Revision C 250cx Series Maternal/Fetal Monitor 5-9
2036946-001
Fetal Heart Rate Monitoring: Fetal Heart Rate Alarms
100% Signal Loss
In cases where there is a complete absence of signal, the signal quality time-to-alarm
is 1.25 minutes.
100% Signal Loss Example
Intermittent Signal Loss
In the clinical environment, a partial loss of signal is seen more frequently than a
complete loss of signal. The time-to-alarm will vary related to the percentage of
signal loss. Figure below shows an example where there is 70% signal loss resulting
in a signal quality alarm after 5 minutes.
70% Signal Loss Example
Silencing an Audio Alarm
Press the Alarm Silence button to cancel the audio component of an alarm; the
visual indications remain until the alarm condition is resolved.
The silence function works on an alarm-by-alarm basis. An audio alarm will sound
if a new alarm condition occurs after the previous condition has been resolved.
FHR (bpm)
alarm activated
Time (minutes)
100% signal loss
1.25 min
FHR (bpm)
alarm activates
Time (minutes)
70% signal loss
end of “good”
quality signal
5 min
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