Philips M3921A Service Manual page 27

Heart Rate Tone
Volume Control
Performance Verification
indicates zero or is blank. The pulse bar can occasionally indicate a step change
as the monitor is in the pulse search mode.
5. Move the modulation switch on the SRC-2 to LOW.
6. Verify the following monitor reaction:
a. The pulse bar begins to track the artificial pulse signal from the SRC-2.
b. Initially, zero is displayed in the SpO
c. After about 10 to 20 seconds, the monitor displays saturation and heart rate
as specified by the tester. Verify that the values are within the following
tolerances:
Oxygen Saturation Range 79% to 83%
Heart Rate Range 35 to 41 bpm
d. The audible alarm sounds and both the SpO
flash, indicating both parameters have violated the default alarm limits.
e. The heart rate tone is heard. For this test, the user should set the heart rate
tone source to SpO
7. Press the ALARM SILENCE button
The audible alarm is temporarily silenced.
8. Verify the following:
a. The audible alarm remains silenced.
b. The slashed bell icon appears in each numeric frame on the display.
c. The SpO % and
2
d. The heart rate tone remains audible.
e. The audible alarm returns in approximately 60 seconds.
1. Connect the SRC-2 pulse oximeter tester to the M4787A sensor cable and
connect the cable to the monitor.
2. Set SRC-2 as follows:
SWITCH
RATE
LIGHT
MODULATION
RCAL/MODE
frame, or it is blank.
2
from the Heart Rate Menu.
2
HEART RATE
displays continue flashing.
POSITION
A1
38
LOW
LOW
RCAL 63/LOCAL
Hardware and Software Tests
% and HEART RATE displays
2
on the front panel of the monitor.
A3
38
LOW
OFF
RCAL 63/LOCAL
15