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M3500B/M5500B Service Manual
ECG Monitoring Functions
There are two separate ECG front ends - one for signals coming in on the pads
cable, and one for signals coming in on the 3- or 5-lead ECG cable.
ECG - Pads
The ECG signal picked up by the disposable defibrillation pads is carried by
the pads cable to the pads connector, and then to the Power PCA. There it is
amplified, filtered, digitized and passed across a patient isolation barrier
before being passed to the Control PCA via a large ribbon cable.
The Control PCA then performs digital signal processing on the ECG data,
and is responsible for
ECG waveform analysis and Shock Advisory (in AED Mode).
Formatting and presenting the ECG to the display and to the printer.
Counting heart rate and generating heart rate alarms.
Reporting on the status of the patient connection.
ECG - 3/5-lead cable
The ECG signal picked up by the ECG monitoring electrodes is carried by the
ECG cable to the ECG connector, and then to the Interface PCA. There it is
amplified, filtered, and digitized before being passed to the Control PCA via a
large ribbon cable.
The Control PCA then performs digital signal processing on the ECG data,
and is responsible for
Formatting and presenting the ECG to the display and to the printer.
Counting heart rate and generating heart rate alarms.
Reporting on the status of the patient connection, and alerting the user
to measurement problems.
System Functional Descriptions
6-7
6
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