone - Nellcor N-200 Operator's Manual

Guide to Operation
6. Turn on the N-200 using the ON/STDBY switch. After a
few seconds, following successful completion of the self-
test, measurements are displayed.
A beep signals each pulse beat, and its pitch increases and
decreases to reflect changes in SpO
signal is lost and pulse is measured only from the ECG, the
pulse tone changes from a beep to a warble.
7. Check the alarm limits each time the N-200 is used by
sequentially pressing the HIGH SAT, LOW SAT, HIGH
RATE, and LOW RATE buttons.
8. Adjust the alarm limits if necessary. Press and hold the
appropriate alarm button, and turn the control knob until
the desired value is displayed. SpO
set from 20% to 100%. Pulse rate alarm limits may be set
from 20 to 250 beats per minute. The upper limit must be
higher than the lower limit.
Note:

PULSE OXIMETRY SUBSYSTEM FEATURES

The pulse oximetry subsystem of the N-200 measures and
displays SpO
for the trend memory.

Pulse Tone

When a NELLCOR sensor is connected to the N-200 and a
patient, the pulse beat is signaled by a beep that varies in pitch
to reflect changes in oxygen saturation, rising as saturation
increases and falling as it decreases.
When the N-200 is receiving only an ECG-derived signal (no
sensor-derived optical signal), each detected R-wave is signaled
by a high-pitched tone that has a slight warble. This tone is
distinct from any beep heard when a sensor-derived signal is
present. The pitch of the warbling tone that accompanies an
ECG-derived signal is not related to oxygen saturation.
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When the N-200 is turned off and back on, all
operator-adjustable features return to their
default state.
and pulse rate, and provides data for alarms and
2
If the oximetry pulse
.
2
alarm limits may be
2