Figure 3-7: Alarm Silence Duration - Nellcor NPB-190 Service Manual

Section 3: Performance Verification
3-6
a. The pulse blip bar begins to track the artificial pulse signal from the
SRC-2.
b. The pulse tone is heard.
c. Zeroes are displayed in the %SpO
d. After about 10 to 20 seconds, the monitor displays oxygen saturation
and pulse rate as specified by the tester. Verify that the values are
within the following tolerances:
Oxygen Saturation Range 79% to 83%
Pulse Rate Range 37 to 39 bpm
e. The audible alarm sounds and both the %SpO
flash. This is an indication that both parameters have violated the
default alarm limits.
5. Press and hold the Alarm Silence button on the front of the monitor for less
than 3 seconds. Verify that the pulse rate display indicates "SEC" and the
%SpO display indicates "60" while the Alarm Silence button is pressed.
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The alarm is silenced when the button is released.

Figure 3-7: Alarm Silence Duration

6. Release the Alarm Silence button. Verify the following:
a. The alarm remains silenced.
b. The Alarm Silence indicator lights.
c. The %SpO and pulse rate displays resume flashing.
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d. The pulse tone is still audible.
e. The audible alarm returns after approximately 60 seconds.
7. While pressing the Alarm Silence button, press the Adjust Down button
until the %SpO display indicates "30". Press the Adjust Up button and
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verify that the displays indicate 60 SEC, 90 SEC, 120 SEC, and OFF.
Release the button when the display indicates "OFF". Press the Alarm
Silence button again and verify that the Alarm Silence indicator flashes.
8. Wait approximately 3 minutes. Verify that the alarm does not return. After 3
minutes ± 10 seconds, the alarm silence reminder beeps three times, and
continues to do so at 3-minute intervals.
and pulse rate displays.
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and pulse rate displays
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