GE Dash 3000 Service Manual page 40

2-20
Equipment overview: Theory of operation
The DAS block diagram with generic Ohmeda SPO2 consists of the
following three sections.
Section
ECG/Respiration Separately isolated section includes a 7.3728MHz 68HSC05
microcontroller, A/D conversion, signal processing hybrids and
DC-DC isolation converter.
Main DAS Separately isolated section includes a 22.1184MHz 68332
microcontroller with FLASH and SRAM memory, A/D conversion,
signal processing hybrids and DC isolation converter.
Non-Isolated Includes serial and parallel host interfaces and NBP pump, valves,
circuits and over-pressure circuitry.
ECG
The ECG function detects heartbeats and arrhythmias, measures heart
rate (HR) and ST segment deviation, and generates a 12SL diagnostic
interpretation. Patient alarms with adjustable high and low limits for
HR and ST segment deviation are provided. Additional patient alarms
are provided for arrhythmias and PVCs. System alarms for individual
lead failure and all leads failure are provided.
The patient monitor accepts the green 3, 5, and 10-leadwire Multi-link
ECG connectors (compatible with Eagle 3000 monitor, Eagle 4000
monitor, and Tram modules).
Respiration
The respiration function measures respiration rate (RR) and detects
apnea through the ECG leadwires using the impedance variation
technique. Patient alarms for RR (with adjustable high and low limits)
and apnea (with adjustable time limit) are provided. System alarms for
lead failure, cardiac artifact, and learning are provided.
Generic Ohmeda pulse oximetry (SpO
The pulse oximetry function measures arterial oxygen saturation (SpO
and peripheral pulse rate (PPR). Patient alarms with adjustable high
and low limits for SpO
2
off patient, low-quality signal, and pulse search are provided.
The patient monitor accepts the blue color-coded pulse oximetry
connector (compatible with Eagle 3000 monitor, Eagle 4000 monitor, and
the Tram x50-series modules). The patient monitor with Generic
Ohmeda SPO2 supports Nellcor probes.
Dash 3000/4000/5000
Description
2
and PPR are provided. System alarms for probe
)
2
2000966-542D
)