Mallinckrodt NPB-190 Manuel de l'opérateur télécharger pdf (Page 45)

Start-Up and Use

Alarm Silence Reminder

The alarm silence reminder (three beeps) sounds at least every 3

minutes while the alarm silence duration is set to OFF.

The alarm silence reminder may also be disabled by service

personnel using the procedures described in the service manual.

The factory default is that the reminder is enabled.

Adjusting Audible Alarm Volume

To view the current volume of the audible alarm, press and hold

the Alarm Silence button for more than 3 seconds, without

touching any other buttons. The display will show the current

volume level, as shown:

To adjust the audible alarm volume, while viewing the current

alarm volume, press the Adjust Up or Adjust Down button to set

the volume level within a volume range of 1 (lowest volume

setting) to 10 (highest volume setting). The alarm volume cannot

be set to zero.

The audible alarm can only be silenced using the Alarm Silence

button, as discussed earlier in this section.

Management of Loss-of-Pulse Alarm

The NPB-290 signal processing is designed to reduce the adverse

effects of normal interference associated with motion, low patient

perfusion, and spurious electrical or optical signals. Figure 7

illustrates monitor response in sporadic or lost pulse situations

with and without continuous motion.

Losing the pulse presents an alarm-management challenge for any

oximeter—sometimes it is caused by a clinical emergency,

sometimes by signal distortion. When the pulse is lost because of

deteriorating patient condition, the oximeter should alarm

quickly. However, normal interference can obscure the pulsatile

signal. If interference is short-lived, no alarm sounds. Such

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Mallinckrodt NPB-190 Manuel de l'opérateur Page 45