Nellcor OxiMax N-550, Service Manual

Page: 23 / 138

Performance Verification
N-550 13
Note : A decimal point to the right of the value in either window display
indicates that the alarm limits are not power-on default values.
7. Press the SpO
2
Alarm Limit button two times rapidly (twice within three
seconds). Verify that the N-550 emits two beeps and that the %SpO
2
display indicates “85” for three seconds. Verify that “LO” is displayed in
the pulse rate window.
Figure 5: Adjusting Low %SpO
2
Alarm Limit
8. Press the SpO
2
Alarm Limit button two times rapidly. Within three
seconds, press and hold the Adjust Down button and verify that the
%SpO
2
display reduces to a minimum of “20.” Press and hold the Adjust
Up button and verify that the %SpO
2
display cannot be raised past the
upper alarm limit setting minus one point.
9. Turn the N-550 off by pressing the Power On/Off button.
10. Turn the N-550 on by pressing the Power On/Off button.
11. Wait for POST to be completed. The %SpO
2
and pulse rate alarm limits
will be reset to the default values.