Figure 6: Adjusting High Pulse Rate Alarm Limit; Figure 7: Adjusting Low Pulse Rate Alarm Limit - Nellcor OxiMax N-550 Service Manual

Performance Verification
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12. Press the Pulse Rate Alarm Limit button. Verify that the N-550 emits a
single beep, the pulse rate display indicates an alarm limit of "170" and
that the %SpO display window shows "HI" for about 3 seconds.
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Figure 6: Adjusting High Pulse Rate Alarm Limit

13. Press the Pulse Rate Alarm Limit Button. Within 3 seconds press and hold
the Adjust Down button. Verify that the pulse rate display reduces to a
minimum of one point above the pulse rate low limit alarm setting.
14. Press the Pulse Rate Alarm Limit button two times (twice within 3
seconds). Verify that the N-550 emits two beeps and that the pulse rate
display indicates an alarm limit of "40" for 3 seconds. Verify that "LO" is
displayed in the %SpO

Figure 7: Adjusting Low Pulse Rate Alarm Limit

15. Press the Pulse Rate Alarm Limit button two times rapidly. Within 3
seconds press and hold the Adjust Down button. Verify that the pulse rate
display cannot be raised past the upper alarm limit setting minus one
point.
16. Turn the N-550 off by pressing the Power On/Off button.
17. Turn the N-550 on by pressing the Power On/Off button.
display.
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