Nellcor OxiMax N-550, Service Manual

Page: 22 / 138

Performance Verification
12
Note : In addition to serving as the POST pass verification, the POST pass
tone also functions as an audible confirmation that the speaker is
performing properly. If the speaker does not function, the alarm
sounds cannot be heard.
Power-On Defaults and Alarm Limit Ranges
See Figure 3 on page 9 for the location of the N-550 controls.
Note : When observing or changing default limits, a three-second time-out is
in effect. That is, if no action is taken within three seconds, the N-550
automatically returns to the normal mode.
1. Turn the N-550 on by pressing the Power On/Off button.
2. Wait for POST to be completed.
3. Press and release the SpO
2
Alarm Limit button.
4. Verify that the N-550 emits a single beep and the %SpO
2
display indicates
an upper alarm limit of “100” for about three seconds.
5. Verify that “HI” is displayed in the pulse rate display.
Note : “HI” in the display window indicates an upper alarm limit that is
being adjusted, and a “LO” in the window indicates that a low alarm
limit is being adjusted.
Figure 4: Adjusting High %SpO
2
Alarm Limit
6. Press the SpO
2
Alarm Limit button. Within 3 seconds, press and hold the
Adjust Down button. Verify that the %SpO
2
display reduces to a
minimum of one point above the %SpO
2
low alarm limits setting.