Mallinckrodt NELLCOR NPB-4000 Service Manual page 18

Section 3: Performance Verification
3.3.4.1.2 Heart Rate Tone Volume Control
3.3.4.1.3 Dynamic Operating Range
3-6
6. Verify the following:
a. An audible alarm remains silenced.
b. "Slashed bell" icon appears in each numeric frame on display.
c. SpO % and HEART RATE displays continue flashing.
2
d. Heart rate tone is audible.
e. Audible alarm returns in approximately 60 seconds.
1. Set up NPB-4000/C monitor and SRC-2 pulse oximeter tester as indicated in
paragraph 3.3.4.1.1.
2. Apply power to monitor and verify SpO
displayed.
3. Press Alarm Silence switch on front panel of the monitor to temporarily
silence audible alarm.
4. Verify heart rate tone source, found in Heart Rate Menu, is set to "SpO
5. Press Heart Rate Tone Volume switch on front panel of monitor.
6. Within 3 seconds of having pressed Heart Rate Tone Volume switch, rotate
knob CW and verify beeping heart rate tone sound level increases.
7. Rotate knob CCW and verify beeping heart rate tone decreases until it is no
longer audible.
8. Rotate knob CW to return beep volume to a comfortable level.
Note: Three seconds after the last switch-press or rotation of the knob, function
of the knob reverts to moving the highlight on the display screen.
The following test sequence verifies proper monitor operation over a range of
input signals.
1. Connect SRC-2 to NPB-4000/C and turn NPB-4000/C on.
2. Place SRC-2 in RCAL 63/LOCAL mode.
3. Set SRC-2 as indicated in Table 3-2. Verify NPB-4000/C readings are
within indicated tolerances. Allow monitor several seconds to stabilize
readings.
and heart rate values are correctly
2
".
2